[SO2-caused oxidative stress and modulation of some signal molecules in wheat].
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 microl x 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 microl x 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 x L(-1) salicylic acid (SA) for 6 h or with 10 mmol x 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.
Hao
Lin
L
Department of Biology, Shenyang Normal University, China. haolinwj2001@yahoo.com.cn
Zhang
Huiwen
H
Xu
Xin
X
Tao
Siyuan
S
Yu
Long
L
D002374:Catalase / Q000378:metabolism; D005030:Ethylenes / Q000494:pharmacology; D018384:Oxidative Stress; D010544:Peroxidases / Q000378:metabolism; D018515:Plant Leaves / Q000378:metabolism; D020156:Salicylic Acid / Q000494:pharmacology; D036226:Seedlings / Q000187:drug effects; D015398:Signal Transduction; D013458:Sulfur Dioxide / Q000494:pharmacology*; D013482:Superoxide Dismutase / Q000378:metabolism; D014908:Triticum / Q000187:drug effects / Q000254:growth & development*
D005030:Ethylenes; D013458:Sulfur Dioxide; C036216:ethylene; D010544:Peroxidases; D002374:Catalase; D013482:Superoxide Dismutase; D020156:Salicylic Acid