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《Chinese Journal of Ecology》 2014-07
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Physiological responses of Taxus chinensis var. mairei to SO_2 stress

SUN Ling-xia;ZHANG Jun-ming;CAI Shi-zhen;LI Xi;College of Landscape Architecture,Sichuan Agricultural University;  
In order to investigate the resistance mechanism of Taxus chinensis var. mairei to sulfur dioxide(SO2) pollution,one-year-old potted seedlings were grown in an enclosed fumigation chamber,and the concentration of SO2was set as 5,10,20 and 40 mg·m- 3for various durations. Our results showed that the membrane permeability,the contents of malondialdehyde(MDA),free-proline and soluble sugar were enhanced with the increase of SO2concentration and duration,while the contents of chlorophyll a and b decreased. The injury symptoms in leaves were first observed at 20 mg·m- 3SO2after 5-day exposure. Under the same experimental duration,the activities of superoxide dismutase( SOD),peroxidase( POD),catalase( CAT),and ascorbate peroxidase(APX) were induced greatly at the lower SO2concentrations and then decreased at the higher SO2concentrations. The activities of SOD and APX were induced at 5 mg·m- 3SO2,while those of peroxidase(POD) and catalase(CAT) were induced at 10 mg·m- 3SO2. Under the 40 mg·m- 3SO2stress,the activities of SOD,CAT,POD,and APX were significantly decreased in comparison with those in the control during the whole experimental periods. Our results suggest that Taxus chinensis var. mairei can adapt to 10 mg·m- 3SO2-polluted environments with no obvious phenotypic injury through its own stress protection system to improve resistance to SO2,therefore this species can be planted in SO2polluted areas.
【Fund】: 四川省教育厅项目(13ZB0289);; 四川农业大学双支计划项目资助
【CateGory Index】: X173
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