环境工程学报2009，Vol.3Issue(12)：2291-2296,6.
镉胁迫对向日葵幼苗生长和生理特性的影响
Effects of cadmium on the growth and physiological characteristics of sunflower seedlings
摘要
Abstract
A hydroponic culture experiment was conducted to study the effects of different concentrations of cadmium on the growth and physiological characteristics of sunflower seedlings. The seedlings were treated with 0,0. 05,0. 1,O. 5 and 1 mg/L cadmium for periods of 7 days. The results showed that the cadmium absorbed by sunflower seedlings significantly increased with the augmenting of cadmium concentrations. Specifically,the cadmium accumulated in leaves,stems and roots at 1 mg/L cadmium was 16. 3,19.2 and 581 times as much as at 0. 05 mg/L cadmium,respectively. In addition,cadmium concentrations in roots were 37.8～63 and 29.4～41 times more than that in leaves and stems. The growth and chlorophyll contents of sunflower seedlings were sig-nificantly inhibited by cadmium stress. As compared with control,when cadmium concentration reached 1 mg/L,the biomass of whole plants and total chlorophyll contents dropped to 55.9% and 52. 6%. However,cadmium addition increased the malonyldialdehyde (MDA) and free proline contents,and at 1 mg/L cadmium the contents in roots raised 3 and 4. 8 times as against the control. The inverted U-shaped dose-response effects of cadmium on soluble protein contents and the activities of peroxidase (POD) were observed,with maximum effects of soluble protein contents at 0. 05 mg/L cadmium,and at 0. 1,0. 1,0. 05 mg/L cadmium POD in leav-es,stems,roots attained maximum activities,respectively.关键词
镉/向日葵/生长/生理特性Key words
cadmium/sunflower seedlings/growth/physiological characteristics分类
农业科技引用本文复制引用
郭艳丽,台培东,韩艳萍,冯倩,李培军..镉胁迫对向日葵幼苗生长和生理特性的影响[J].环境工程学报,2009,3(12):2291-2296,6.基金项目
中国科学院陆地生态过程重点实验室基金资助 （）
国家自然科学基金面上项目资助(20977095) （20977095）
中国科学院知识创新工程重大项目(kzcxl-yw-06-03) （kzcxl-yw-06-03）
