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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Nitric oxide participates in the regulation of the ascorbate-glutathione cycle by exogenous jasmonic acid in the leaves of wheat seedlings under drought stress
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Nitric oxide participates in the regulation of the ascorbate-glutathione cycle by exogenous jasmonic acid in the leaves of wheat seedlings under drought stress

机译：一氧化氮参与干旱胁迫下小麦幼苗叶片中外源茉莉酸对抗坏血酸-谷胱甘肽循环的调节

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In this paper, we investigated whether nitric oxide (NO) participated in the regulation of the ascorbate-glutathione (AsA-GSH) cycle by exogenous jasmonic acid (JA) in the leaves of wheat seedlings under drought stress. The findings of our study showed that drought stress significantly enhanced the AsA-GSH cycle by upregulating the activities of ascorbate peroxidase (APX), glutathione reductase (GR), monodehydroascorbate reductase (MDHAR), and dehydroascorbate reductase (DHAR). Drought stress also markedly increased electrolyte leakage (EL), malondialdehyde (MDA) content, NO content, and significantly reduced the ratios of reduced ascorbate/dehydroascorbic acid (AsA/DHA) and reduced glutathione/oxidized glutathione (GSH/GSSG) compared with control. Exogenous JA significantly increased the above indicators, compared with drought stress alone. All these effects of JA were inhibited by pretreatment with NO scavenger 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO). Meanwhile, exogenous JA markedly decreased MDA content and electrolyte leakage of wheat leaves under drought stress. Pretreatment with cPTIO reversed the above effects of exogenous JA. Our findings indicated that NO induced by exogenous JA upregulated the activity of the AsA-GSH cycle and had important role in drought tolerance.
机译：本文研究了干旱胁迫下小麦幼苗叶片中一氧化氮（NO）是否参与外源茉莉酸（JA）对抗坏血酸-谷胱甘肽（AsA-GSH）循环的调控。我们研究的结果表明，干旱胁迫通过上调抗坏血酸过氧化物酶（APX），谷胱甘肽还原酶（GR），单脱氢抗坏血酸还原酶（MDHAR）和脱氢抗坏血酸还原酶（DHAR）的活性而显着延长了AsA-GSH循环。与对照相比，干旱胁迫还显着增加了电解质渗漏（EL），丙二醛（MDA）含量，NO含量，并显着降低了抗坏血酸/脱氢抗坏血酸（AsA / DHA）还原率和谷胱甘肽/氧化型谷胱甘肽（GSH / GSSG）比率。与仅干旱胁迫相比，外源JA显着提高了上述指标。通过用NO清除剂2-（4-羧苯基）-4,4,5,5-四甲基咪唑啉-1-氧基1-3氧化物（cPTIO）预处理可抑制JA的所有这些作用。同时，外源JA显着降低了干旱胁迫下小麦叶片的MDA含量和电解质泄漏。用cPTIO预处理可以逆转外源JA的上述作用。我们的发现表明，外源JA诱导的NO上调了AsA-GSH循环的活性，并且在抗旱性中具有重要作用。

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