24-Epibrassinolide Alleviates Aluminum Toxicity by Improving Leaf Chlorophyll Fluorescence and Photosynthetic Performance and Root Antioxidant-Oxidant Balance and Ascorbate-Glutathione Cycle in Maize
文献类型： 外文期刊
第一作者： Zhao, X. Q.
作者： Zhao, X. Q.;Shi, J.;Niu, Y. N.;Lu, P. N.;Mao, T. T.;Chen, X. J.
作者机构：
关键词： Zea mays; maize; aluminum stress; 24-epibrassinolide; chlorophyll fluorescence; photosynthetic performance; antioxidant system; ascorbate-glutathione cycle; phytohormone signal; RT-qPCR
期刊名称：RUSSIAN JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：1.419； 五年影响因子：1.636 ）
ISSN： 1021-4437
年卷期： 2022 年 69 卷 5 期
页码：
收录情况： SCI
摘要： Aluminum (Al) is a major environmental stress that limits crop growth and production. 24-Epibrassinolide (EBR) can control stress responses, but how it regulates Al homeostasis in Al-stressed maize seedlings is poorly understood. Therefore, seedlings of two lines of maize (Zea mays L.) under Al stress (60 mu M AlCl3) were treated with 1.0 x 10(-6) M EBR. In roots exposed to Al, EBR helped protect membranes and reduced reactive oxygen species by activating antioxidant enzymes, the ascorbate-glutathione cycle, phytohormone signal, and proline accumulation. In leaves under Al stress, EBR increased photosynthetic performance by protecting chloroplast ultrastructure, increasing ribulose 1,5-biphosphate carboxylase activity, and improving gas exchange. With EBR, inhibiting photoinhibition and promoting photosystem II efficiency maximized chlorophyll fluorescence. Changes in expression levels of ten candidate genes associated with antioxidant enzymes, phytohormone signals, mitogen-activated protein kinase (MAPK) pathway, photosynthesis, and chlorophyll fluorescence were consistent with changes in physiological assays in maize seedlings in the different treatments. Therefore, EBR can help alleviate Al toxicity in maize by improving activity in multiple metabolic pathways.
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