应用生态学报2009，Vol.20Issue(7)：1698-1704,7.
铝胁迫下水稻幼苗根系的生理特性
Physiological characteristics of rice seedlings roots under aluminum stress
摘要
Abstract
A hydroponic experiment was conducted with the four-leaf stage seedlings of aluminum (Al)-susceptible rice variety IR24 and Al-tolerant rice varieties Jingyou 725 and Liangyoupeijiu to study the physiological characteristics of the seedlings roots under effects of 0, 0.5 mmol·L-1, and 7.5 mmol·L-1 of Al. Under the stress of 7.5 mmol Al·L-1, Al-tolerant varieties had a far lesser decrement of root vigor than Al-susceptible variety, while the Al-susceptible variety had a higher root mitochondria H2O2 content than Al-tolerant varieties. Al stress induced a lesser increment of CAT activity in the root mitochondria of all tested varieties. With the increasing Al concentration, the root mitochondria POD activity of IR24 and Jingyou 725 decreased after an initial increase while that of Liangyoupeijiu was increasing, and the root mitochondria APX activity of IR24 decreased after an initial increase while that of Jingyou 725 and Liangyoupeijiu was increasing. The root glutamic acid content of all tested varieties showed an increase-decline trend, and their citric acid content decreased while PEP content increased. The ratio of cyanide-resistant respiration rate to total respiration rate of Al-tolerant Jingyou 725 and Liangyoupeijiu increased obviously, compared with that of Al-susceptible IR24.关键词
水稻/铝毒/线粒体活性氧/抗氧化酶/有机酸Key words
rice/ aluminum toxicity/ reactive oxygen species in mitochondria/ antioxidase/ organic acid.分类
农业科技引用本文复制引用
谢国生,师瑞红,庞贞武,蔡克桐..铝胁迫下水稻幼苗根系的生理特性[J].应用生态学报,2009,20(7):1698-1704,7.基金项目
国家自然科学基金项目(30370764)资助..E-mail: xiegsh@mail.hzau.edu.cn （30370764）
