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Potassium-Induced Regulation of Cellular Antioxidant Defense and Improvement of Physiological Processes in Wheat under Water Deficit Condition

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Phyton-International Journal of Experimental Botany 2021年第2期90卷 353-372页

作者： Abdul Awal Chowdhury Masud mdfazlul karim M.H.M.Borhannuddin Bhuyan Jubayer Al Mahmud Kamrun Nahar Masayuki Fujita Mirza Hasanuzzaman Department of Agronomy Sher-e-Bangla Agricultural UniversityDhaka1207Bangladesh Citrus Research Center Bangladesh Agricultural Research InstituteJaintapur3156Bangladesh Department of Agroforestry and Environmental Science Sher-e-Bangla Agricultural UniversityDhaka1207Bangladesh Department of Agricultural Botany Sher-e-Bangla Agricultural UniversityDhaka1207Bangladesh Laboratory of Plant Stress Responses Department of Applied Biological SciencesKagawa UniversityKagawa761-0795Japan

Drought is the most common form of abiotic stress that reduces plant growth and *** causes plant injuries through elevated production of reactive oxygen species(ROS).Potassium(K)is a vital plant nutrient that notably ameliorates the detrimental effect of drought stress in the plant.A pot experiment was conducted at the Laboratory of Plant Stress Responses,Faculty of Agriculture,Kagawa University,Japan,under controlled environment of green house to explore the role of K in mitigating drought severity in wheat(Triticum asevitum L.)*** days after germination,seedlings were exposed to three water regimes viz.,100,50,and 20%field capacity(FC)for 21 *** was adjusted in Hoagland nutrient solution at 0,6 and 12 mM concentration and applied to pot instead of normal *** show that,water deficit stress notably reduced plant growth,biomass accumulation,leaf relative water content(RWC)along with reduced photosynthetic *** amount of biochemical stress markers viz.,malondialdehyde(MDA),hydrogen peroxide(H_(2)O_(2)),methylglyoxal(MG),proline(Pro)as well as an impaired antioxidant defense system were observed in drought affected wheat *** the contrary,K supplementation resulted in improvement of biochemical and physiological parameters that worked behind in improving growth and development of the wheat *** addition,enzymes of ascorbateglutathione(AsA-GSH)cycle were also enhanced by supplemented K that accelerated the ROS detoxification process in *** glyoxalse system did not performed well till MG was detoxified might following another short stepped *** results revealed that drought stressed plants showed better performances in terms of biochemical and physiological attributes,antioxidant defense and glyoxalase system,as well as ROS detoxification due to K supplementation with better performance at 12 mM K added in 50%FC growing condition.

关键词： Abiotic stress drought plant nutrient relative water content reactive oxygen species antioxidant H_(2)O_(2) methylglyoxal

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