High potassium aggravates the oxidative stress inducedy by magnesium deficiency in rice leaves

文献类型： 外文期刊

第一作者： Ding Yu-Chuan

作者： Ding Yu-Chuan;Chang Chun-Rong;Luo Wen;Wu Yan-Shou;Ren Xiao-Li;Wang Ping;Xu Guo-Hua;Ding Yu-Chuan;Xu Guo-Hua;Chang Chun-Rong

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关键词： oxidative stress;photosynthesis

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

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收录情况： SCI

摘要： Magnesium (Mg) deficiency in plant affects photosynthesis and many other metabolic processes. Rice (Oryza sativa L. cv. 'Wuyunjing 7') plants were grown in hydroponics culture at three Mg and two potassium (K) levels under greenhouse conditions to examine the induction of oxidative stress and consequent antioxidant responses in rice leaves due to Mg deficiency. At low Mg (0.2 mmol L-1 Mg supply for two weeks after transplanting) and high K (6 mmol L-1) for 21 days, the rice plants showed severe Mg deficiency and a significant decreases in the dry matter production. The Mg deficiency in leaves decreased chlorophyll concentrations, photosynthetic activity, and soluble protein, but significantly increased the concentrations of soluble sugars and malondialdehyde (MDA) and the activities of superoxide dismutase (SOD, EC 1.15.1.1), catalase (CAT, EC 1.11.1.6) and peroxidase (POD, EC 1.11.1.7). In addition, Mg concentrations in the leaves and in the shoot biomass were negatively related to the activities of the three antioxidative enzymes and the concentration of MDA in leaves. There were very significant interactive effects between Mg and K supplied in the culture solution on shoot biomass yield, chlorophyll content, photosynthesis rate, the activities of SOD, CAT and POD, and MDA content in the leaves of rice. It is suggested that the high K level in the nutrient solution aggravated the effect of low Mg supply-induced Mg deficiency and created the oxidative damage in rice plants.

分类号： S15

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