应用生态学报2013，Vol.24Issue(1)：129-134,6.
外源脯氨酸对镉胁迫下小麦幼苗生长的影响
Effects of exogenous proline on the growth of wheat seedlings under cadmium stress
摘要
Abstract
Taking high protein wheat variety 'Beinong 9549' as test material, this paper studied the effects of foliage-spraying different concentration (0, 1.0, 5.0 and 10.0 mmol·L-1 ) proline on the growth and heavy metal uptake of wheat seedlings under cadmium stress. Under the stress of 1.0 mmol·L-1 of CdCl2, the root length, plant height and dry mass, leaf chlorophyll a and b and carotenoid contents of the seedlings decreased significantly by 24. 0% , 15.0% , 27. 5% , 23. 3% , 6.7% and 30. 8%, respectively, the leaf superoxide dismutase (SOD) activity decreased by 18.4% , the leaf proline, ascorbic acid and malondialdehyde (MDA) contents and the membrane permeability increased significantly by 78. 6% , 31. 5% , 17. 9% and 24. 8% , respectively, the leaf peroxidase (POD) activity was 2.4 folds higher, and the Cu uptake was promoted while the Zu absorption was inhibited, compared with the control. With the increasing concentration of sprayed proline, the root length, plant height and dry mass, and leaf chlorophyll a and b and carotenoid contents increased gradually to the levels of the control, the leaf proline and ascorbic acid contents and the leaf SOD activity increased, the leaf soluble protein content decreased after an initial in-crease , the leaf POD activity, MDA content and membrane permeability decreased, and the Zn ac-cumulation increased while the Cd and Cu accumulation decreased. In sum, foliage-spraying pro-line could alleviate the cadmium stress on the growth of wheat seedlings, and spraying 5. 0-10. 0 mmol·L-1 of proline could obtain the best effect.关键词
脯氨酸/镉胁迫/重金属/小麦Key words
proline/cadmium stress/heavy metal/wheat分类
农业科技引用本文复制引用
宋敏,徐文竞,彭向永,孔繁华..外源脯氨酸对镉胁迫下小麦幼苗生长的影响[J].应用生态学报,2013,24(1):129-134,6.基金项目
曲阜师范大学青年基金项目(XJ201109)和校地联合横向课题(00-34749)资助 （XJ201109）
