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Hydrogen sulfide: An emerging signaling molecule regulating drought stress response in plants

机译：硫化氢：调节植物中干旱胁迫反应的新出现的信号分子

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摘要

Hydrogen sulfide (H2S) is a small, reactive signaling molecule that is produced within chloroplasts of plant cells as an intermediate in the assimilatory sulfate reduction pathway by the enzyme sulfite reductase. In addition, H2S is also produced in cytosol and mitochondria by desulfhydration of l-cysteine catalyzed by l-cysteine desulfhydrase (DES1) in the cytosol and from beta-cyanoalanine in mitochondria, in a reaction catalyzed by beta-cyano-Ala synthase C1 (CAS-C1). H2S exerts its numerous biological functions by post-translational modification involving oxidation of cysteine residues (RSH) to persulfides (RSSH). At lower concentrations (10-1000 mu mol L-1), H2S shows huge agricultural potential as it increases the germination rate, the size, fresh weight, and ultimately the crop yield. It is also involved in abiotic stress response against drought, salinity, high temperature, and heavy metals. H2S donor, for example, sodium hydrosulfide (NaHS), has been exogenously applied on plants by various researchers to provide drought stress tolerance. Exogenous application results in the accumulation of polyamines, sugars, glycine betaine, and enhancement of the antioxidant enzyme activities in response to drought-induced osmotic and oxidative stress, thus, providing stress adaptation to plants. At the biochemical level, administration of H2S donors reduces malondialdehyde content and lipoxygenase activity to maintain the cell integrity, causes abscisic acid-mediated stomatal closure to prevent water loss through transpiration, and accelerates the photosystem II repair cycle. Here, we review the crosstalk of H2S with secondary messengers and phytohormones towards the regulation of drought stress response and emphasize various approaches that can be addressed to strengthen research in this area.
机译：硫化氢（H2S）是一种小的反应性信号分子，由亚硫酸盐还原酶在植物细胞叶绿体内产生，作为同化硫酸盐还原途径的中间产物。此外，在β-氰基阿拉合酶C1（CAS-C1）催化的反应中，细胞质和线粒体中的l-半胱氨酸由细胞质中的l-半胱氨酸脱硫酶（DES1）催化，线粒体中的β-氰基丙氨酸由β-氰基阿拉合酶C1催化。H2S通过将半胱氨酸残基（RSH）氧化为过硫化物（RSSH）的翻译后修饰发挥其多种生物学功能。在较低浓度（10-1000μmol L-1）下，H2S显示出巨大的农业潜力，因为它可以提高发芽率、大小、鲜重，并最终提高作物产量。它还参与对干旱、盐分、高温和重金属的非生物胁迫反应。H2S供体，例如硫化氢钠（NaHS），已被各种研究人员外源性地应用于植物，以提供耐旱性。外源施用导致多胺、糖、甘氨酸甜菜碱的积累，并增强抗氧化酶活性，以应对干旱诱导的渗透和氧化胁迫，从而为植物提供胁迫适应。在生化水平上，给予H2S供体可降低丙二醛含量和脂氧合酶活性，以维持细胞完整性，导致脱落酸介导的气孔关闭，以防止蒸腾失水，并加速光系统II修复周期。在这里，我们回顾了H2S与次级信使和植物激素在干旱胁迫反应调节中的相互作用，并强调了可以用来加强这一领域研究的各种方法。

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  • 来源
    《Physiologia plantarum》 |2021年第2期|共17页
  • 作者

    Thakur Meenakshi; Anand Anjali;

  • 作者单位

    Dr Yashwant Singh Parmar Univ Hort &

    Forestry Coll Hort &

    Forestry Hamirpur 177001 Himachal Prades India;

    ICAR Indian Agr Res Inst Div Plant Physiol New Delhi India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物生理学;
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