文献类型： 外文期刊

作者： Sun, Ting ¹ ; Miao, Tianhui ² ; Hu, Jianan ¹ ; Zhou, Haoyang ¹ ; Li, Minglu ¹ ; Zhang, Jiayi ¹ ; Pan, Yuanyuan ¹ ; Bi, Ran ¹ ; Ye, Shenghao ¹ ; Wei, Menglei ¹ ; Wu, Zeyu ¹ ; Li, Guoqiang ⁴ ; Yang, Wuguang ⁵ ; Fang, Pingping ⁶ ; Cao, Jing ¹ ; Zhang, Wenyu ¹ ;

作者机构： 1.Jiangsu Acad Agr Sci, Wuxi Branch, Wuxi 214174, Jiangsu, Peoples R China

2.Shengzhou Seed Prod Farm, Shaoxing 312000, Zhejiang, Peoples R China

3.Fujian Agr & Forestry Univ, Coll Agr, Fuzhou, Fujian, Peoples R China

4.Henan Acad Agr Sci, Inst Agr Informat Technol, Key Lab Huang Huai Hai Smart Agr Technol, Minist Agr & Rural Affairs, Zhengzhou 450002, Henan, Peoples R China

5.Crop Technol Promot Ctr Hanjiang Dist, Yangzhou 225009, Jiangsu, Peoples R China

6.Quzhou Acad Agr & Forestry Sci, Quzhou Key Lab Germplasm Innovat & Utilizat Crop, Quzhou 324000, Zhejiang, Peoples R China

7.Jiangsu Univ, Sch Agr Engn, Zhenjiang 212013, Jiangsu, Peoples R China

关键词： Heat stress; Sterility; Temperature threshold; Heading distribution

期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.5； 五年影响因子：5.9 ）

ISSN： 1161-0301

年卷期： 2025 年 170 卷

页码：

收录情况： SCI

摘要： Heat-induced spikelet sterility has become an increasing concern for rice productivity under global warming, especially for new varieties introduced to high-temperature regions. During the hot summer of 2022 and 2023, we conducted field surveys of 62 new rice varieties being promoted in the middle and lower Yangtze River regions of China. Our study recorded the seed-setting rate (SR) at maturity as well as the initial heading date (10 %) and full heading date (80 %) for all varieties. Higher day temperatures extended the heading duration, while higher night temperatures shortened it, leading to significant inter-annual variation in heading duration. Elevated day temperatures significantly reduced SR, while moderately higher night temperatures had a positive effect. The current temperature response function for SR (TRFSR) does not perform well across a wide range of rice varieties due to ecotype-specific temperature thresholds. To address this, we developed a model that integrates heading distribution with a daily-step Horie-type TRFSR, utilizing variety-specific normal distribution parameters and the semi-lethal temperature (T50). The improved coupling model accurately estimated SR across varieties, with a root mean square error (RMSE) of 6.32 % and anR2 of 0.81. The T50 ranged from 34.89 degrees C to 43.24 degrees C, with a significant difference observed between non-hybrid japonica and both hybrid indica and hybrid japonica-indica rice. Our study provided an open-access pipeline for quantitatively evaluating rice heat tolerance across a large number of germplasms, supporting crop modeling and breeding programs.