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Myrto Tsiknia
Université Bourgogne Franche-Comté, INRAE, AgroSup Dijon, Agroécologie, Dijon, France

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Article
Published: 28 July 2021 in The ISME Journal
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Microbial communities play important roles in all ecosystems and yet a comprehensive understanding of the ecological processes governing the assembly of these communities is missing. To address the role of biotic interactions between microorganisms in assembly and for functioning of the soil microbiota, we used a top-down manipulation approach based on the removal of various populations in a natural soil microbial community. We hypothesized that removal of certain microbial groups will strongly affect the relative fitness of many others, therefore unraveling the contribution of biotic interactions in shaping the soil microbiome. Here we show that 39% of the dominant bacterial taxa across treatments were subjected to competitive interactions during soil recolonization, highlighting the importance of biotic interactions in the assembly of microbial communities in soil. Moreover, our approach allowed the identification of microbial community assembly rule as exemplified by the competitive exclusion between members of Bacillales and Proteobacteriales. Modified biotic interactions resulted in greater changes in activities related to N- than to C-cycling. Our approach can provide a new and promising avenue to study microbial interactions in complex ecosystems as well as the links between microbial community composition and ecosystem function.

ACS Style

Sana Romdhane; Aymé Spor; Julie Aubert; David Bru; Marie-Christine Breuil; Sara Hallin; Arnaud Mounier; Sarah Ouadah; Myrto Tsiknia; Laurent Philippot. Unraveling negative biotic interactions determining soil microbial community assembly and functioning. The ISME Journal 2021, 1 -11.

AMA Style

Sana Romdhane, Aymé Spor, Julie Aubert, David Bru, Marie-Christine Breuil, Sara Hallin, Arnaud Mounier, Sarah Ouadah, Myrto Tsiknia, Laurent Philippot. Unraveling negative biotic interactions determining soil microbial community assembly and functioning. The ISME Journal. 2021; ():1-11.

Chicago/Turabian Style

Sana Romdhane; Aymé Spor; Julie Aubert; David Bru; Marie-Christine Breuil; Sara Hallin; Arnaud Mounier; Sarah Ouadah; Myrto Tsiknia; Laurent Philippot. 2021. "Unraveling negative biotic interactions determining soil microbial community assembly and functioning." The ISME Journal , no. : 1-11.

Journal article
Published: 02 July 2021 in Rhizosphere
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Arbuscular mycorrhizal fungi (AMF) are soilborne microorganisms that establish a mutualistic symbiotic association with most of land plants. To investigate the effects of AMF symbiosis under different water status conditions, we grew AMF-inoculated and non-inoculated tomato plants in the greenhouse under two irrigation regimes, 70% and 30% of growth-substrate water holding capacity. Two different AMF inoculation strains, Funneliformis mosseae and Rhizophagus irregularis, were applied as single inocula. AMF colonization significantly enhanced plant vegetative growth by 40% and 50–60%, under normal and reduced irrigation respectively. In the presence of the AMF, phosphorous concentrations in the leaves were increased under both watering regimes while K, Ca, Mg, Zn, and Mn were also increased under limited watering to levels similar to those of non-stressed plants. Transpiration and stomatal conductance increased by an average 80% and 65% respectively in the presence of the AMF under full watering, but were kept stable and coupled to reduced leaf area-to-leaf biomass ratios and to increased metabolic water use efficiency under limited irrigation. This indicates a different mode of action induced by AMF colonizers, prioritizing water conservation in tomato plants under drought stress.

ACS Style

G. Leventis; M. Tsiknia; M. Feka; E.V. Ladikou; I.E. Papadakis; I. Chatzipavlidis; K. Papadopoulou; C. Ehaliotis. Arbuscular mycorrhizal fungi enhance growth of tomato under normal and drought conditions, via different water regulation mechanisms. Rhizosphere 2021, 19, 100394 .

AMA Style

G. Leventis, M. Tsiknia, M. Feka, E.V. Ladikou, I.E. Papadakis, I. Chatzipavlidis, K. Papadopoulou, C. Ehaliotis. Arbuscular mycorrhizal fungi enhance growth of tomato under normal and drought conditions, via different water regulation mechanisms. Rhizosphere. 2021; 19 ():100394.

Chicago/Turabian Style

G. Leventis; M. Tsiknia; M. Feka; E.V. Ladikou; I.E. Papadakis; I. Chatzipavlidis; K. Papadopoulou; C. Ehaliotis. 2021. "Arbuscular mycorrhizal fungi enhance growth of tomato under normal and drought conditions, via different water regulation mechanisms." Rhizosphere 19, no. : 100394.

