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Prof. SAKR Soulaiman
Agrocampus Ouest

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0 Plant Physiology
0 transcription factor
0 Sugar transport
0 plant architecture
0 crosstalk sugar and hormones

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Sugar transport
transcription factor

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Regular article
Published: 28 April 2021 in New Phytologist
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Plant architecture is controlled by several endogenous signals including hormones and sugars. However, only little is known about the nature and roles of the sugar signalling pathways in this process. Here we test whether the sugar signalling pathway mediated by HEXOKINASE1 (HXK1) is involved in the control of shoot branching. To test the involvement of HXK1 in shoot branching and in the hormonal network controlling this process, we modulated the HXK1 pathway using physiological and genetic approaches in rose, pea and arabidopsis. Mannose‐induced HXK signalling triggered bud outgrowth in rose and pea. In arabidopsis, both HXK1 deficiency and defoliation led to decreased shoot branching and conferred hypersensitivity to auxin. Complementation of the HXK1 knockout mutant gin2 with a catalytically inactive HXK1, restored shoot branching to the wild‐type level. HXK1‐deficient plants displayed decreased cytokinin levels and increased expression of MAX2, which is required for strigolactone signalling. The branching phenotype of HXK1‐deficient plants could be partly restored by cytokinin treatment and strigolactone deficiency could override the negative impact of HXK1 deficiency on shoot branching. Our observations demonstrate that HXK1 signalling contributes to the regulation of shoot branching and interacts with hormones to modulate plant architecture.

ACS Style

Francois F. Barbier; Da Cao; Franziska Fichtner; Christoph Weiste; Maria‐Dolores Perez‐Garcia; Mathieu Caradeuc; José Le Gourrierec; Soulaiman Sakr; Christine A. Beveridge. HEXOKINASE1 signalling promotes shoot branching and interacts with cytokinin and strigolactone pathways. New Phytologist 2021, 231, 1088 -1104.

AMA Style

Francois F. Barbier, Da Cao, Franziska Fichtner, Christoph Weiste, Maria‐Dolores Perez‐Garcia, Mathieu Caradeuc, José Le Gourrierec, Soulaiman Sakr, Christine A. Beveridge. HEXOKINASE1 signalling promotes shoot branching and interacts with cytokinin and strigolactone pathways. New Phytologist. 2021; 231 (3):1088-1104.

Chicago/Turabian Style

Francois F. Barbier; Da Cao; Franziska Fichtner; Christoph Weiste; Maria‐Dolores Perez‐Garcia; Mathieu Caradeuc; José Le Gourrierec; Soulaiman Sakr; Christine A. Beveridge. 2021. "HEXOKINASE1 signalling promotes shoot branching and interacts with cytokinin and strigolactone pathways." New Phytologist 231, no. 3: 1088-1104.

Accepted manuscript
Published: 05 February 2021 in Journal of Experimental Botany
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Shoot branching is a pivotal process during plant growth and development, and is antagonistically orchestrated by auxin and sugars. In contrast to extensive investigations on hormonal regulatory networks, our current knowledge on the role of sugar signalling pathways in bud outgrowth is scarce. Based on a comprehensive stepwise strategy, we investigated the role of glycolysis/the tricarboxylic acid (TCA) cycle and the oxidative pentose phosphate pathway (OPPP) in the control of bud outgrowth. We demonstrated that these pathways are necessary for bud outgrowth promotion upon plant decapitation and in response to sugar availability. They are also targets of the antagonistic crosstalk between auxin and sugar availability. The two pathways act synergistically to down-regulate the expression of BRC1, a conserved inhibitor of shoot branching. Using Rosa calluses stably transformed with GFP-fused promoter sequences of RhBRC1 (pRhBRC1), glycolysis/TCA cycle and the OPPP were found to repress the transcriptional activity of pRhBRC1 cooperatively. Glycolysis/TCA cycle- and OPPP-dependent regulations involve the –1973/–1611 bp and –1206/–709 bp regions of pRhBRC1, respectively. Our findings indicate that glycolysis/TCA cycle and the OPPP are integrative parts of shoot branching control and can link endogenous factors to the developmental programme of bud outgrowth, likely through two distinct mechanisms.

ACS Style

Ming Wang; Maria-Dolores Pérez-Garcia; Jean-Michel Davière; François Barbier; Laurent Ogé; José Gentilhomme; Linda Voisine; Thomas Péron; Alexandra Launay-Avon; Gilles Clément; Nicolas Baumberger; Sandrine Balzergue; David Macherel; Philippe Grappin; Jessica Bertheloot; Patrick Achard; Latifa Hamama; Soulaiman Sakr. Outgrowth of the axillary bud in rose is controlled by sugar metabolism and signalling. Journal of Experimental Botany 2021, 72, 3044 -3060.

AMA Style

Ming Wang, Maria-Dolores Pérez-Garcia, Jean-Michel Davière, François Barbier, Laurent Ogé, José Gentilhomme, Linda Voisine, Thomas Péron, Alexandra Launay-Avon, Gilles Clément, Nicolas Baumberger, Sandrine Balzergue, David Macherel, Philippe Grappin, Jessica Bertheloot, Patrick Achard, Latifa Hamama, Soulaiman Sakr. Outgrowth of the axillary bud in rose is controlled by sugar metabolism and signalling. Journal of Experimental Botany. 2021; 72 (8):3044-3060.

Chicago/Turabian Style

Ming Wang; Maria-Dolores Pérez-Garcia; Jean-Michel Davière; François Barbier; Laurent Ogé; José Gentilhomme; Linda Voisine; Thomas Péron; Alexandra Launay-Avon; Gilles Clément; Nicolas Baumberger; Sandrine Balzergue; David Macherel; Philippe Grappin; Jessica Bertheloot; Patrick Achard; Latifa Hamama; Soulaiman Sakr. 2021. "Outgrowth of the axillary bud in rose is controlled by sugar metabolism and signalling." Journal of Experimental Botany 72, no. 8: 3044-3060.

