Interactive effects of cadmium and aluminium on growth and antioxidative enzymes in soybean
2008
Shamsi, I.H.,Zhejiang Univ., Hangzhou (China). Dept. of Agronomy | Wei, K.,Zhejiang Univ., Hangzhou (China). Dept. of Agronomy | Zhang, G.P.,Zhejiang Univ., Hangzhou (China). Dept. of Agronomy | Jilani, G.H.,Zhejiang Univ., Hangzhou (China). Coll. of Environmental and Resource Sciences | Hassan, M.J.,Zhejiang Univ., Hangzhou (China). Dept. of Agronomy
The effects of Al, Cd and pH on growth, photosynthesis, malondialdehyde (MDA) content, and some antioxidant enzyme activities of the two soybean cultivars with different Al tolerance were determined using a hydroponic culture. Six treatments were used as follows: pH 6.5; pH 4.0; pH 6.5 + 1.0 microM Cd; pH 4.0 + 1.0 microM Cd; pH 4.0 + 150 microM Al; pH 4.0 + 1.0 microM Cd + 150 microM Al. The results showed that the low pH (4.0) and Al treatments caused marked reduction in the growth (root and shoot length and dry mass), chlorophyll content and net photosynthetic rate. Higher malondialdehyde content, superoxide dismutase (SOD) and peroxidase (POD) activities were detected in the plants exposed to both Al and Cd than in those exposed to Al treatment alone. An expressive enhancement of SOD and POD was observed in the plants exposed to 150 microM Al in the comparison with the control plants, especially in Al-sensitive cv. Zhechun 2 which had also significantly higher Al and Cd content than Al tolerant cv. Liao-1. Cd addition increased Al content in the plants exposed to Al + Cd stress, cv. Zhechun 2 had relatively lower Al content. The present research indicated that Al and Cd are synergistic in their effects on plant growth and some physiological traits.
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