Journal article
Published: 22 May 2021 in Sustainability
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The phenolic profile of the grape berries is a key quality factor for the red grapevine varieties and several techniques have been applied to improve it. An innovative technique is the application of resistance elicitors and phytohormones. In the present study, leaves and berries of a Greek red indigenous variety (Mouhtaro) sprayed with two elicitors, benzothiadiazole and chitosan and a plant hormone abscisic acid, during veraison. Physicochemical and phenolic characteristics of the berries and microbial communities of rhizosphere, phyllosphere and carposphere were analyzed at harvest. Differences in the microbial communities on different plant compartments were observed after the application of the plant activators. Chitosan treatment increased the abundance of the beneficial lactic acid bacteria, while the abscisic acid treatment decreased the presence of spoilage fungi on the carposphere. Treatments differentiate total phenolics, anthocyanins and in the chemical characteristics of grape must with chitosan treated grapes had increased anthocyanins and skin-derived phenolics that correlated positively with the microbial taxa that was discriminant by LefSe analysis. This research provides an overview of the effect of plant activators on the microbial ecology and grape quality of the Greek variety Mouhtaro and presents the potential of new and innovative approaches in the field of sustainable viticulture.

ACS Style

Dimitrios-Evangelos Miliordos; Myrto Tsiknia; Nikolaos Kontoudakis; Maria Dimopoulou; Costas Bouyioukos; Yorgos Kotseridis. Impact of Application of Abscisic Acid, Benzothiadiazole and Chitosan on Berry Quality Characteristics and Plant Associated Microbial Communities of Vitis vinifera L var. Mouhtaro Plants. Sustainability 2021, 13, 5802 .

AMA Style

Dimitrios-Evangelos Miliordos, Myrto Tsiknia, Nikolaos Kontoudakis, Maria Dimopoulou, Costas Bouyioukos, Yorgos Kotseridis. Impact of Application of Abscisic Acid, Benzothiadiazole and Chitosan on Berry Quality Characteristics and Plant Associated Microbial Communities of Vitis vinifera L var. Mouhtaro Plants. Sustainability. 2021; 13 (11):5802.

Chicago/Turabian Style

Dimitrios-Evangelos Miliordos; Myrto Tsiknia; Nikolaos Kontoudakis; Maria Dimopoulou; Costas Bouyioukos; Yorgos Kotseridis. 2021. "Impact of Application of Abscisic Acid, Benzothiadiazole and Chitosan on Berry Quality Characteristics and Plant Associated Microbial Communities of Vitis vinifera L var. Mouhtaro Plants." Sustainability 13, no. 11: 5802.

Preprint content
Published: 05 February 2019
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There is a renewed interest in recent years on the ecological processes (stochastic vs selective) driving the assembly of microbial communities. Such information could potentially improve our understanding on ecosystem functioning and resilience to disturbances, ecosystem response to environmental shifts, and adoption of sustainable soil management practices. Herein, employing a suite of existing methodologies, we show that stochastic processes have an important role on the assembly of soil bacterial communities at a Mediterranean watershed. Moreover, we document that the relative contribution of assembly processes varies over the years. The observed intensification of stochastic processes was accompanied by a decrease in the contribution of variable selection in favor of homogeneous selection and dispersal and this trend was only marginally affected by land use (natural vs agricultural lands) or soil depth. Our study also revealed a high inter-annual turnover of soil microbial communities that was likely stimulated by the weak environmental selection and the prevailing environmental conditions (drying-wetting cycles) in Mediterranean landscapes, implying potential impacts on ecosystem functioning and our ability to predict soil response to environmental shifts. Using nitrogen mineralization rate (NMR) as a representative function we document highly variable NMR over the sampling years, land uses and soil depths and lack of significant associations with the monitored environmental variables and individual taxa. In summary, our study provides novel insights on the organization and functioning of microbial communities at Mediterranean ecosystems and sets directions towards a more advanced understanding of the relationships among environmental factors, microbial community structure, and ecosystem functioning that could contribute to sustainable management of these severely degraded ecosystems.

ACS Style

Myrto Tsiknia; Stilianos Fodelianakis; Nikolaos P. Nikolaidis; Nikolaos V. Paranychianakis. Neutral processes and high inter-annual turnover shape the assembly of soil bacterial communities in a Mediterranean watershed. 2019, 542076 .

AMA Style

Myrto Tsiknia, Stilianos Fodelianakis, Nikolaos P. Nikolaidis, Nikolaos V. Paranychianakis. Neutral processes and high inter-annual turnover shape the assembly of soil bacterial communities in a Mediterranean watershed. . 2019; ():542076.

Chicago/Turabian Style

Myrto Tsiknia; Stilianos Fodelianakis; Nikolaos P. Nikolaidis; Nikolaos V. Paranychianakis. 2019. "Neutral processes and high inter-annual turnover shape the assembly of soil bacterial communities in a Mediterranean watershed." , no. : 542076.