To investigate the effect of elevated 03 on the accumulation of main secondary metabolites in leaves of Ginkgo biloba L., four-year- old trees were exposed in open-top chambers with ambient air and the air with twice ...To investigate the effect of elevated 03 on the accumulation of main secondary metabolites in leaves of Ginkgo biloba L., four-year- old trees were exposed in open-top chambers with ambient air and the air with twice ambient 03 concentration in Shenyang in 2006. Elevated 03 increased the concentrations of terpenes, but decreased the concentrations of phenolics in G. biloba leaves. The results showed that secondary compounds from G. biloba leaves responded to the elevated 03 exposure in a different way when compared to previous studies which showed elevated 03 increased the concentrations of phenolics but had no effect on the terpenes in leaves of other deciduous trees. Furthermore, reduced synthesis of phenolics may decrease the resistance of G. biloba to 03 and other environmental factors. On the other hand, the induced synthesis of terpenes may enhance the antioxidant abilities in G. biloba leaves at the end of 03 fumigation.展开更多
The effects of arbuscular mycorrhizal fungi（AMF） Glomus mosseae on the responses to elevated O3 in growth and nutrition of snap bean（Phaseolus vulgaris L.cv Guangzhouyuan） were investigated.Exposure was conducted ...The effects of arbuscular mycorrhizal fungi（AMF） Glomus mosseae on the responses to elevated O3 in growth and nutrition of snap bean（Phaseolus vulgaris L.cv Guangzhouyuan） were investigated.Exposure was conducted in growth chambers by using three O3 concentrations（20（CF）,80（CFO1） and 120 nL/L（CFO2）;8 hr/day for 75 days）.Results showed that elevated O3 slightly impacted overall mycorrhizal colonization,but significantly decreased the proportional frequency of hypha and increased the proportional frequency of spores and vesicles,suggesting that O3 had significant effects on mycorrhizal structure.Elevated O3 significantly decreased yield,dry mass and nutrient contents（N,P,K,Ca and Mg） in both non-mycorrhizal and mycorrhizal plants.However,significant interactive effects were found in most variables due to that the reduction by O3 in the mycorrhizal plants was less than that in the non-mycorrhizal plants.Additionally,AMF increased the concentrations of N,P,Ca,and Mg in shoot and root.It can be concluded that AMF alleviated detrimental effects of increasing O3 on host plant through improving plant nutrition and growth.展开更多
基金supported by the National Natural Science Foundation of China (No. 90411019)the Foundation of Knowledge Innovation Program of the Chi-nese Academy of Sciences (No. kzcx3-sw-43).
文摘To investigate the effect of elevated 03 on the accumulation of main secondary metabolites in leaves of Ginkgo biloba L., four-year- old trees were exposed in open-top chambers with ambient air and the air with twice ambient 03 concentration in Shenyang in 2006. Elevated 03 increased the concentrations of terpenes, but decreased the concentrations of phenolics in G. biloba leaves. The results showed that secondary compounds from G. biloba leaves responded to the elevated 03 exposure in a different way when compared to previous studies which showed elevated 03 increased the concentrations of phenolics but had no effect on the terpenes in leaves of other deciduous trees. Furthermore, reduced synthesis of phenolics may decrease the resistance of G. biloba to 03 and other environmental factors. On the other hand, the induced synthesis of terpenes may enhance the antioxidant abilities in G. biloba leaves at the end of 03 fumigation.
基金supported by the National Natural Science Foundation of China(No.40701180,30670387)the Chinese Universities Scientific Fund(No.ZZ1106, ZD0904)the Project of Beijing Key Discipline and State Key Laboratory of Urban and Regional Ecology
文摘The effects of arbuscular mycorrhizal fungi（AMF） Glomus mosseae on the responses to elevated O3 in growth and nutrition of snap bean（Phaseolus vulgaris L.cv Guangzhouyuan） were investigated.Exposure was conducted in growth chambers by using three O3 concentrations（20（CF）,80（CFO1） and 120 nL/L（CFO2）;8 hr/day for 75 days）.Results showed that elevated O3 slightly impacted overall mycorrhizal colonization,but significantly decreased the proportional frequency of hypha and increased the proportional frequency of spores and vesicles,suggesting that O3 had significant effects on mycorrhizal structure.Elevated O3 significantly decreased yield,dry mass and nutrient contents（N,P,K,Ca and Mg） in both non-mycorrhizal and mycorrhizal plants.However,significant interactive effects were found in most variables due to that the reduction by O3 in the mycorrhizal plants was less than that in the non-mycorrhizal plants.Additionally,AMF increased the concentrations of N,P,Ca,and Mg in shoot and root.It can be concluded that AMF alleviated detrimental effects of increasing O3 on host plant through improving plant nutrition and growth.
