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LI Ying-chun1, LI Ying1,2,CHEN Shuang-lin1**, ZHUANG Ming-hao1, GUO Zi-wu1, YANG Qing-ping1
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Abstract: In this study, open-top chambers (OTCs) were employed to approach the impacts of elevated atmospheric ozone (O3) concentration on the photosynthesis of Phyllostachys edulis. Five treatments were installed, i.e., CF (background atmosphere after filtrated by activated carbon, 22-25 nL·L-1), NF (directly introduce the background atmosphere to the gas chamber, 40-45 nL·L-1), T1 (92-106 nL·L-1 of O3, averagely 100 nL·L-1), T2 (142-160 nL·L-1 of O3, averagely 150 nL·L-1). Under different O3 concentrations, the diurnal variations of P. edulis leaf Pn and Tr represented onepeak curves. With the increasing concentration of O3, the diurnal variations of the leaf Gs, Ci, and Ls trended to be simplified, while that of WUE became stable gradually. Under higher concentrations (≥ 100 nL·L-1) O3, the diurnal means of Pn, Ls, and WUE and the contents Chl, Chl-a, Chl-b, and Car decreased significantly, those of Gs and Tr had a significant increase, while the diurnal mean of Ci and the composition of photosynthetic pigment changed less. In treatments T1 and T2, the Pn,Tr, and Gs were significantly correlated with the environmental factors VpdL, Tair, Ca, and RH, and the Pn and Tr were significantly correlated with the PPED while the Gs was less correlated with the PPED. All the results indicated that 100 and 150 nL·L-1 of O3 could induce the leaf stomatal or nonstomatal limitation of P. edulis, respectively, and the stoma became insensitive to the environment, which impacted the leaf’s normal feedback mechanisms, increased leaf evapotranspiration, and inhibited the degradation or synthesis of photosynthetic pigments, exerting serious negative effects on the photosynthesis and dry matter accumulation of P. edulis.
LI Ying-chun1, LI Ying1,2,CHEN Shuang-lin1**, ZHUANG Ming-hao1, GUO Zi-wu1, YANG Qing-ping1. Impacts of elevated atmospheric ozone concentration on the photosynthetic physiology of Phyllostachys edulis.[J]. cje.
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URL: http://www.cje.net.cn/EN/abstract/abstract17312.shtml
http://www.cje.net.cn/EN/Y2013/V32/I2/344