Review
Published: 28 January 2021 in International Journal of Molecular Sciences
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Plants adjust their growth and development through a sophisticated regulatory system integrating endogenous and exogenous cues. Many of them rely on intricate crosstalk between nutrients and hormones, an effective way of coupling nutritional and developmental information and ensuring plant survival. Sugars in their different forms such as sucrose, glucose, fructose and trehalose-6-P and the hormone family of cytokinins (CKs) are major regulators of the shoot and root functioning throughout the plant life cycle. While their individual roles have been extensively investigated, their combined effects have unexpectedly received little attention, resulting in many gaps in current knowledge. The present review provides an overview of the relationship between sugars and CKs signaling in the main developmental transition during the plant lifecycle, including seed development, germination, seedling establishment, root and shoot branching, leaf senescence, and flowering. These new insights highlight the diversity and the complexity of the crosstalk between sugars and CKs and raise several questions that will open onto further investigations of these regulation networks orchestrating plant growth and development.

ACS Style

Ming Wang; José Le Gourrierec; Fuchao Jiao; Sabine Demotes-Mainard; Maria-Dolores Perez-Garcia; Laurent Ogé; Latifa Hamama; Laurent Crespel; Jessica Bertheloot; Jingtang Chen; Philippe Grappin; Soulaiman Sakr. Convergence and Divergence of Sugar and Cytokinin Signaling in Plant Development. International Journal of Molecular Sciences 2021, 22, 1282 .

AMA Style

Ming Wang, José Le Gourrierec, Fuchao Jiao, Sabine Demotes-Mainard, Maria-Dolores Perez-Garcia, Laurent Ogé, Latifa Hamama, Laurent Crespel, Jessica Bertheloot, Jingtang Chen, Philippe Grappin, Soulaiman Sakr. Convergence and Divergence of Sugar and Cytokinin Signaling in Plant Development. International Journal of Molecular Sciences. 2021; 22 (3):1282.

Chicago/Turabian Style

Ming Wang; José Le Gourrierec; Fuchao Jiao; Sabine Demotes-Mainard; Maria-Dolores Perez-Garcia; Laurent Ogé; Latifa Hamama; Laurent Crespel; Jessica Bertheloot; Jingtang Chen; Philippe Grappin; Soulaiman Sakr. 2021. "Convergence and Divergence of Sugar and Cytokinin Signaling in Plant Development." International Journal of Molecular Sciences 22, no. 3: 1282.

Preprint content
Published: 11 November 2020
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Shoot branching, which is regulated by a complex signalling network, is a major component of plant architecture and therefore of crop yield. Sugars, acting in a network with hormones, have recently emerged as key players in the control of shoot branching. Previous studies in dicotyledonous plants have shown that sucrose suppresses the inhibitory effect of the plant hormone strigolactone (SL) during this process. The molecular mechanisms underlying this effect are unknown. Here we show that sucrose could antagonise the suppressive action of SL on tillering in rice. At the mechanistic level, we revealed that sucrose alleviates SL-mediated degradation of D53. Increase in sucrose availability inhibits the expression of D3, which encodes the orthologue of the arabidopsis F-box MAX2 required for SL signalling. Over-expression of D3 prevented sucrose from inhibiting D53 degradation and enabled the SL inhibition of tillering under high sucrose. The enhanced bud elongation of the d3 mutant to sucrose treatment indicates that suppressed SL perception reduces the minimum amount of sucrose required for sustained bud outgrowth. Decapitation and sugar feeding experiments in pea indicate that RMS4, the D3/MAX2 orthologue in pea, is also involved in the interactions between sucrose and SL. This work shows that D3/MAX2/RMS4 is a key component in the integrating both SL and sugar pathways during the regulation of shoot architecture.

ACS Style

Suyash B. Patil; Francois F. Barbier; Jinfeng Zhao; Syed Adeel Zafar; Muhammad Uzair; Yinglu Sun; Jingjing Fang; Jessica Bertheloot; Soulaiman Sakr; Franziska Fichtner; Tinashe G. Chabikwa; Shoujiang Yuan; Christine A. Beveridge; Xueyong Li. Sucrose represses the expression of the strigolactone signalling gene D3/RMS4/MAX2 to promote tillering. 2020, 1 .

AMA Style

Suyash B. Patil, Francois F. Barbier, Jinfeng Zhao, Syed Adeel Zafar, Muhammad Uzair, Yinglu Sun, Jingjing Fang, Jessica Bertheloot, Soulaiman Sakr, Franziska Fichtner, Tinashe G. Chabikwa, Shoujiang Yuan, Christine A. Beveridge, Xueyong Li. Sucrose represses the expression of the strigolactone signalling gene D3/RMS4/MAX2 to promote tillering. . 2020; ():1.

Chicago/Turabian Style

Suyash B. Patil; Francois F. Barbier; Jinfeng Zhao; Syed Adeel Zafar; Muhammad Uzair; Yinglu Sun; Jingjing Fang; Jessica Bertheloot; Soulaiman Sakr; Franziska Fichtner; Tinashe G. Chabikwa; Shoujiang Yuan; Christine A. Beveridge; Xueyong Li. 2020. "Sucrose represses the expression of the strigolactone signalling gene D3/RMS4/MAX2 to promote tillering." , no. : 1.

Review
Published: 05 November 2020 in Frontiers in Plant Science
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Plants are autotrophic organisms that self-produce sugars through photosynthesis. These sugars serve as an energy source, carbon skeletons, and signaling entities throughout plants’ life. Post-transcriptional regulation of gene expression plays an important role in various sugar-related processes. In cells, it is regulated by many factors, such as RNA-binding proteins (RBPs), microRNAs, the spliceosome, etc. To date, most of the investigations into sugar-related gene expression have been focused on the transcriptional level in plants, while only a few studies have been conducted on post-transcriptional mechanisms. The present review provides an overview of the relationships between sugar and post-transcriptional regulation in plants. It addresses the relationships between sugar signaling and RBPs, microRNAs, and mRNA stability. These new items insights will help to reach a comprehensive understanding of the diversity of sugar signaling regulatory networks, and open onto new investigations into the relevance of these regulations for plant growth and development.

ACS Style

Ming Wang; Lili Zang; Fuchao Jiao; Maria-Dolores Perez-Garcia; Laurent Ogé; Latifa Hamama; José Le Gourrierec; Soulaiman Sakr; Jingtang Chen. Sugar Signaling and Post-transcriptional Regulation in Plants: An Overlooked or an Emerging Topic? Frontiers in Plant Science 2020, 11, 1 .

