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

  • Original Papers
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Photosynthetica

Abstract

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.

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Abbreviations

C i :

intercellular CO2 concentration

Chl:

chlorophyll

DAA:

days after anthesis

E:

transpiration rate

ETR:

electron transport rate

Fv/Fm :

photochemical capacity of photosystem 2 in the dark adapted state

g s :

stomatal conductance

HI:

harvest index

P N :

net photosynthetic rate per unit leaf area at saturation irradiance

PAR:

photosynthetically active radiation

PS2:

photosystem 2

qP :

photochemical quenching

SWC:

soil water content

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Authors and Affiliations

  1. Key Laboratory of Vegetation and Environmental Change, Institute of Botany, The Chinese Academy of Sciences, 20 Nanxincun, 100093, Beijing, P.R. China

    H. Xu, D. K. Biswas, W.-D. Li, S.-B. Chen, L. Zhang, G.-M. Jiang & Y.-G. Li

  2. School of Crop Sciences, Shandong Agricultural University, No. 61, Daizong Avenue, 271018, Tai’an, P.R. China

    G.-M. Jiang

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  1. H. Xu
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  2. D. K. Biswas
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  3. W.-D. Li
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  4. S.-B. Chen
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  5. L. Zhang
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  6. G.-M. Jiang
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  7. Y.-G. Li
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Correspondence to G.-M. Jiang or Y.-G. Li.

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Xu, H., Biswas, D.K., Li, WD. et al. Photosynthesis and yield responses of ozone-polluted winter wheat to drought. Photosynthetica 45, 582–588 (2007). https://doi.org/10.1007/s11099-007-0100-7

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  • DOI: https://doi.org/10.1007/s11099-007-0100-7

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