Effects of NaCl and silicon on ion distribution in the roots, shoots and leaves of two alfalfa cultivars with different salt tolerance(Plant Nutrition)
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概要
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The effects of exogenous NaCl and silicon on ion distribution were investigated in two alfalfa (Medicago sativa. L.) cultivars: the high salt tolerant Zhongmu No. 1 and the low salt tolerant Defor. The cultivars were grown in a hydroponic system with a control (that had neither NaCl nor Si added), a Si treatment (1 mmol L^<-1> Si), a NaCl treatment (120 mmol L^<-1> NaCl), and a Si and NaCl treatment (120 mmol L^<-1> NaCl + 1 mmol L^<-1> Si). After 15 days of the NaCl and Si treatments, four plants of the cultivars were removed and divided into root, shoot and leaf parts for Na^+, K^+, Ca^<2+>, Mg^<2+>, Fe^<3+>, Mn^<2+>, Cu^<2+> and Zn^<2+> content measurements. Compared with the NaCl treatment, the added Si significantly decreased Na^+ content in the roots, but notably increased K^+ contents in the shoots and leaves of the high salt tolerant Zhongmu No.1 cultivar. Applying Si to both cultivars under NaCl stress did not significantly affect the Fe^<3+>, Mg^<2+> and Zn^<2+> contents in the roots, shoots and leaves of Defor and the roots and shoots of Zhongmu No.1, but increased the Ca^<2+> content in the roots of Zhongmu No.1 and the Mn^<2+> contents in the shoots and leaves of both cultivars, while it decreased the Ca^<2+> and Cu^<2+> contents of the shoots and leaves of both cultivars under salt stress. Salt stress decreased the K^+, Ca^<2+>, Mg^<2+> and Cu^<2+> contents in plants, but significantly increased Zn^<2+> content in the roots, shoots and leaves and Mn^<2+> content in the shoots of both cultivars when Si was not applied. Thus, salt affects not only the macronutrient distribution but also the micronutrient distribution in alfalfa plants, while silicon could alter the distributions of Na^+ and some trophic ions in the roots, shoots and leaves of plants to improve the salt tolerance.
- 社団法人日本土壌肥料学会の論文
著者
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Wang Xiao
Department of Medical Microbiology, Shandong University School of Medicine
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Han Jian
Department Of Grassland Science College Of Animal Science And Technology China Agricultural Universi
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Wang Xiao
Department Of Grassland Science College Of Animal Science And Technology China Agricultural Universi
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Wang Xiao
Department Of Applied Physics And Materials Research Center The Hong Kong Polytechnic University
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Wang Xiao
Department Of Aeronautical Engineering Nagoya University
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