当前位置: X-MOL 学术Russ. J. Plant Physiol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Exogenous Melatonin Improves Drought Tolerance in Maize Seedlings by Regulating Photosynthesis and the Ascorbate–Glutathione Cycle
Russian Journal of Plant Physiology ( IF 1.4 ) Pub Date : 2020-08-30 , DOI: 10.1134/s1021443720050064
Y. Y. Guo , H. J. Li , C. F. Zhao , J. Q. Xue , R. H. Zhang

Abstract

Melatonin is known to exert protective effects in maize against drought stress, but the knowledge regarding interaction among the melatonin, photosynthetic efficiency, ascorbate–glutathione cycle still remains elusive. Two contrasting maize (Zea mays L.) genotypes, SD609 (drought-tolerant) and SD902 (drought-sensitive), were subjected to moderate and severe drought stress along with 100 μM melatonin treatment. Exogenous melatonin increased fluorescence curve levels for both genotypes under drought stress, and higher in SD609 than SD902. In both genotypes, melatonin application also significantly increased the photochemical efficiency of photosystem II (PSII), the effective quantum yield of PSII and photosystem I (PSI), and the electron transport rate between PSII and PSI under drought stress, but it decreased the quantum yield of energy dissipation and the donor side and acceptor side impairment of PSI under drought stress, regardless of stress severity. Exogenous melatonin also contributed to the reduction of membrane damage under drought stress, as reflected by significantly decreased levels of MDA, superoxide anions and H2O2 of both genotypes exposed to drought. Furthermore, melatonin treatment increased enzyme activity in AsA–GSH cycle, and upregulated the genes expression of related enzymes in AsA–GSH cycle. The effects of melatonin were more pronounced in SD609 than SD902. Collectively, these results indicated that exogenous melatonin application increased photosynthetic electron transport rate and accelerated the AsA–GSH cycle, which are factors that play an important role in drought tolerance in maize. The beneficial effect of melatonin on the drought-tolerance SD609 was more obvious.



中文翻译:

外源褪黑素通过调节光合作用和抗坏血酸-谷胱甘肽循环来提高玉米幼苗的耐旱性

摘要

众所周知,褪黑激素在玉米中发挥抗干旱作用的保护作用,但是关于褪黑激素之间的相互作用,光合作用效率,抗坏血酸-谷胱甘肽循环的知识仍然难以捉摸。两种对比玉米(Zea mays)L.)基因型SD609(耐干旱)和SD902(干旱敏感)受到中度和重度干旱胁迫,并受到100μM褪黑素处理。外源褪黑激素增加了干旱胁迫下两种基因型的荧光曲线水平,并且在SD609中高于SD902。在这两种基因型中,褪黑激素的施用还显着提高了光系统II(PSII)的光化学效率,PSII和光系统I(PSI)的有效量子产率以及干旱胁迫下PSII和PSI之间的电子传输速率,但量子通量却降低了不论干旱严重程度如何,干旱胁迫下PSI的能量耗散率以及PSI的供体和受体侧受损。外源褪黑激素还有助于减少干旱胁迫下的膜损伤,两种基因型的2 O 2都暴露于干旱。此外,褪黑素处理增加了AsA–GSH周期中的酶活性,并上调了AsA–GSH周期中相关酶的基因表达。褪黑激素的作用在SD609中比在SD902中更为明显。总体而言,这些结果表明外源褪黑素的应用提高了光合电子的传输速率并加速了AsA–GSH循环,这是在玉米耐旱性中发挥重要作用的因素。褪黑激素对SD609耐旱性的影响更为明显。

更新日期:2020-08-30
down
wechat
bug