Salt and osmotic stress-induced changes in physio-chemical responses, PSII photochemistry and chlorophyll a fluorescence in peanut
Salt and osmotic stress-induced changes in physio-chemical responses, PSII photochemistry and chlorophyll a fluorescence in peanut
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DOI：
10.1016/j.stress.2022.100063
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发表时间：
2022-01-01
期刊：
影响因子：
5
通讯作者：
Rathore, Mangal S.
中科院分区：
文献类型：
--
作者：
Khatri, Kusum;Rathore, Mangal S.
花生（arachhis hypogaea L.）是干旱半干旱地区重要的经济作物。研究报道了盐度和渗透胁迫对花生光合机制和生理生化反应的影响。盐胁迫和渗透胁迫对花生的生长有不利影响。在胁迫条件下，生物分子的积累维持了渗透调节，有助于防止活性氧（ROS）积累造成的损伤。应激导致ROS生成，导致细胞过程破坏，最终导致光合作用减少。叶绿素a/b比值升高表明胁迫下花生PSII集光天线尺寸减小。胁迫下花生的φ (R-0)较低表明PSI受体侧功能低下。提示荧光显示了花生PSI受体侧电子传递链的损伤，其损伤程度与胁迫强度和持续时间有关。应力条件下延迟荧光的变化和非还原性反应中心的增加导致电子输运降低。δ VI-P和δ FI-P与PSI的PsaD蛋白相关，结果表明胁迫下花生的电子传递降低，ROS生成增加。在较高强度下，盐度和渗透胁迫诱导的光抑制降低了花生PSII光合速率、PSII电子传递量子产率和开放PSII RCs捕获激发能的效率。
Peanut (Arachis hypogaea L.) is an important cash crop in arid and semi-arid region. Study reports effects of salinity and osmatic stress on photosynthetic machinery along with physio-biochemical responses in peanut. Salt and osmotic stress negatively affected growth of peanut. Under stress condition, accumulations of biomolecules maintained osmotic adjustment and help to prevented damage due to reactive oxygen species (ROS) accumulation. Stress caused ROS generation, which caused destruction of cellular processes and ultimately resulted in reduced photosynthesis. The higher chlorophyll a/b ratio indicated the reduced size of PSII light-harvesting antenna in peanut under stress. Lower phi(R-0) in peanut under stress indicated inefficient functioning of PSI acceptor side. Prompt fluorescence indicated damages to electron transport chain at the PSI acceptor side in a stress strength and duration dependent manner in peanut. The change in delayed fluorescence under stress condition and increment in non-reducing reaction center results in lower electron transport. The delta VI-P and delta FI-P have been correlated with PsaD protein of PSI and the results indicated lower electron transport and higher ROS generation in peanut under stress. At higher strength, salinity and osmotic stress induced photo-inhibition, which in turn lowered the PSII photosynthetic yield, quantum yield of PSII electron transport and capturing efficiency of excitation energy by open PSII RCs in peanut.