AMA Style

Ming Wang, Lili Zang, Fuchao Jiao, Maria-Dolores Perez-Garcia, Laurent Ogé, Latifa Hamama, José Le Gourrierec, Soulaiman Sakr, Jingtang Chen. Sugar Signaling and Post-transcriptional Regulation in Plants: An Overlooked or an Emerging Topic? Frontiers in Plant Science. 2020; 11 ():1.

Chicago/Turabian Style

Ming Wang; Lili Zang; Fuchao Jiao; Maria-Dolores Perez-Garcia; Laurent Ogé; Latifa Hamama; José Le Gourrierec; Soulaiman Sakr; Jingtang Chen. 2020. "Sugar Signaling and Post-transcriptional Regulation in Plants: An Overlooked or an Emerging Topic?" Frontiers in Plant Science 11, no. : 1.

Preprint content
Published: 29 October 2020
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- Plant architecture is controlled by several endogenous signals including hormones and sugars. However, only little is known about the nature and roles of the sugar signalling pathways in this process. Here we test whether the sugar pathway mediated by HEXOKINASE1 (HXK1) is involved in the control of shoot branching. - To test the involvement of HXK1 in the control of shoot architecture we modulated the HXK1 pathway using physiological and genetic approaches in diverse plants, rose, arabidopsis and pea and evaluated impacts of hormonal pathways. - We show that triggering a hexokinase-dependent pathway was able to promote bud outgrowth in pea and rose. In arabidopsis, both HXK1 deficiency and defoliation led to decreased shoot branching and conferred hypersensitivity to auxin.HXK1expression was positively correlated with sugar availability. HXK1-deficient plants displayed decreased cytokinin levels and increased expression ofMAX2which is required for strigolactone signalling. The branching phenotype of HXK1-deficient plants could be partly restored by cytokinin treatment and strigolactone deficiency could override the negative impact ofHXK1deficiency on shoot branching. - Our observations demonstrate that a HXK1-dependent pathway contributes to the regulation of shoot branching and interact with hormones to modulate plant architecture.

ACS Style

Francois Fabien Barbier; Da Cao; Franziska Fichtner; Christoph Weiste; Maria-Dolores Perez-Garcia; Mathieu Caradeuc; Jose Le Gourrierec; Soulaiman Sakr; Christine Anne Beveridge. HEXOKINASE1 interferes with cytokinin synthesis and strigolactone perception during sugar-induced shoot branching. 2020, 1 .

AMA Style

Francois Fabien Barbier, Da Cao, Franziska Fichtner, Christoph Weiste, Maria-Dolores Perez-Garcia, Mathieu Caradeuc, Jose Le Gourrierec, Soulaiman Sakr, Christine Anne Beveridge. HEXOKINASE1 interferes with cytokinin synthesis and strigolactone perception during sugar-induced shoot branching. . 2020; ():1.

Chicago/Turabian Style

Francois Fabien Barbier; Da Cao; Franziska Fichtner; Christoph Weiste; Maria-Dolores Perez-Garcia; Mathieu Caradeuc; Jose Le Gourrierec; Soulaiman Sakr; Christine Anne Beveridge. 2020. "HEXOKINASE1 interferes with cytokinin synthesis and strigolactone perception during sugar-induced shoot branching." , no. : 1.

Journal article
Published: 25 June 2020 in Agronomy
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Plant shape, and thereby plant architecture, is a major component of the visual quality of ornamental plants. Plant architecture results from growth and branching processes and is dependent on genetic and environmental factors such as light quality. The effects of genotype and light quality and their interaction were evaluated on rose bush architecture. In a climatic growth chamber, three cultivars (Baipome, Knock Out® Radrazz and ‘The Fairy’) with contrasting architecture were exposed to three different light spectra, using white (W), red (R), and far-red (FR) light-emitting diodes (LEDs), i.e., W, WR, and WRFR. The R/FR ratio varied between treatments, ranging from 7.5 for WRFR to 23.2 for WR. Light intensity (224.6 μmol m−2 s−1) was the same for all treatments. Plants were grown up to the order 1 axis flowering stage, and their architecture was digitized at two observation scales—plant and axis. Highly significant genotype and light quality effects were revealed for most of the variables measured. An increase in stem length, in the number of axes and in the number of flowered axes was observed under the FR enriched light, WRFR. However, a strong genotype × light quality interaction, i.e., a genotype-specific response was highlighted. More in-depth eco-physiological and biochemical investigations are needed to better understand rose behavior in response to light quality and thus identify the determinants of the genotype × light quality interaction.

ACS Style

Laurent Crespel; Camille Le Bras; Thomas Amoroso; Mateo Gabriel Unda Ulloa; Philippe Morel; Soulaiman Sakr. Genotype × Light Quality Interaction on Rose Architecture. Agronomy 2020, 10, 913 .

AMA Style

Laurent Crespel, Camille Le Bras, Thomas Amoroso, Mateo Gabriel Unda Ulloa, Philippe Morel, Soulaiman Sakr. Genotype × Light Quality Interaction on Rose Architecture. Agronomy. 2020; 10 (6):913.

Chicago/Turabian Style

Laurent Crespel; Camille Le Bras; Thomas Amoroso; Mateo Gabriel Unda Ulloa; Philippe Morel; Soulaiman Sakr. 2020. "Genotype × Light Quality Interaction on Rose Architecture." Agronomy 10, no. 6: 913.

Regular article
Published: 17 September 2019 in New Phytologist
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Apical dominance occurs when the growing shoot tip inhibits the outgrowth of axillary buds. Apically‐derived auxin in the nodal stem indirectly inhibits bud outgrowth via cytokinins and strigolactones. Recently, sugar deprivation was found to contribute to this phenomenon. Using rose and pea, we investigated whether sugar availability interacts with auxin in bud outgrowth control, and the role of cytokinins and strigolactones, in vitro and in planta. We show that sucrose antagonizes auxin's effect on bud outgrowth, in a dose‐dependent and coupled manner. Sucrose also suppresses strigolactone‐inhibition of outgrowth, and rms3 strigolactone‐perception mutant is less affected by reducing sucrose supply; however, sucrose does not interfere with the regulation of cytokinin levels by auxin, and stimulates outgrowth even with optimal cytokinin supply. These observations were assembled into a computational model where sucrose represses bud response to strigolactones, largely independently of cytokinin levels. It quantitatively captures our observed dose‐dependent sucrose‐hormones effects on bud outgrowth, and allows us to express outgrowth response to various combinations of auxin and sucrose levels as a simple quantitative law. This study places sugars in the bud outgrowth regulatory network, and paves the way for better understanding of branching plasticity in response to environmental and genotypic factors.

