Induction of Drought Tolerance in Maize (Zea mays L.) due to Exogenous Application of Trehalose: Growth, Photosynthesis, Water Relations and Oxidative Defence Mechanism
Induction of Drought Tolerance in Maize (Zea mays L.) due to Exogenous Application of Trehalose: Growth, Photosynthesis, Water Relations and Oxidative Defence Mechanism
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DOI：
10.1111/j.1439-037x.2010.00463.x
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发表时间：
2011-08-01
影响因子：
3.5
通讯作者：
Ashraf, M.
中科院分区：
文献类型：
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作者：
Ali, Q.;Ashraf, M.
本研究旨在评估叶面喷施海藻糖对田间水分亏缺条件下两个玉米品种的生长、光合特性、水分相关参数和氧化防御机制的改善作用。实验的各个组成部分包括两个玉米品种（EV-1098和Agaiti-2002），两个水分胁迫水平（在整个生长期间2周后灌溉和3周后灌溉），两个海藻糖水平（0和30 mm）和每个处理的四个重复。水分胁迫显著降低了两个玉米品种的生物量生产、光合特性和水分关系参数。与此相反，水分胁迫显著增加了叶片丙二醛（MDA）含量，过氧化物酶（POD）、超氧化物歧化酶（SOD）和过氧化氢酶（CAT）等抗氧化酶的活性，以及抗坏血酸和生育酚等非酶物质的含量。相反，水分胁迫导致叶片酚类物质含量显着降低。叶面施用海藻糖显著提高了植物的生物量生产，并改善了一些关键的光合特性和植物-水分关系参数。外源海藻糖还对一些关键的抗氧化酶（POD和CAT）和非酶化合物（生育酚和酚类）的活性有改善作用。总体而言，外源海藻糖通过上调光合和水分关系属性以及抗氧化防御机制显著提高了玉米植株的耐旱性。
The present investigation was conducted to assess the ameliorative effects of foliar-applied trehalose on growth, photosynthetic attributes, water relation parameters and oxidative defence mechanism in two maize cultivars under field water deficit conditions. Various components of the experiment comprised two maize cultivars (EV-1098 and Agaiti-2002), two water-stress levels (irrigation after 2 weeks and irrigation after 3 weeks during the entire period of growth), and two levels of trehalose (0 and 30 mm) and four replicates of each treatment. Water stress significantly reduced the plant biomass production, photosynthetic attributes and water relation parameters in both maize cultivars. In contrast, water stress considerably increased the leaf malondialdehyde (MDA) contents, the activities of antioxidant enzymes such as peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT), and the levels of non-enzymatic compounds such as ascorbic acid and tocopherols. In contrast, water stress caused a marked reduction in leaf phenolic contents. Foliar-applied trehalose significantly increased plant biomass production, and improved some key photosynthetic attributes and plant-water relation parameters. The ameliorative effect of exogenously applied trehalose was also observed on the activities of some key antioxidant enzymes (POD and CAT) and non-enzymatic compounds (tocopherols and phenolics). Overall, exogenously applied trehalose considerably improved drought tolerance of maize plants by up-regulating photosynthetic and water relation attributes as well as antioxidant defence mechanism.