Elevated ozone negatively affects photosynthesis of current-year leaves but not previous-year leaves in evergreen Cyclobalanopsis glauca seedlings.
Elevated ozone negatively affects photosynthesis of current-year leaves but not previous-year leaves in evergreen Cyclobalanopsis glauca seedlings.
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DOI：
10.1016/j.envpol.2013.04.036
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发表时间：
2014
影响因子：
8.9
通讯作者：
Weiwei Zhang;Zhaozhong Feng;Xiaoke Wang;J. Niu
中科院分区：
文献类型：
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作者：
Weiwei Zhang;Zhaozhong Feng;Xiaoke Wang;J. Niu
为了评估叶龄/叶层对光合作用对慢性臭氧 (O3) 响应的影响，将青冈幼苗（亚热带地区的一种主要常绿阔叶树种）暴露在环境空气 (AA) 或高浓度 O3（AA + 60 ppb O3，E-O3）中两个生长季节的开放顶室中。在 O3 暴露的第二年中，对叶绿素含量、气体交换和叶绿素荧光进行了 3 次研究。结果表明，E-O3降低了当年叶片的光合参数，特别是光饱和光合速率、气孔导度和PSII光化学有效量子产率，但对去年叶片没有影响。在环境条件下生长的植物的气孔导度部分地导致了叶层之间对 E-O3 的不同反应。光辐射或其他与光合作用密切相关的生理生化过程可能发挥重要作用。所有人都建议在评估常绿木本物种的 O3 风险时应考虑叶龄或层数。
To assess the effects of leaf age/layer on the response of photosynthesis to chronic ozone (O3),Cyclobalanopsis glaucaseedlings, a dominant evergreen broadleaf tree species in sub-tropical regions, were exposed to either ambient air (AA) or elevated O3(AA + 60 ppb O3, E-O3) for two growing seasons in open-top chambers. Chlorophyll content, gas exchange and chlorophyllafluorescence were investigated three times throughout the 2nd year of O3exposure. Results indicated that E-O3decreased photosynthetic parameters, particularly light-saturated photosynthesis rate, stomatal conductance and effective quantum yield of PSII photochemistry of current-year leaves but not previous-year leaves. Stomatal conductance of plants grown under ambient conditions partially contributed to the different response to E-O3between leaf layers. Light radiation or other physiological and biochemical processes closely related to photosynthesis might play important roles. All suggested that leaf ages or layers should be considered when assessing O3risk on evergreen woody species.