ACS Style

Jessica Bertheloot; François Barbier; Frédéric Boudon; Maria Dolores Perez‐Garcia; Thomas Péron; Sylvie Citerne; Elizabeth Dun; Christine Beveridge; Christophe Godin; Soulaiman Sakr. Sugar availability suppresses the auxin‐induced strigolactone pathway to promote bud outgrowth. New Phytologist 2019, 225, 866 -879.

AMA Style

Jessica Bertheloot, François Barbier, Frédéric Boudon, Maria Dolores Perez‐Garcia, Thomas Péron, Sylvie Citerne, Elizabeth Dun, Christine Beveridge, Christophe Godin, Soulaiman Sakr. Sugar availability suppresses the auxin‐induced strigolactone pathway to promote bud outgrowth. New Phytologist. 2019; 225 (2):866-879.

Chicago/Turabian Style

Jessica Bertheloot; François Barbier; Frédéric Boudon; Maria Dolores Perez‐Garcia; Thomas Péron; Sylvie Citerne; Elizabeth Dun; Christine Beveridge; Christophe Godin; Soulaiman Sakr. 2019. "Sugar availability suppresses the auxin‐induced strigolactone pathway to promote bud outgrowth." New Phytologist 225, no. 2: 866-879.

Preprint
Published: 30 August 2019
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SUMMARYApical dominance occurs when the growing shoot tip inhibits the outgrowth of axillary buds. Apically-derived auxin in the nodal stem indirectly inhibits bud outgrowth via cytokinins and strigolactones. Recently, sugar deprivation was found to contribute to this phenomenon.Using rose and pea, we investigated whether sugar availability interacts with auxin in bud outgrowth control, and the role of cytokinins and strigolactones, in vitro and in planta.We show that sucrose antagonizes auxin’s effect on bud outgrowth, in a dose-dependent and coupled manner. Sucrose also suppresses strigolactone-inhibition of outgrowth, and rms3 strigolactone-perception mutant is less affected by reducing sucrose supply; however, sucrose does not interfere with the regulation of cytokinin levels by auxin, and stimulates outgrowth even with optimal cytokinin supply. These observations were assembled into a computational model where sucrose represses bud response to strigolactones, largely independently of cytokinin levels. It quantitatively captures our observed dose-dependent sucrose-hormones effects on bud outgrowth, and allows us to express outgrowth response to various combinations of auxin and sucrose levels as a simple quantitative law.This study places sugars in the bud outgrowth regulatory network, and paves the way for better understanding of branching plasticity in response to environmental and genotypic factors.

ACS Style

Jessica Bertheloot; Francois Fabien Barbier; Frederic Boudon; Maria-Dolores Perez-Garcia; Thomas Peron; Sylvie Citerne; Elizabeth Dun; Christine Beveridge; Christophe Godin; Soulaiman Sakr; Elisabeth Dun. Sugar availability suppresses the auxin-induced strigolactone pathway to promote bud outgrowth. 2019, 752147 .

AMA Style

Jessica Bertheloot, Francois Fabien Barbier, Frederic Boudon, Maria-Dolores Perez-Garcia, Thomas Peron, Sylvie Citerne, Elizabeth Dun, Christine Beveridge, Christophe Godin, Soulaiman Sakr, Elisabeth Dun. Sugar availability suppresses the auxin-induced strigolactone pathway to promote bud outgrowth. . 2019; ():752147.

Chicago/Turabian Style

Jessica Bertheloot; Francois Fabien Barbier; Frederic Boudon; Maria-Dolores Perez-Garcia; Thomas Peron; Sylvie Citerne; Elizabeth Dun; Christine Beveridge; Christophe Godin; Soulaiman Sakr; Elisabeth Dun. 2019. "Sugar availability suppresses the auxin-induced strigolactone pathway to promote bud outgrowth." , no. : 752147.

Journal article
Published: 04 August 2019 in International Journal of Molecular Sciences
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The shoot branching pattern is a determining phenotypic trait throughout plant development. During shoot branching, BRANCHED1 (BRC1) plays a master regulator role in bud outgrowth, and its transcript levels are regulated by various exogenous and endogenous factors. RhBRC1 (the homologous gene of BRC1 in Rosa hybrida) is a main branching regulator whose posttranscriptional regulation in response to sugar was investigated through its 3'UTR. Transformed Rosa calluses containing a construction composed of the CaMV35S promoter, the green fluorescent protein (GFP) reporter gene, and the 3'UTR of RhBRC1 (P35S:GFP::3'UTR RhBRC1 ) were obtained and treated with various combinations of sugars and with sugar metabolism effectors. The results showed a major role of the 3'UTR of RhBRC1 in response to sugars, involving glycolysis/the tricarboxylic acid cycle (TCA) and the oxidative pentose phosphate pathway (OPPP). In Rosa vegetative buds, sequence analysis of the RhBRC1 3'UTR identified six binding motifs specific to the Pumilio/FBF RNA-binding protein family (PUF) and probably involved in posttranscriptional regulation. RhPUF4 was highly expressed in the buds of decapitated plants and in response to sugar availability in in-vitro-cultured buds. RhPUF4 was found to be close to AtPUM2, which encodes an Arabidopsis PUF protein. In addition, sugar-dependent upregulation of RhPUF4 was also found in Rosa calluses. RhPUF4 expression was especially dependent on the OPPP, supporting its role in OPPP-dependent posttranscriptional regulation of RhBRC1. These findings indicate that the 3'UTR sequence could be an important target in the molecular regulatory network of RhBRC1 and pave the way for investigating new aspects of RhBRC1 regulation.

ACS Style

Ming Wang; Laurent Ogé; Linda Voisine; Maria-Dolores Perez-Garcia; Julien Jeauffre; Laurence Hibrand Saint-Oyant; Philippe Grappin; Latifa Hamama; Soulaiman Sakr. Posttranscriptional Regulation of RhBRC1 (Rosa hybrida BRANCHED1) in Response to Sugars is Mediated via its Own 3' Untranslated Region, with a Potential Role of RhPUF4 (Pumilio RNA-Binding Protein Family). International Journal of Molecular Sciences 2019, 20, 3808 .

