Effects of doubled CO_(2) and O3 concentration on Soybean were studied in open-top chambers(OTC).Under doubled CO_(2) concentration,grain yield and biomass increased,the SOD activity,vitamin C(Vc)and carotenoid(Car)co...Effects of doubled CO_(2) and O3 concentration on Soybean were studied in open-top chambers(OTC).Under doubled CO_(2) concentration,grain yield and biomass increased,the SOD activity,vitamin C(Vc)and carotenoid(Car)content also increased;Superoxide(O2-.)generating rate decreased,relative conductivity and malondialdehyde(MDA)content significantly declined.But under doubled O3 concentration,the SOD activity,Vc and Car contents declined,resulting in imbalance of activated-oxygen production,enhanced O2-.generating rate and accelerated process of lipid peroxidation and increase in MDA content and ion leakage of leaves.The final result was decreased grain yield and plant biomass.Interactive effects of doubled CO_(2) and O3 concentrations on soybean were mostly counteractive.However,the beneficial effects of concentration-doubled CO_(2) are more than compensate the negative effects imposed by doubled O3,and the latter in its turn partly counteracted the positive effects of the former.展开更多
基金the National Natural Science Foundation of China(Grant No.40271111)the Knowledge Innovation Major Orientation Program(KZCX2-408,SCXMS0302).
文摘Effects of doubled CO_(2) and O3 concentration on Soybean were studied in open-top chambers(OTC).Under doubled CO_(2) concentration,grain yield and biomass increased,the SOD activity,vitamin C(Vc)and carotenoid(Car)content also increased;Superoxide(O2-.)generating rate decreased,relative conductivity and malondialdehyde(MDA)content significantly declined.But under doubled O3 concentration,the SOD activity,Vc and Car contents declined,resulting in imbalance of activated-oxygen production,enhanced O2-.generating rate and accelerated process of lipid peroxidation and increase in MDA content and ion leakage of leaves.The final result was decreased grain yield and plant biomass.Interactive effects of doubled CO_(2) and O3 concentrations on soybean were mostly counteractive.However,the beneficial effects of concentration-doubled CO_(2) are more than compensate the negative effects imposed by doubled O3,and the latter in its turn partly counteracted the positive effects of the former.
