Photosynthetica, 2007 (vol. 45), issue 4

Photosynthetica 2007, 45(4):582-588 | DOI: 10.1007/s11099-007-0100-7

Photosynthesis and yield responses of ozone-polluted winter wheat to drought

H. Xu1, D. K. Biswas1, W. D. Li1, S. B. Chen1, L. Zhang1, G. M. Jiang1,2,*, Y. G. Li1,*
1 Key Laboratory of Vegetation and Environmental Change, Institute of Botany, The Chinese Academy of Sciences, Beijing, P.R. China
2 School of Crop Sciences, Shandong Agricultural University, Tai'an, P.R. China

Winter wheat (Triticum aestivum L. cv. Jingdong 8) was exposed to short-term high ozone treatment after anthesis and then was either well irrigated with soil water content (SWC) of 80-85 % (O3+W) or drought treated (SWC 35-40 %, O3+D). Short-term ozone exposure significantly decreased irradiance-saturated net photosynthetic rate (P N) of winter wheat. Under good SWC, P N of the O3-treated plant was similar to that of control on 2 d after O3-exposure (6 DAA), but decreased significantly after 13 DAA, indicating that O3 exposure accelerated leaf senescence. Meanwhile, green flag leaf area was reduced faster than that of control. As a result, grain yield of O3+W was significantly decreased. P N of O3+D was further notably decreased and green flag leaf area was reduced more than that in O3+W. Consequently, substantial yield loss of O3+D was observed compared to that of O3+W. Although P N was significantly positively correlated with stomatal conductance, it also had notable positive correlation with the maximum photochemical efficiency in the dark adapted leaves (Fv/Fm), electron transport rate (ETR), photochemical quenching (qP), as well as content of chlorophyll, suggesting that the depression of P N was mainly caused by non-stomatal limitation. Hence optimal soil water condition should be considered in order to reduce the yield loss caused by O3 pollution.

Keywords: air pollution; chlorophyll a fluorescence; gas exchange; intercellular CO2 concentration; stomatal conductance; transpiration rate; Triticum aestivum L; water management

Received: March 16, 2007; Accepted: June 7, 2007; Published: December 1, 2007Show citation

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Xu, H., Biswas, D.K., Li, W.D., Chen, S.B., Zhang, L., Jiang, G.M., & Li, Y.G. (2007). Photosynthesis and yield responses of ozone-polluted winter wheat to drought. Photosynthetica, 45(4), 582-588. doi: 10.1007/s11099-007-0100-7.
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