AMA Style

Ming Wang, Laurent Ogé, Linda Voisine, Maria-Dolores Perez-Garcia, Julien Jeauffre, Laurence Hibrand Saint-Oyant, Philippe Grappin, Latifa Hamama, Soulaiman Sakr. Posttranscriptional Regulation of RhBRC1 (Rosa hybrida BRANCHED1) in Response to Sugars is Mediated via its Own 3' Untranslated Region, with a Potential Role of RhPUF4 (Pumilio RNA-Binding Protein Family). International Journal of Molecular Sciences. 2019; 20 (15):3808.

Chicago/Turabian Style

Ming Wang; Laurent Ogé; Linda Voisine; Maria-Dolores Perez-Garcia; Julien Jeauffre; Laurence Hibrand Saint-Oyant; Philippe Grappin; Latifa Hamama; Soulaiman Sakr. 2019. "Posttranscriptional Regulation of RhBRC1 (Rosa hybrida BRANCHED1) in Response to Sugars is Mediated via its Own 3' Untranslated Region, with a Potential Role of RhPUF4 (Pumilio RNA-Binding Protein Family)." International Journal of Molecular Sciences 20, no. 15: 3808.

Review article
Published: 12 February 2019 in Frontiers in Plant Science
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Shoot branching is a key process for plant growth and fitness. Newly produced axes result from axillary bud outgrowth, which is at least partly mediated through the regulation of BRANCHED1 gene expression (BRC1/TB1/FC1). BRC1 encodes a pivotal bud-outgrowth-inhibiting transcription factor belonging to the TCP family. As the regulation of BRC1 expression is a hub for many shoot-branching-related mechanisms, it is influenced by endogenous (phytohormones and nutrients) and exogenous (light) inputs, which involve so-far only partly identified molecular networks. This review highlights the central role of BRC1 in shoot branching and its responsiveness to different stimuli, and emphasizes the different knowledge gaps that should be addressed in the near future.

ACS Style

Ming Wang; Marie-Anne Le Moigne; Jessica Bertheloot; Laurent Crespel; Maria-Dolores Perez-Garcia; Laurent Ogé; Sabine Demotes-Mainard; Latifa Hamama; Jean-Michel Davière; Soulaiman Sakr. BRANCHED1: A Key Hub of Shoot Branching. Frontiers in Plant Science 2019, 10, 76 .

AMA Style

Ming Wang, Marie-Anne Le Moigne, Jessica Bertheloot, Laurent Crespel, Maria-Dolores Perez-Garcia, Laurent Ogé, Sabine Demotes-Mainard, Latifa Hamama, Jean-Michel Davière, Soulaiman Sakr. BRANCHED1: A Key Hub of Shoot Branching. Frontiers in Plant Science. 2019; 10 ():76.

Chicago/Turabian Style

Ming Wang; Marie-Anne Le Moigne; Jessica Bertheloot; Laurent Crespel; Maria-Dolores Perez-Garcia; Laurent Ogé; Sabine Demotes-Mainard; Latifa Hamama; Jean-Michel Davière; Soulaiman Sakr. 2019. "BRANCHED1: A Key Hub of Shoot Branching." Frontiers in Plant Science 10, no. : 76.

Review
Published: 24 August 2018 in International Journal of Molecular Sciences
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Plant growth and development has to be continuously adjusted to the available resources. Their optimization requires the integration of signals conveying the plant metabolic status, its hormonal balance, and its developmental stage. Many investigations have recently been conducted to provide insights into sugar signaling and its interplay with hormones and nitrogen in the fine-tuning of plant growth, development, and survival. The present review emphasizes the diversity of sugar signaling integrators, the main molecular and biochemical mechanisms related to the sugar-signaling dependent regulations, and to the regulatory hubs acting in the interplay of the sugar-hormone and sugar-nitrogen networks. It also contributes to compiling evidence likely to fill a few knowledge gaps, and raises new questions for the future.

ACS Style

Soulaiman Sakr; Ming Wang; Fabienne Dédaldéchamp; Maria-Dolores Perez-Garcia; Laurent Ogé; Latifa Hamama; Rossitza Atanassova. The Sugar-Signaling Hub: Overview of Regulators and Interaction with the Hormonal and Metabolic Network. International Journal of Molecular Sciences 2018, 19, 2506 .

AMA Style

Soulaiman Sakr, Ming Wang, Fabienne Dédaldéchamp, Maria-Dolores Perez-Garcia, Laurent Ogé, Latifa Hamama, Rossitza Atanassova. The Sugar-Signaling Hub: Overview of Regulators and Interaction with the Hormonal and Metabolic Network. International Journal of Molecular Sciences. 2018; 19 (9):2506.

Chicago/Turabian Style

Soulaiman Sakr; Ming Wang; Fabienne Dédaldéchamp; Maria-Dolores Perez-Garcia; Laurent Ogé; Latifa Hamama; Rossitza Atanassova. 2018. "The Sugar-Signaling Hub: Overview of Regulators and Interaction with the Hormonal and Metabolic Network." International Journal of Molecular Sciences 19, no. 9: 2506.

Review
Published: 30 January 2018 in International Journal of Molecular Sciences
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Post-transcriptional regulation of gene expression plays a crucial role in many processes. In cells, it is mediated by diverse RNA-binding proteins. These proteins can influence mRNA stability, translation, and localization. The PUF protein family (Pumilio and FBF) is composed of RNA-binding proteins highly conserved among most eukaryotic organisms. Previous investigations indicated that they could be involved in many processes by binding corresponding motifs in the 3′UTR or by interacting with other proteins. To date, most of the investigations on PUF proteins have been focused on Caenorhabditis elegans, Drosophila melanogaster, and Saccharomyces cerevisiae, while only a few have been conducted on Arabidopsis thaliana. The present article provides an overview of the PUF protein family. It addresses their RNA-binding motifs, biological functions, and post-transcriptional control mechanisms in Caenorhabditis elegans, Drosophila melanogaster, Saccharomyces cerevisiae, and Arabidopsis thaliana. These items of knowledge open onto new investigations into the relevance of PUF proteins in specific plant developmental processes.

ACS Style

Ming Wang; Laurent Ogé; Maria-Dolores Perez-Garcia; Latifa Hamama; Soulaiman Sakr. The PUF Protein Family: Overview on PUF RNA Targets, Biological Functions, and Post Transcriptional Regulation. International Journal of Molecular Sciences 2018, 19, 410 .

