Glycinebetaine mitigates tomato chilling stress by maintaining high-cyclic electron flow rate of photosystem I and stability of photosystem II

文献类型： 外文期刊

第一作者： Wei, Dandan

作者： Wei, Dandan;Zhang, Tianpeng;Zhang, Huiling;Ma, Mingyang;Li, Shufen;Liu, Yang;Yang, Xinghong;Wei, Dandan;Wang, Bingquan;Chen, Tony H. H.;Brestic, Marian

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关键词： Glycinebetaine; Photosynthesis; Photosystem I; Photosystem II; Cyclic electron transport; Chilling stress; Tomato

期刊名称：PLANT CELL REPORTS （ 影响因子：4.964； 五年影响因子：5.004 ）

ISSN： 0721-7714

年卷期： 2022 年 41 卷 4 期

页码：

收录情况： SCI

摘要： Key message Glycinebetaine alleviates chilling stress by protecting photosystems I and II inBADH-transgenic and GB-treated tomato plants, which can be an effective strategy for improving crop chilling tolerance. Tomato (Solanum lycopersicum) is one of the most cultivated vegetables in the world, but is highly susceptible to chilling stress and does not naturally accumulate glycinebetaine (GB), one of the most effective stress protectants. The protective mechanisms of GB on photosystem I (PSI) and photosystem II (PSII) against chilling stress, however, remain poorly understood. Here, we address this problem through exogenous GB application and generation of transgenic tomatoes (Moneymaker) with a gene encoding betaine aldehyde dehydrogenase (BADH), which is the key enzyme in the synthesis of GB, from spinach. Our results demonstrated that GB can protect chloroplast ultramicrostructure, alleviate PSII photoinhibition and maintain PSII stability under chilling stress. More importantly, GB increased the electron transfer between Q(A) and Q(B) and the redox potential of Q(B) and maintained a high rate of cyclic electron flow around PSI, contributing to reduced production of reactive oxygen species, thereby mitigating PSI photodamage under chilling stress. Our results highlight the novel roles of GB in enhancing chilling tolerance via the protection of PSI and PSII in BADH transgenic and GB-treated tomato plants under chilling stress. Thus, introducing GB-biosynthetic pathway into tomato and exogenous GB application are effective strategies for improving chilling tolerance.

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