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<p>Mid-season rice in the Yangtze River basin was studied to analyze the effects of high-temperature stress during flowering on yield and seed setting rate, using ORYZA(v3) model simulation data (1981–2019). Results indicated that: (1) Under varying high-temperature durations during flowering, rice yield and seed setting rate were less negatively impacted in coastal Jiangsu. (2) In the mid-season rice-producing area of the Yangtze basin, long-duration (≥8 days) low-intensity (≤38 ℃) and short-duration (≤3 days) high-intensity (≥41 ℃) heat stress during flowering induced similar yield and seed setting rate reductions. (3) Yield and seed setting rate reduction trends plateaued when high-temperature duration at anthesis reached 8 days; durations below 2 days showed no significant differential effects on reduction percentages across intensities. Given these findings, under future warming scenarios, extremely high-temperature events in the rice-producing region of the Yangtze River Basin are expected to increase in frequency and persistence. Proactive measures are crucial for mitigating sequential high-temperature events during rice flowering, thereby ensuring stable and high yields in mid-season rice-producing areas of the Yangtze Basin.</p>

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High-temperature stress during rice flowering stage: critical roles of cumulative exposure and coastal adaptation

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Manshan Yang,
  • Runze Liu,
  • Tao Li,
  • Zhentao Zhang,
  • Yuanbo Zhao,
  • Haoyu Ma,
  • Yanying Shi,
  • Zhijuan Liu,
  • Fengjing Xiao,
  • Xiaoguang Yang

摘要

Mid-season rice in the Yangtze River basin was studied to analyze the effects of high-temperature stress during flowering on yield and seed setting rate, using ORYZA(v3) model simulation data (1981–2019). Results indicated that: (1) Under varying high-temperature durations during flowering, rice yield and seed setting rate were less negatively impacted in coastal Jiangsu. (2) In the mid-season rice-producing area of the Yangtze basin, long-duration (≥8 days) low-intensity (≤38 ℃) and short-duration (≤3 days) high-intensity (≥41 ℃) heat stress during flowering induced similar yield and seed setting rate reductions. (3) Yield and seed setting rate reduction trends plateaued when high-temperature duration at anthesis reached 8 days; durations below 2 days showed no significant differential effects on reduction percentages across intensities. Given these findings, under future warming scenarios, extremely high-temperature events in the rice-producing region of the Yangtze River Basin are expected to increase in frequency and persistence. Proactive measures are crucial for mitigating sequential high-temperature events during rice flowering, thereby ensuring stable and high yields in mid-season rice-producing areas of the Yangtze Basin.