AMA Style

Ming Wang, Laurent Ogé, Maria-Dolores Perez-Garcia, Latifa Hamama, Soulaiman Sakr. The PUF Protein Family: Overview on PUF RNA Targets, Biological Functions, and Post Transcriptional Regulation. International Journal of Molecular Sciences. 2018; 19 (2):410.

Chicago/Turabian Style

Ming Wang; Laurent Ogé; Maria-Dolores Perez-Garcia; Latifa Hamama; Soulaiman Sakr. 2018. "The PUF Protein Family: Overview on PUF RNA Targets, Biological Functions, and Post Transcriptional Regulation." International Journal of Molecular Sciences 19, no. 2: 410.

Original article
Published: 30 September 2017 in Tree Genetics & Genomes
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Plant shape, and thereby plant architecture, is a major component of the visual quality of ornamental plants. We have been developing a new method for analyzing the entire plant architecture by 3D digitalization that allows an almost exhaustive description of rose bush architecture and generates a large number of variables, many of them inaccessible manually. We carried out a QTL analysis using this original phenotyping method. In order to evaluate a broader allelic variability as well as the effect of the genetic background on QTL detection, we used two connected, segregating, recurrent blooming populations. The number of QTLs per variable varied from three for the number of determined axes (NbDetA) to seven for the branching angle of order 2 long axes (AngLA2), the two populations taken together. Five new QTLs, located on the linkage groups (LGs) 2, 6, and 7, were detected for the branching angle of axes, and the QTL located on LG7 co-localized with RhBRC1, a branching repressor. Branching and stem elongation QTLs also co-located with RhBRC1, suggesting its pleiotropic nature. Year-specific QTLs were also revealed, that explained the genotype × year interactions observed for the number of order 3 short axes (NbSA3) and AngLA2 from a genetic point of view. We also evidenced an effect of the genetic background on QTL detection. This new knowledge should help to better reason the genetic improvement programs for rose bush architecture and, therefore, rose bush shape.

ACS Style

Camille Li-Marchetti; Camille Le Bras; Annie Chastellier; Daniel Relion; Philippe Morel; Soulaiman Sakr; Laurence Hibrand-Saint Oyant; Laurent Crespel. 3D phenotyping and QTL analysis of a complex character: rose bush architecture. Tree Genetics & Genomes 2017, 13, 1 .

AMA Style

Camille Li-Marchetti, Camille Le Bras, Annie Chastellier, Daniel Relion, Philippe Morel, Soulaiman Sakr, Laurence Hibrand-Saint Oyant, Laurent Crespel. 3D phenotyping and QTL analysis of a complex character: rose bush architecture. Tree Genetics & Genomes. 2017; 13 (5):1.

Chicago/Turabian Style

Camille Li-Marchetti; Camille Le Bras; Annie Chastellier; Daniel Relion; Philippe Morel; Soulaiman Sakr; Laurence Hibrand-Saint Oyant; Laurent Crespel. 2017. "3D phenotyping and QTL analysis of a complex character: rose bush architecture." Tree Genetics & Genomes 13, no. 5: 1.

Journal article
Published: 01 January 2016 in Environmental and Experimental Botany
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International audienceLight drives plant growth and development, so its control is increasingly used as an environment-friendly tool to manage horticultural crops. However, this implies a comprehensive view of the main physiological processes under light control, and bridging knowledge gaps. This review presents the state of the art in i) perception of red (R) and far-red (FR) wavelengths and of the R:FR ratio by plants, ii) phenotypic plant responses, and iii) the molecular mechanisms related to these responses. Changes in red or far red radiation and R:FR ratios are perceived by phytochromes. Phytochrome-mediated regulation is complex and specific to each physiological process. Our review presents the effects of red and far-red lights on germination, aerial architectural development, flowering, photosynthesis and plant nutrition. It also addresses how red and far-red radiations interact with tolerance to drought, pathogens and herbivores. Current knowledge about the mechanisms whereby red, far-red and R:FR regulate these different processes is presented. The specific actors of light signal transduction are better known for germination or flowering than for other processes such as internode elongation or bud outgrowth. The phenotypic response to red, far-red and R:FR can vary among species, but also with growing conditions. The mechanisms underlying these differences in plant responses still need to be unveiled. Current knowledge about plants' response to light is being applied in horticulture to improve crop yield and quality. To that purpose, it is now possible to manipulate light quality thanks to recent technological evolutions such as the development of photo-selective films and light-emitting diodes.

ACS Style

Sabine Demotes-Mainard; Thomas Péron; Adrien Corot; Jessica Bertheloot; José Le Gourrierec; Sandrine Pelleschi-Travier; Laurent Crespel; Philippe Morel; Lydie Huché-Thélier; Rachid Boumaza; Alain Vian; Vincent Guérin; Nathalie Leduc; Soulaiman Sakr. Plant responses to red and far-red lights, applications in horticulture. Environmental and Experimental Botany 2016, 121, 4 -21.

AMA Style

Sabine Demotes-Mainard, Thomas Péron, Adrien Corot, Jessica Bertheloot, José Le Gourrierec, Sandrine Pelleschi-Travier, Laurent Crespel, Philippe Morel, Lydie Huché-Thélier, Rachid Boumaza, Alain Vian, Vincent Guérin, Nathalie Leduc, Soulaiman Sakr. Plant responses to red and far-red lights, applications in horticulture. Environmental and Experimental Botany. 2016; 121 ():4-21.

Chicago/Turabian Style

Sabine Demotes-Mainard; Thomas Péron; Adrien Corot; Jessica Bertheloot; José Le Gourrierec; Sandrine Pelleschi-Travier; Laurent Crespel; Philippe Morel; Lydie Huché-Thélier; Rachid Boumaza; Alain Vian; Vincent Guérin; Nathalie Leduc; Soulaiman Sakr. 2016. "Plant responses to red and far-red lights, applications in horticulture." Environmental and Experimental Botany 121, no. : 4-21.

