Influence of elevated CO2 and O3 on IAA, IAA oxidase and peroxidase in the leaves of ginkgo trees |
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| Authors: | X-M Li X-Y He L-H Zhang W Chen and Q Chen |
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| Institution: | (1) Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, P.R. China;(2) College of Chemical and Life Science, Shenyang Normal University, Shenyang, 110034, P.R. China;(3) College of Resources and Environmental Science, Liaoning University, Shenyang, 110036, P.R. China |
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| Abstract: | This study examined the impacts of elevated CO2 or O3 on indole-3-acetic acid (IAA) content, activities of IAA oxidase (IAAO) and peroxidase (POD) in Ginkgo biloba leaves. Plants grown in open-top chambers were exposed to ambient atmosphere (control; C), elevated CO2 and elevated O3 from 1 June to 30 September. An increase in IAA content and decrease in IAAO and POD activities were observed in plants exposed
to elevated CO2 compared with C. Elevated O3 had no significant effect on IAA content and IAAO activity, but increased POD activity during the early days. When trees
pre-exposed to elevated CO2 were transferred to elevated O3 or C, the increase in IAAO activity resulted in the decrease in IAA content. When trees pre-exposed to elevated O3 were transferred to elevated CO2 or C, IAA content, IAAO and POD activities showed no significant changes. The influence of POD activity on the IAA activity
was low. |
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| Keywords: | Additional" target="_blank">Additional Ginkgo biloba carbon dioxide open-top chamber ozone |
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