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Canopy humidity and irrigation regimes interactively affect rice physiology, grain filling and yield during grain filling period

Author

Listed:
  • Chen, Le
  • Deng, Xueyun
  • Duan, Hongxia
  • Tan, Xueming
  • Xie, Xiaobing
  • Pan, Xiaohua
  • Guo, Lin
  • Luo, Tao
  • Chen, Xinbiao
  • Gao, Hui
  • Wei, Haiyan
  • Zhang, Hongcheng
  • Zeng, Yongjun

Abstract

Rice growth and yield performance are closely related to climate variables and soil water regimes. Therefore, in this study, normal humidity (NH) and high humidity (HH) treatments of rice canopy were performed and combined with continuous flooding (CF), alternate wetting and drying (AWD), and drought cultivation (DC). The changes in crop physiology were monitored in a 2-year artificial intelligence greenhouse experiment. Creating HH lowered the seed setting rate, grains per panicle and yield relative both under AWD and CF, but was rather beneficial under DC. The HH decreased the soil plant analysis development (SPAD) parameter and net photosynthetic rate while leaf surface temperature, antioxidant enzyme activity and malondialdehyde (MDA) level got increased. Additionally, HH increased the contents of abscisic acid (ABA), gibberellin (GA3) and jasmonic acid (JA) and the activities of key starch synthase, increasing the grain filling rate while shortening the active filling duration. The rice yield of AWD treatment under HH condition was the highest, mainly because the net photosynthetic rate, pollen viability and key starch synthase activity were maintained at a higher level. The AWD measures can be adopted to maintain high rice yields under high humidity conditions, while yields can be improved by increasing canopy humidity under persistent drought conditions.

Suggested Citation

  • Chen, Le & Deng, Xueyun & Duan, Hongxia & Tan, Xueming & Xie, Xiaobing & Pan, Xiaohua & Guo, Lin & Luo, Tao & Chen, Xinbiao & Gao, Hui & Wei, Haiyan & Zhang, Hongcheng & Zeng, Yongjun, 2025. "Canopy humidity and irrigation regimes interactively affect rice physiology, grain filling and yield during grain filling period," Agricultural Water Management, Elsevier, vol. 307(C).
    • Handle: RePEc:eee:agiwat:v:307:y:2025:i:c:s0378377424004797
    DOI: 10.1016/j.agwat.2024.109143
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    as
    1. Chen, Le & Deng, Xueyun & Duan, Hongxia & Tan, Xueming & Xie, Xiaobing & Pan, Xiaohua & Guo, Lin & Gao, Hui & Wei, Haiyan & Zhang, Hongcheng & Luo, Tao & Chen, Xinbiao & Zeng, Yongjun, 2023. "Water management can alleviate the deterioration of rice quality caused by high canopy humidity," Agricultural Water Management, Elsevier, vol. 289(C).
    2. Xu, Guo-wei & Lu, Da-Ke & Wang, He-Zheng & Li, Youjun, 2018. "Morphological and physiological traits of rice roots and their relationships to yield and nitrogen utilization as influenced by irrigation regime and nitrogen rate," Agricultural Water Management, Elsevier, vol. 203(C), pages 385-394.
    3. Md. Ruhul Amin & Junbiao Zhang & Mingmei Yang, 2015. "Effects of Climate Change on the Yield and Cropping Area of Major Food Crops: A Case of Bangladesh," Sustainability, MDPI, vol. 7(1), pages 1-18, January.
    4. Zhang, Peng & Zhang, Junjie & Chen, Minpeng, 2017. "Economic impacts of climate change on agriculture: The importance of additional climatic variables other than temperature and precipitation," Journal of Environmental Economics and Management, Elsevier, vol. 83(C), pages 8-31.
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