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高钾供应加剧了水稻叶片缺镁诱导的氧化胁迫
作者姓名:DING Yu-Chuan  CHANG Chun-Rong  LUO Wen  WU Yan-Shou  REN Xiao-Li  WANG Ping  XU Guo-Hua
作者单位:[1]State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Resources and Environmental Sciences,Nanjing Agricultural University, Nanjing 210095 (China). [2]Institute of Soil and Fertilizer, Shanxi Academy of Agricultural Sciences, Taiyuan 030031 (China) [3]Agronomy College, South China University of Tropical Agriculture, Danzhou 571737 (China)
基金项目:Project supported by the Dead Sea Works Ltd.,Israel.
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 malondialdchyde (MDA) and the activities of superoxide dismutase (SOLD, 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.

关 键 词:营养素  氧化应力  稻子  叶子
收稿时间:16 August 2007
修稿时间:8 January 2008. 

High potassium aggravates the oxidative stress induced by magnesium deficiency in rice leaves
DING Yu-Chuan,CHANG Chun-Rong,LUO Wen,WU Yan-Shou,REN Xiao-Li,WANG Ping,XU Guo-Hua.High potassium aggravates the oxidative stress induced by magnesium deficiency in rice leaves[J].Pedosphere,2008,18(3):316-327.
Authors:DING Yu-Chuan  CHANG Chun-Rong  LUO Wen  WU Yan-Shou  REN Xiao-Li  WANG Ping and XU Guo-Hua
Institution:

aState Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China)

bInstitute of Soil and Fertilizer, Shanxi Academy of Agricultural Sciences, Taiyuan 030031 (China)

cAgronomy College, South China University of Tropical Agriculture, Danzhou 571737 (China)

Abstract: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 21days,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.
Keywords:antioxidative enzymes  magnesium  nutrients interaction  Oryza sativa L    potassium
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