Journal article
Published: 23 September 2013 in Plant, Cell & Environment
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Light and temperature are two environmental factors that deeply affect bud outgrowth. However, little is known about their impact on the bud burst gradient along a stem and their interactions with the molecular mechanisms of bud burst control. We investigated this question in two acrotonic rose cultivars. We demonstrated that the darkening of distal buds or exposure to cold (5 °C) prior to transfer to mild temperatures (20 °C) both repress acrotony, allowing the burst of quiescent medial and proximal buds. We sequenced the strigolactone pathway MAX‐homologous genes in rose and studied their expression in buds and internodes along the stem. Only expressions of RwMAX1, RwMAX2 and RwMAX4 were detected. Darkening of the distal part of the shoot triggered a strong increase of RwMAX2 expression in darkened buds and bark‐phloem samples, whereas it suppressed the acropetal gradient of the expression of RwMAX1 observed in stems fully exposed to light. Cold treatment induced an acropetal gradient of expression of RwMAX1 in internodes and of RwMAX2 in buds along the stem. Our results suggest that the bud burst gradient along the stem cannot be explained by a gradient of expression of RwMAX genes but rather by their local level of expression at each individual position.

ACS Style

Samia Djennane; Laurence Hibrand-Saint Oyant; Koji Kawamura; David Lalanne; Michel Laffaire; Tatiana Thouroude; Séverine Chalain; Soulaiman Sakr; Rachid Boumaza; Fabrice Foucher; Nathalie LeDuc. Impacts of light and temperature on shoot branching gradient and expression of strigolactone synthesis and signalling genes in rose. Plant, Cell & Environment 2013, 37, 742 -757.

AMA Style

Samia Djennane, Laurence Hibrand-Saint Oyant, Koji Kawamura, David Lalanne, Michel Laffaire, Tatiana Thouroude, Séverine Chalain, Soulaiman Sakr, Rachid Boumaza, Fabrice Foucher, Nathalie LeDuc. Impacts of light and temperature on shoot branching gradient and expression of strigolactone synthesis and signalling genes in rose. Plant, Cell & Environment. 2013; 37 (3):742-757.

Chicago/Turabian Style

Samia Djennane; Laurence Hibrand-Saint Oyant; Koji Kawamura; David Lalanne; Michel Laffaire; Tatiana Thouroude; Séverine Chalain; Soulaiman Sakr; Rachid Boumaza; Fabrice Foucher; Nathalie LeDuc. 2013. "Impacts of light and temperature on shoot branching gradient and expression of strigolactone synthesis and signalling genes in rose." Plant, Cell & Environment 37, no. 3: 742-757.

Journal article
Published: 08 January 2013 in Scientia Horticulturae
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Plant branching, which results from axillary bud burst, governs plant architectural development, shape and visual quality. Bud burst is known to be sensitive to environmental conditions, including long-term changes in water status or light intensity. However, little is known about the effects of temporary water or light intensity constraints. We therefore studied the impact of temporary water restriction or light limitation on the branching and development of rose bush axes. Rooted cuttings of Rosa hybrida ‘Radrazz’ were grown until the secondary axes had ceased to elongate, in a greenhouse for water experiment and in growth chambers for light experiment. During the water experiment, the irrigation threshold was maintained at −8 kPa to ensure that water was not limiting until the primary axis reached the floral bud visible stage. Plants were then subjected to water restriction for 0, 7, 14, 21 or 35 days, with an irrigation threshold of −26 kPa. They were then returned to the initial conditions and grown without water constraint until the end of the experiment. During the light experiment, plants subjected to light limitation were illuminated with low-intensity light (91 μmol m−2 s−1) from cutting bud burst until the floral bud visible stage (16 days), or to the petal color visible stage (27 days). Plants were then placed at high light intensity (580 μmol m−2 s−1). Control plants were maintained continuously in high-light intensity conditions. We found that, during constraint, a similar number (water restriction) or fewer (light limitation) buds burst than in control plants. When constraints were released, bud burst rapidly increased to levels +41–54% higher than those of control plants for water-restricted plants and +34–45% higher than those of control plants for light-limited plants. Excess bud burst occurred in the median zone of the primary axis. Flowering shoot number was 35% and 22% higher than control levels in plants subjected to 16 and 27 days of light limitation, respectively. Water limitation did not increase the number of flowering shoots despite the increase in bud burst it induced, due to an increase in the number of blind shoots. Overall, our findings show, for the first time, that temporary water or light restrictions promote the branching and development of rose bush axes. We suggest that sugar metabolism and hormonal regulation may be involved in stimulating branching after the release of these two types of constraint.

ACS Style

Sabine Demotes-Mainard; Lydie Huché-Thélier; Philippe Morel; Rachid Boumaza; Vincent Guérin; Soulaiman Sakr. Temporary water restriction or light intensity limitation promotes branching in rose bush. Scientia Horticulturae 2013, 150, 432 -440.

AMA Style

Sabine Demotes-Mainard, Lydie Huché-Thélier, Philippe Morel, Rachid Boumaza, Vincent Guérin, Soulaiman Sakr. Temporary water restriction or light intensity limitation promotes branching in rose bush. Scientia Horticulturae. 2013; 150 ():432-440.

Chicago/Turabian Style

Sabine Demotes-Mainard; Lydie Huché-Thélier; Philippe Morel; Rachid Boumaza; Vincent Guérin; Soulaiman Sakr. 2013. "Temporary water restriction or light intensity limitation promotes branching in rose bush." Scientia Horticulturae 150, no. : 432-440.

Journal article
Published: 01 December 2012 in Biologia plantarum
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Leaf hydraulic conductance (Kleaf) plays a significant part in plant-water regulation. In walnut leaves, Kleaf is stimulated by irradiance and closely relates to the accumulation of JrPIP2s aquaporin transcripts, but it is independent of stomatal aperture. To provide an insight into the early molecular events occurred during light-induced Kleaf, a large-scale transcriptomic analysis consisting of the cDNA-amplified fragment length polymorphism (AFLP) was carried out on walnut leaves maintained under irradiance or in darkness. Of the total 12 000 transcript-derived fragments (TDFs) obtained using cDNA-AFLP with 128 primer pairs, 187 TDFs were selected after sequencing, and only 93 (49 %) that had been ascribed known functions through BLAST searching of the GenBank databases. Most of these TDFs correspond to genes whose protein products are involved in cellular regulation (57.9 %) and global metabolism (39.8 %). To validate cDNA-AFLP expression patterns, 30 TDFs were further analyzed using real-time quantitative polymerase chain reaction. Moreover, exposure of leaves to irradiance was accompanied by the modification of the Ca2+-signaling pathway, ubiquitin-proteasome pathway, vesicle trafficking process and expression of multiple transcription factors.

