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| Effects of Cadmium on Growth and Antioxidant Enzyme Activities of Two Kidney Bean(Phaseolus vulgaris L.)Cultivars |
| Received:September 14, 2014 |
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| KeyWord:cadmium stress;kidney bean;growth;root architecture;antioxidant enzymes |
| Author Name | Affiliation | E-mail | | LI Dong-qin | Key Laboratory of Tropical Agricultural Environment in South China, the Ministry of Agriculture, South China Agricultural University, Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, Guangzhou 510642, China | | | CHEN Gui-kui | Key Laboratory of Tropical Agricultural Environment in South China, the Ministry of Agriculture, South China Agricultural University, Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, Guangzhou 510642, China | | | ZHENG Hai | Key Laboratory of Tropical Agricultural Environment in South China, the Ministry of Agriculture, South China Agricultural University, Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, Guangzhou 510642, China | | | LI Hua-shou | Key Laboratory of Tropical Agricultural Environment in South China, the Ministry of Agriculture, South China Agricultural University, Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, Guangzhou 510642, China | lihuashou@scau.edu.cn | | LI Xiao-bing | Key Laboratory of Tropical Agricultural Environment in South China, the Ministry of Agriculture, South China Agricultural University, Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, Guangzhou 510642, China | |
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| Abstract: |
| Different genotypes of plants show various tolerances to and accumulation of heavy metals. Here a hydroponic experiment was conducted to investigate the effects of different concentrations of cadmium on plant height, biomass, root configuration, and antioxidant enzyme activities of two cultivars of kidney beans, viz. Texuan and Youxuan. Results showed that plant height, plant biomass, root length, total root surface area, average root diameter and total root volume were all significantly inhibited under cadmium stresses. The inhibitory effect of cadmium on Texuan kidney bean was greater than that of Youxuan kidney bean. Increasing cadmium concentrations increased malondialdehyde(MDA) contents and peroxidase(POD) activities of two cultivars. Superoxide dismutase(SOD) activity of two cultivars increased at low Cd concentrations, but decreased at high concentrations. Catalase(CAT) activity of Texuan kidney bean increased at low Cd concentrations whereas it decreased at high Cd concentrations. That of Youxuan kidney bean, however, increased with increasing cadmium concentrations. The variations in MDA contents, and SOD and CAT activities were greater for Texuan bean than Youxuan kidney bean, while that for the POD activity was just opposite. These results indicate that tolerance of Youxuan kidney bean to cadmium stress is much greater than that of Texuan kidney bean. |
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