Salt Priming Protects Photosynthetic Electron Transport against Low-Temperature-Induced Damage in Wheat
文献类型： 外文期刊
作者： Li, Hui 1 ; Li, Huawei 3 ; Lv, Yanjie 4 ; Wang, Yongjun 4 ; Wang, Zongshuai 3 ; Xin, Caiyun 5 ; Liu, Shengqun 1 ; Zhu, Xi 1 ;
作者机构： 1.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Mollisols Agroecol, Changchun 130102, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Shandong Acad Agr Sci, Crop Res Inst, Jinan 250100, Peoples R China
4.Jilin Acad Agr Sci, Inst Agr Resources & Environm, State Engn Lab Maize, Changchun 130033, Peoples R China
5.Shandong Acad Agr Sci, Rice Res Inst, 2 Sangyuan Rd, Jinan 250100, Peoples R China
6.Anhui Normal Univ, Coll Life Sci, Wuhu 241000, Peoples R China
关键词： reactive oxygen species; cold stress; Chlorophyll a fluorescence; PS II reaction centers
期刊名称：SENSORS （ 影响因子：3.576； 五年影响因子：3.735 ）
ISSN：
年卷期： 2020 年 20 卷 1 期
页码：
收录情况： SCI
摘要： Low temperature limits the photochemical efficiency of photosystems in wheat plants. To test the effect of salt priming on the photosynthetic electron transport in wheat under low temperature, the germinating seeds of a winter wheat cv. Jimai44 were primed with varying concentrations of NaCl solutions (0, 10, 30, and 50 mM NaCl, indicated by S0, S10, S30, and S50, respectively) for 6 d, and after 11 d of recovery, the seedlings were subsequently exposed to 24-h low-temperature stress (2 degrees C). Under low temperature, the S30 plants possessed the highest absorption flux per reaction center and higher density of reaction center per cross-section among the treatments. In addition, S30 plants had higher trapped energy flux for reducing Q(A) and fraction of Q(A)-reducing reaction centers and non-Q(B) reducing center than the non-primed plants under low temperature, indicating that S30 plants could maintain the energy balance of photosystems and a relatively higher maximum quantum efficiency of photosystem II under low temperature. In addition, the low temperature-induced MDA accumulation and cell death were alleviated by salt priming in S30 plants. It was suggested that salt priming with an optimal concentration of NaCl solution (30 mM) during seed germination enhanced the photochemical efficiency of photosystems in wheat seedlings, which could be a potential approach to improve cold tolerance in wheat at an early stage.
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