ACS Style

K. Ben Bâaziz; D. Lopez; S. Bouzid; H. Cochard; J. -S. Venisse; S. Sakr. Early gene expression in the walnut tree occurring during stimulation of leaf hydraulic conductance by irradiance. Biologia plantarum 2012, 56, 657 -666.

AMA Style

K. Ben Bâaziz, D. Lopez, S. Bouzid, H. Cochard, J. -S. Venisse, S. Sakr. Early gene expression in the walnut tree occurring during stimulation of leaf hydraulic conductance by irradiance. Biologia plantarum. 2012; 56 (4):657-666.

Chicago/Turabian Style

K. Ben Bâaziz; D. Lopez; S. Bouzid; H. Cochard; J. -S. Venisse; S. Sakr. 2012. "Early gene expression in the walnut tree occurring during stimulation of leaf hydraulic conductance by irradiance." Biologia plantarum 56, no. 4: 657-666.

Comparative study
Published: 01 September 2012 in Journal of Plant Physiology
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Light is a critical determinant of plant shape by controlling branching patterns and bud burst in many species. To gain insight into how light induces bud burst, we investigated whether its inductive effect in rose was related to gibberellin (GA) biosynthesis. In axillary buds of beheaded plants subject to light, the expression of two GA biosynthesis genes (RoGA20ox and RoGA3ox) was promptly and strongly induced, while that of a GA-catabolism genes (RoGA2ox) was reduced. By contrast, lower expression levels of these two GA biosynthesis genes were found in darkness, and correlated with a total inhibition of bud burst. This effect was dependent on both light intensity and quality. In in vitro cultured buds, the inductive effect of light on the growth of preformed leaves and SAM organogenic activity was inhibited by ancymidol and paclobutrazol, two effectors of GA biosynthesis. This effect was concentration-dependent, and negated by GA(3). However, GA(3) alone could not rescue bud burst in the dark. GA biosynthesis was also required for the expression and activity of a vacuolar invertase, and therefore for light-induced sugar metabolism within buds. These findings are evidence that GA biosynthesis contributes to the light effect on bud burst and lay the foundations of a better understanding of its exact role in plant branching

ACS Style

Djillali Choubane; Amélie Rabot; Eric Mortreau; Jose Legourrierec; Thomas Péron; Fabrice Foucher; Youyou Ahcène; Sandrine Pelleschi-Travier; Nathalie Leduc; Latifa Hamama; Soulaiman Sakr. Photocontrol of bud burst involves gibberellin biosynthesis in Rosa sp. Journal of Plant Physiology 2012, 169, 1271 -1280.

AMA Style

Djillali Choubane, Amélie Rabot, Eric Mortreau, Jose Legourrierec, Thomas Péron, Fabrice Foucher, Youyou Ahcène, Sandrine Pelleschi-Travier, Nathalie Leduc, Latifa Hamama, Soulaiman Sakr. Photocontrol of bud burst involves gibberellin biosynthesis in Rosa sp. Journal of Plant Physiology. 2012; 169 (13):1271-1280.

Chicago/Turabian Style

Djillali Choubane; Amélie Rabot; Eric Mortreau; Jose Legourrierec; Thomas Péron; Fabrice Foucher; Youyou Ahcène; Sandrine Pelleschi-Travier; Nathalie Leduc; Latifa Hamama; Soulaiman Sakr. 2012. "Photocontrol of bud burst involves gibberellin biosynthesis in Rosa sp." Journal of Plant Physiology 169, no. 13: 1271-1280.

Journal article
Published: 13 April 2012 in Plant and Cell Physiology
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Bud burst is a decisive process in plant architecture that requires light in Rosa sp. This light effect was correlated with stimulation of sugar transport and metabolism in favor of bud outgrowth. We investigated whether sugars could act as signaling entities in the light-mediated regulation of vacuolar invertases and bud burst. Full-length cDNAs encoding two vacuolar invertases (RhVI1 and RhVI2) were isolated from buds. Unlike RhVI2, RhVI1 was preferentially expressed in bursting buds, and was up-regulated in buds of beheaded plants exposed to light. To assess the importance of sugars in this process, the expression of RhVI1 and RhVI2 and the total vacuolar invertase activity were further characterized in buds cultured in vitro on 100 mM sucrose or mannitol under light or in darkness for 48 h. Unlike mannitol, sucrose promoted the stimulatory effect of light on both RhVI1 expression and vacuolar invertase activity. This up-regulation of RhVI1 was rapid (after 6 h incubation) and was induced by as little as 10 mM sucrose or fructose. No effect of glucose was found. Interestingly, both 30 mM palatinose (a non-metabolizable sucrose analog) and 5 mM psicose (a non-metabolizable fructose analog) promoted the light-induced expression of RhVI1 and total vacuolar invertase activity. Sucrose, fructose, palatinose and psicose all promoted bursting of in vitro cultured buds under light. These findings indicate that soluble sugars contribute to the light effect on bud burst and vacuolar invertases, and can function as signaling entities.

ACS Style

Amelie Rabot; Clemence Henry; Khaoula Ben Baaziz; Eric Mortreau; Wassim Azri; Jeremy Lothier; Latifa Hamama; Rachid Boummaza; Nathalie Leduc; Sandrine Pelleschi-Travier; José Le Gourrierec; Soulaiman Sakr. Insight into the Role of Sugars in Bud Burst Under Light in the Rose. Plant and Cell Physiology 2012, 53, 1068 -1082.

AMA Style

Amelie Rabot, Clemence Henry, Khaoula Ben Baaziz, Eric Mortreau, Wassim Azri, Jeremy Lothier, Latifa Hamama, Rachid Boummaza, Nathalie Leduc, Sandrine Pelleschi-Travier, José Le Gourrierec, Soulaiman Sakr. Insight into the Role of Sugars in Bud Burst Under Light in the Rose. Plant and Cell Physiology. 2012; 53 (6):1068-1082.

Chicago/Turabian Style

Amelie Rabot; Clemence Henry; Khaoula Ben Baaziz; Eric Mortreau; Wassim Azri; Jeremy Lothier; Latifa Hamama; Rachid Boummaza; Nathalie Leduc; Sandrine Pelleschi-Travier; José Le Gourrierec; Soulaiman Sakr. 2012. "Insight into the Role of Sugars in Bud Burst Under Light in the Rose." Plant and Cell Physiology 53, no. 6: 1068-1082.