Photosynthetica, 2011 (vol. 49), issue 1

Photosynthetica 2011, 49(1):29-36 | DOI: 10.1007/s11099-011-0003-5

Effects of ozone exposure on growth and photosynthesis of the seedlings of Liriodendron chinense (Hemsl.) Sarg, a native tree species of subtropical China

W. W. Zhang1, J. F. Niu1, X. K. Wang1,*, Y. Tian2, F. F. Yao3, Z. Z. Feng1,*
1 State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
2 School of Chemical and Environmental Engineering, Beijing Technology and Business University, Beijing, China
3 School of Resources and Environment Science, East China Normal University, Shanghai, China

Little is known about the response of trees to elevated ozone (O3) in the subtropical region of China, where ambient O3 concentrations are high enough to damage plants. In this study, pigment content, gas exchange and chlorophyll (Chl) a fluorescence in leaves of Liriodendron chinense (Hemsl.) Sarg seedlings, a deciduous broadleaf tree species native in subtropical regions, were investigated at 15, 40, and 58 days after O3 fumigation (DAF) at a concentration of 150 mm3 m-3 (E-O3). At the end of experiment, seedlings were harvested for biomass measurement. E-O3 caused visible injuries on the mature leaves e.g. necrotic patches and accelerated early defoliation. Relative to the charcoal-filtered air (CF) treatment, E-O3 significantly decreased shoot and root biomass, pigment content, light-saturated net photosynthesis (P Nsat), stomatal conductance (g s), maximum rate of carboxylation (Vcmax), photochemical quenching coefficient (qp) and effective quantum yield of PSII photochemistry (ΦPSII), and also caused a slight reduction in relative increase of basal diameter. Therefore, L. chinense can be assumed to be an O3-sensitive tree species, which will be threatened by increasing ambient O3 concentrations in China.

Keywords: gas exchange; growth; Liriodendron chinense; ozone

Received: April 22, 2010; Accepted: December 22, 2010; Published: March 1, 2011Show citation

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Zhang, W.W., Niu, J.F., Wang, X.K., Tian, Y., Yao, F.F., & Feng, Z.Z. (2011). Effects of ozone exposure on growth and photosynthesis of the seedlings of Liriodendron chinense (Hemsl.) Sarg, a native tree species of subtropical China. Photosynthetica, 49(1), 29-36. doi: 10.1007/s11099-011-0003-5.
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