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首页> 美国卫生研究院文献>International Journal of Molecular Sciences >Pretreatment with NaCl Promotes the Seed Germination of White Clover by Affecting Endogenous Phytohormones Metabolic Regulation and Dehydrin-Encoded Genes Expression under Water Stress
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Pretreatment with NaCl Promotes the Seed Germination of White Clover by Affecting Endogenous Phytohormones Metabolic Regulation and Dehydrin-Encoded Genes Expression under Water Stress

机译：NaCl预处理通过影响水分胁迫下的内源植物激素代谢调控和脱水素编码基因表达来促进白三叶草种子萌发

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This study was designed to examine the effects of NaCl pretreatment on the seed germination of white clover (Trifolium repens cv. Ladino) under water stress induced by 19% polyethylene glycol (PEG) 6000. Lower concentrations of NaCl (0.5, 1, and 2.5 mM) pretreatment significantly alleviated stress-induced decreases in germination percentage, germination vigor, germination index, and radicle length of seedlings after seven days of germination under water stress. The soaking with 1 mM of NaCl exhibited most the pronounced effects on improving seed germination and alleviating stress damage. NaCl-induced seeds germination and growth could be associated with the increases in endogenous gibberellic acid (GA) and indole-3-acetic acid (IAA) levels through activating amylases leading to improved amylolysis under water stress. Seedlings pretreated with NaCl had a significantly lower osmotic potential than untreated seedlings during seed germination, which could be related to significantly higher soluble sugars and free proline content in NaCl-treated seedlings under water stress. For antioxidant metabolism, NaCl pretreatment mainly improved superoxide dismutase, peroxidase, ascorbate peroxidase, and glutathione reductase activities, transcript levels of FeSOD, APX, and DHAR, and the content of ascorbic acid, reduced glutathione, and oxidized glutathione during seed germination under water stress. The results indicated that seeds soaking with NaCl could remarkably enhance antioxidant metabolism, thereby decreasing the accumulation of reactive oxygen species and membrane lipid peroxidation during germination under water stress. In addition, NaCl-upregulated dehydrin-encoded genes SK2 expression could be another important mechanism of drought tolerance during seeds germination of white clover in response to water stress.
机译：这项研究旨在研究在19％聚乙二醇（PEG）6000诱导的水分胁迫下，氯化钠预处理对白三叶草（Trifolium repens cv。Ladino）种子萌发的影响。较低浓度的氯化钠（0.5、1和2.5） mM）预处理显着缓解了水分胁迫下发芽7天后胁迫引起的幼苗发芽率，发芽势，发芽指数和胚根长度的下降。用1 mM的NaCl浸泡对改善种子发芽和减轻胁迫损害表现出最明显的作用。 NaCl诱导的种子发芽和生长可能与内源赤霉素（GA）和吲哚-3-乙酸（IAA）的水平升高有关，这是通过激活淀粉酶导致水分胁迫下改善的淀粉分解作用来实现的。用NaCl预处理的种子在发芽过程中的渗透势明显低于未处理的幼苗，这可能与NaCl处理的幼苗在水分胁迫下的可溶性糖和游离脯氨酸含量明显较高有关。对于抗氧化剂代谢，NaCl预处理主要改善种子在水分胁迫下发芽过程中的超氧化物歧化酶，过氧化物酶，抗坏血酸过氧化物酶和谷胱甘肽还原酶活性，FeSOD，APX和DHAR的转录水平以及种子萌发期间抗坏血酸，还原型谷胱甘肽和氧化型谷胱甘肽的含量。 。结果表明，NaCl浸种可以显着增强抗氧化代谢，从而减少水分胁迫下发芽过程中活性氧的积累和膜脂质过氧化。此外，NaCl上调的脱水素编码基因SK2表达可能是白三叶种子萌发期间响应水分胁迫的另一重要抗旱机制。

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