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首页> 外文期刊>Acta Horticulturae >Effects of glutathione on chloroplast membrane fluidity and the glutathione circulation system in young loquat fruits under low temperature stress.
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Effects of glutathione on chloroplast membrane fluidity and the glutathione circulation system in young loquat fruits under low temperature stress.

机译：谷胱甘肽对低温胁迫下lo幼果叶绿体膜流动性和谷胱甘肽循环系统的影响。

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摘要

The effects and mechanisms of exogenous glutathione (GSH) on cold stress in young loquat (Eriobotrya japonica Lindl.) fruits were investigated in this study. Three-year-old 'Zaozhong No. 6' loquat seedlings were foliar-sprayed with 50, 100 and 300 mg.L-1 GSH, subjected to -3 degrees C stress for 6 h, and cultured at 25 degrees C for 10 h. Low temperature stress inhibited glutathione peroxidase (GPX), glutathione-S-trasferase (GST) and glutathione reductase (GR) activity, and decreased GSH and membrane fluidity activity in young loquat fruit chloroplasts. Low temperature stress exacerbated damage to membrane lipid peroxidation, and destroyed anti-oxidation system function. The study found that treatment with certain concentrations of GSH decreased malondialdehyde (MDA) and H2O2 levels in young loquat fruit chloroplasts under low temperature stress. In addition, membrane fluidity and GPX, GST, GR activity, and GSH concentration were elevated. The study demonstrated that treatment with exogenous GSH increased GPX, GST, and GR activities, promoted GSH circulation and regeneration, reduced the degree of chloroplast membrane lipid peroxidation, and increased chloroplast membrane fluidity in young loquat fruit chloroplasts. Consequently, cold temperature resistance was increased in young loquat fruits with an optimal GSH dosage of 100 mg.L-1.
机译：研究了外源谷胱甘肽（GSH）对young幼果冷胁迫的影响及其机理。以50、100和300 mg.L -1 GSH叶面喷施3岁的“枣中6号” lo苗，并在-3摄氏度下进行6 h的培养。在25摄氏度10小时。低温胁迫抑制了lo幼果叶绿体中的谷胱甘肽过氧化物酶（GPX），谷胱甘肽-S-转移酶（GST）和谷胱甘肽还原酶（GR）活性，并降低了谷胱甘肽和膜流动性。低温胁迫加剧了对膜脂质过氧化的损害，并破坏了抗氧化系统的功能。研究发现，低温胁迫下，一定浓度的谷胱甘肽处理可降低young幼果叶绿体中的丙二醛和H 2 O 2 水平。另外，膜流动性和GPX，GST，GR活性和GSH浓度升高。研究表明，外源谷胱甘肽处理可增加young幼果叶绿体中的GPX，GST和GR活性，促进GSH循环和再生，降低叶绿体膜脂质过氧化程度，并增加叶绿体膜流动性。因此，with的最佳GSH剂量为100 mg.L -1 可以提高young幼果的耐寒性。

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