SO2-caused oxidative stress and modulation of some signal molecules in wheat

Abstract

Abstract: By adding different concentration SO₂ to culture boxes,this paper studied the responses of wheat seedling's superoxide anion radical O₂^-· and antioxidant enzymes to SO₂.The results showed that when the concentration of SO₂ was 10 and 40 μl·L^-1,the O₂^-· content and peroxidase (POD) and catalase(CAT) activities of wheat leaf were increased,while the activity of superoxide dismutase(SOD) was reduced.When the SO₂ concentration was 50 μl·L^-1,the activities of POD and CAT were decreased,with the top end leaves appeared necrosis,and more fungi multiplied on green leaves.Presoaking wheat seeds with 1 mmol·L^-1 salicylic acid (SA) for 6 h or with 10 mmol·L^-1 H₂O₂ for 12 h could efficiently alleviate the oxidative stress caused by SO₂,with the O₂^-· content decreased and the activities of test antioxidant enzymes increased.Under SO₂ fumigation,ethylene significantly inhibited the activities of test enzymes,and promoted the O₂^-· production rate.When applying SA and ethylene at the same time,SA could almost completely eliminate the influences of ethylene on O₂^-· production and test enzyme activities.

Key words: SO₂, Wheat, Salicylic acid, Ethylene, Hydrogen peroxide

CLC Number:

X171

HAO Lin, ZHANG Huiwen, XU Xin, TAO Siyuan, YU Long . SO₂-caused oxidative stress and modulation of some signal molecules in wheat[J]. Chinese Journal of Applied Ecology, 2005, 16(6): 1038-1042.

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SO₂-caused oxidative stress and modulation of some signal molecules in wheat

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