| 谷胱甘肽对盐胁迫下玉米幼苗抗氧化特性和光合性能的影响 |
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| 引用本文：单长卷, 杨天佑.谷胱甘肽对盐胁迫下玉米幼苗抗氧化特性和光合性能的影响[J].西北农业学报,2017,(2):185~191 |
| DOI:10.7606/j.issn.1004-1389.2017.02.005 |
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| 基金项目:河南省高等学校重点科研项目计划资助（13A180302）。 |
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| 中文摘要:以80 mmol/L NaCl模拟盐胁迫，研究谷胱甘肽（GSH）对盐胁迫下‘滑玉14’幼苗叶片抗氧化特性和光合性能的影响。结果表明：盐胁迫显著提高叶片细胞质膜透性、丙二醛（MDA）质量摩尔浓度、抗氧化酶超氧化物歧化酶（SOD）、抗坏血酸氧化酶（APX）和脱氢抗坏血酸还原酶（DHAR）活性、抗氧化物质谷胱甘肽（GSH）和抗坏血酸（AsA）质量摩尔浓度及叶绿素荧光参数非光化学猝灭系数（qn），显著降低叶绿素荧光参数PSⅡ最大光化学效率（Fv/Fm）、光化学猝灭系数（qP）和PSⅡ实际量子产额（ΦPSⅡ），光合色素质量分数、光合速率和单株生物量干质量。这说明，盐胁迫对‘滑玉14’造成氧化胁迫，并对光系统Ⅱ的功能造成伤害。50 mg/L GSH处理则可以显著提高盐胁迫下玉米幼苗叶片过氧化物酶（POD）、SOD、谷胱甘肽还原酶（GR）活性、GSH质量摩尔浓度、Fv/Fm、qP和ΦPSⅡ、光合色素质量分数、光合速率和单株生物量干质量，并显著降低细胞质膜透性、MDA质量摩尔浓度和qn。上述研究结果说明，GSH处理可以提高玉米幼苗的抗氧化能力和光合性能，从而缓解盐胁迫造成的伤害。 |
| 中文关键词:玉米幼苗 抗氧化特性 光合性能 谷胱甘肽 盐胁迫 |
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| Effects of Glutathione on Antioxidant and Photosynthetic Properties of Maize Seedlings under Salt Stress |
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| Abstract:This study investigated the effects of glutathione(GSH) on antioxidant and photosynthetic properties of maize seedling under salt stress(80 mmol/L NaCl) with the material of ‘Huayu 14’. The results showed that salt stress significantly improved the membrane permeability, malondialdehyde(MDA) molality, the activities of superoxide dismutase(SOD), ascorbate oxidase(APX) and dehydroascorbate reductase(DHAR), the molalities of GSH and ascorbate(AsA), and chlorophyll fluorescence parameter non-photochemical quenching coefficient(qn). Meanwhile, salt stress significantly reduced chlorophyll fluorescence parameter PSⅡ photochemical efficiency(Fv/Fm), photochemical quenching coefficient(qP) and actual quantum yield of PSⅡ(ΦPSⅡ), the mass fractions of photosynthetic pigments, photosynthetic rate and dry mass per plant. These results suggested that salt stress induced oxidative stress to maize seedling and made damage to the function of photosystem Ⅱ. Adding 50 mg/L GSH significantly improved the activities of peroxidase(POD), SOD and glutathione reductase(GR), GSH molality, Fv/Fm, qP and ΦPSⅡ, the mass fractions of photosynthetic pigments, photosynthetic rate and dry mass per plant under salt stress. Besides, GSH could significantly reduce MDA molality and membrane permeability of leaves. Our results indicated that GSH could protect maize against salt stress by improving the antioxidant and photosynthetic properties of maize seedlings, which alleviated the injuries induced by salt stress. |
| keywords:Maize seedlings Antioxidant properties Photosynthetic properties Glutathione Salt stress |
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