Effect of Lanthanum on Rice Growth and Physiological Parameters with Split-Root Nutrient Solution Culture
来源期刊：JOURNAL OF RARE EARTHS2003年第1期
论文作者：高人 朱建国 曾青 曹志洪 张雅丽 谢祖彬 褚海燕
Key words：plant physiology; physiological parameters; split-root solution culture; lanthanum; rare earths;
Abstract: Split-root solution culture was used to study the promoting effect of lanthanum on rice (Oryza sativa) growth and its physiological mechanisms. Results show that low concentration (0.05～1.5 mg*L-1) increases rice yield and grain numbers. High concentration depresses grain formation (9～30 mg*L-1) and root elongation (1.5～30 mg*L-1). No significant influence on straw dry weight was found over the whole concentration range except the 0.05 mg*L-1 treatment. With the increase of La concentration from 0.05 to 0.75 mg*L-1, catalase (CAT) activity in the first fully expandeing leaves and roots decreases. When La concentration is greater than 0.75 mg*L-1 or less than 9 mg*L-1, it significantly decreases superoxide dismutase activity (SOD) in the leaves and roots. No significant effects were found on chlorophyll, protein and malondialdehyde (MDA) content. Possible mechanisms of La′s promoting effect on rice growth and reduction effect of *O-2 were discussed.
高人1，朱建国1，曾青1，曹志洪1，张雅丽1，谢祖彬1，褚海燕1
(1.Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China)
Abstract:Split-root solution culture was used to study the promoting effect of lanthanum on rice (Oryza sativa) growth and its physiological mechanisms. Results show that low concentration (0.05～1.5 mg*L-1) increases rice yield and grain numbers. High concentration depresses grain formation (9～30 mg*L-1) and root elongation (1.5～30 mg*L-1). No significant influence on straw dry weight was found over the whole concentration range except the 0.05 mg*L-1 treatment. With the increase of La concentration from 0.05 to 0.75 mg*L-1, catalase (CAT) activity in the first fully expandeing leaves and roots decreases. When La concentration is greater than 0.75 mg*L-1 or less than 9 mg*L-1, it significantly decreases superoxide dismutase activity (SOD) in the leaves and roots. No significant effects were found on chlorophyll, protein and malondialdehyde (MDA) content. Possible mechanisms of La′s promoting effect on rice growth and reduction effect of *O-2 were discussed.
Key words:plant physiology; physiological parameters; split-root solution culture; lanthanum; rare earths;
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