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Effect of illimination on superoxide dismutase activity of etiolated maize seedling

Guo Zhenfei, Fan Jianming, Lu Shaoyun, Li Baosheng, Li Mingqi

College of Biotechnology,South China Agricultural University.Guangzhou 510642,Guangdong

Abstract

During the germination of maize seeds in the dark, superoxide dismutase (SOD) activity increased. Illumination with a light of low intensity (80 #mu#mol m~(-2) s~(-1)) caused an increased in SOD activity, which was abolished by actidione. An increase of O~(.)_(2) production rate caused by illumination in etiolated maize seedlings was observed. Paraquat (0.01 mmol/L) increased the SOD activity of maize seedlings both under illumination and in the dark. The light activation was relieved by treatment with active oxygen scavengers, ascorbate and mannitol. These results demonstrate that illumination induced the accumulation of O~(.)_(2) and thereby promoted SOD de novo synthesis in etiolated maize seedlings.

Key words: Superoxide dismutase;Illumination;Etiolated seedling;Maize

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Citing This Article：

Guo Zhenfei, Fan Jianming, Lu Shaoyun, Li Baosheng, Li Mingqi. Effect of illimination on superoxide dismutase activity of etiolated maize seedling. Acta Physiol Sin 1997; 49 (3): (in Chinese with English abstract).