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Critical Leaf Water Content for Maize Photosynthesis under Drought Stress and Its Response to Rewatering

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  • Xingyang Song

    (College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China
    Gucheng Agro-Meteorological Field Scientific Experiment Base, Chinese Academy of Meteorological Sciences, Beijing 100081, China)

  • Guangsheng Zhou

    (Gucheng Agro-Meteorological Field Scientific Experiment Base, Chinese Academy of Meteorological Sciences, Beijing 100081, China
    Collaborative Innovation Center on Forecast Meteorological Disaster Warning and Assessment, Nanjing University of Information Science & Technology, Nanjing 210044, China
    Joint Eco-Meteorological Laboratory of Chinese Academy of Meteorological Sciences and Zhengzhou University, Zhengzhou 450001, China)

  • Qijin He

    (College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China)

Abstract

Crop photosynthesis is closely related to leaf water content (LWC), and clarifying the LWC conditions at critical points in crop photosynthesis has great theoretical and practical value for accurately monitoring drought and providing early drought warnings. This experiment was conducted to study the response of LWC to drought and rewatering and to determine the LWC at which maize photosynthesis reaches a maximum and minimum and thus changes from a state of stomatal limitation (SL) to non-stomatal limitation (NSL). The effects of rehydration were different after different levels of drought stress intensity at different growth stages, and the maize LWC recovered after rewatering following different drought stresses at the jointing stage; however, the maize LWC recovered more slowly after rewatering following 43 days and 36 days of drought stress at the tasselling and silking stages, respectively. The LWC when maize photosynthesis changed from SL to NSL was 75.4% ± 0.38%, implying that the maize became rehydrated under physiologically impaired conditions. The LWCs at which the maize V cmax25 reached maximum values and zero differed between the drought and rewatering periods. After exposure to drought stress, the maize exhibited enhanced drought stress tolerance, an obviously reduced suitable water range, and significantly weakened photosynthetic capacity. These results provide profound insight into the turning points in maize photosynthesis and their responses to drought and rewatering. They may also help to improve crop water management, which will be useful in coping with the increased frequency of drought and extreme weather events expected under global climate change.

Suggested Citation

  • Xingyang Song & Guangsheng Zhou & Qijin He, 2021. "Critical Leaf Water Content for Maize Photosynthesis under Drought Stress and Its Response to Rewatering," Sustainability, MDPI, vol. 13(13), pages 1-14, June.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:13:p:7218-:d:583693
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    References listed on IDEAS

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    4. Jin, Y.H. & Zhou, D.W. & Jiang, S.C., 2010. "Comparison of soil water content and corn yield in furrow and conventional ridge sown systems in a semiarid region of China," Agricultural Water Management, Elsevier, vol. 97(2), pages 326-332, February.
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    Cited by:

    1. Orawan Kumdee & Md. Samim Hossain Molla & Kulwadee Kanavittaya & Jutamas Romkaew & Ed Sarobol & Sutkhet Nakasathien, 2023. "Morpho-Physiological and Biochemical Responses of Maize Hybrids under Recurrent Water Stress at Early Vegetative Stage," Agriculture, MDPI, vol. 13(9), pages 1-30, September.
    2. Yaqian Zong & Chao Xu & Kai Zhou & Xinhui Duan & Bo Han & Chenggang He & Hua Jiang, . "Effects of exogenous ascorbic acid on photosynthesis and xanthophyll cycle in alfalfa (Medicago sativa L.) under drought and heat stress," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 0.
    3. Zhao, Yunmeng & Na, Mula & Guo, Ying & Liu, Xingping & Tong, Zhijun & Zhang, Jiquan & Zhao, Chunli, 2023. "Dynamic vulnerability assessment of maize under low temperature and drought concurrent stress in Songliao Plain," Agricultural Water Management, Elsevier, vol. 286(C).
    4. Yaqian Zong & Chao Xu & Kai Zhou & Xinhui Duan & Bo Han & Chenggang He & Hua Jiang, 2023. "Effects of exogenous ascorbic acid on photosynthesis and xanthophyll cycle in alfalfa (Medicago sativa L.) under drought and heat stress," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 69(11), pages 487-499.

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