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Heba Hassan
Botany Department, Faculty of Science, Ain Shams University, Cairo 11566, Egypt

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Journal article
Published: 23 July 2021 in Genes
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To assess the effect of triacontanol (TRIA) on rice plants grown under normal or drought conditions, rice seeds were presoaked in TRIA (35 ppm) for two hours. After 20 days of sowing, rice seedlings developed from TRIA-treated or untreated seeds were subjected to drought stress. After 10 days of plant exposure to drought stress, data of major growth attributes and the content of photosynthetic pigments were recorded. Moreover, the effect of drought stress on stomatal conductance and the photochemical efficiency of PSII (Fv/Fm) were followed. The data obtained indicated that the species of rice (Oryza sativa L.) cultivar Giza 177 under investigation was sensitive to drought stress where there were significant decreases in the fresh and dry weights of shoots and roots and in stomatal conductance, as well as in the content of chlorophyll a, chlorophyll b, and carotenoids. Seed priming with TRIA enhanced both growth and acquired plant tolerance to drought stress. Thus, TRIA via the enhancement of stomatal conductance through the regulation of stomatal closure, the rate of water loss, ABA metabolism, the accumulation of osmolytes, and the regulation of aquaporins genes improved the water status of plants grown under water scarcity. Moreover, TRIA via increasing the content of free amino acids and sugars under drought stress may increase the chance of plant tissues to retain more water under scarcity conditions.

ACS Style

Basmah Alharbi; Awatif Abdulmajeed; Heba Hassan. Biochemical and Molecular Effects Induced by Triacontanol in Acquired Tolerance of Rice to Drought Stress. Genes 2021, 12, 1119 .

AMA Style

Basmah Alharbi, Awatif Abdulmajeed, Heba Hassan. Biochemical and Molecular Effects Induced by Triacontanol in Acquired Tolerance of Rice to Drought Stress. Genes. 2021; 12 (8):1119.

Chicago/Turabian Style

Basmah Alharbi; Awatif Abdulmajeed; Heba Hassan. 2021. "Biochemical and Molecular Effects Induced by Triacontanol in Acquired Tolerance of Rice to Drought Stress." Genes 12, no. 8: 1119.

Journal article
Published: 26 January 2021 in Horticulturae
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Photosystem II is extremely susceptible to environmental alterations, particularly high temperatures. The maintenance of an efficient photosynthetic system under stress conditions is one of the main issues for plants to attain their required energy. Nowadays, searching for stress alleviators is the main goal for maintaining photosynthetic system productivity and, thereby, crop yield under global climate change. Potassium silicate (K2SiO3, 1.5 mM) and silicon dioxide nanoparticles (SiO2NPs, 1.66 mM) were used to mitigate the negative impacts of heat stress (45 °C, 5 h) on wheat (Triticum aestivum L.) cv. (Shandawelly) seedlings. The results showed that K2SiO3 and SiO2NPs diminished leaf rolling symptoms and electrolyte leakage (EL) of heat-stressed wheat leaves. Furthermore, the maximum quantum yield of photosystem II (Fv/Fm) and the performance index (PIabs), as well as the photosynthetic pigments and organic solutes including soluble sugars, sucrose, and proline accumulation, were increased in K2SiO3 and SiO2NPs stressed leaves. At the molecular level, RT-PCR analysis showed that K2SiO3 and SiO2NPs treatments stimulated the overexpression of PsbH, PsbB, and PsbD genes. Notably, this investigation indicated that K2SiO3 was more effective in improving wheat thermotolerance compared to SiO2NPs. The application of K2SiO3 and SiO2NPs may be one of the proposed approaches to improve crop growth and productivity to tolerate climatic change.

ACS Style

Hemmat Khattab; Aishah Alatawi; Awatif Abdulmajeed; Manal Emam; Heba Hassan. Roles of Si and SiNPs in Improving Thermotolerance of Wheat Photosynthetic Machinery via Upregulation of PsbH, PsbB and PsbD Genes Encoding PSII Core Proteins. Horticulturae 2021, 7, 16 .

AMA Style

Hemmat Khattab, Aishah Alatawi, Awatif Abdulmajeed, Manal Emam, Heba Hassan. Roles of Si and SiNPs in Improving Thermotolerance of Wheat Photosynthetic Machinery via Upregulation of PsbH, PsbB and PsbD Genes Encoding PSII Core Proteins. Horticulturae. 2021; 7 (2):16.

Chicago/Turabian Style

Hemmat Khattab; Aishah Alatawi; Awatif Abdulmajeed; Manal Emam; Heba Hassan. 2021. "Roles of Si and SiNPs in Improving Thermotolerance of Wheat Photosynthetic Machinery via Upregulation of PsbH, PsbB and PsbD Genes Encoding PSII Core Proteins." Horticulturae 7, no. 2: 16.