文献类型： 外文期刊
第一作者： Li, Yibo
作者： Li, Yibo;Tao, Fulu;Li, Yibo;Tao, Fulu;Tao, Fulu;Hao, Yuanfeng;Tong, Jingyang;Xiao, Yonggui;He, Zhonghu;Reynolds, Matthew
作者机构：
关键词： Heat stress; Intraspecific variation; Photosynthetic traits; Triticum aestivum L; Marker-traits associations; Adaptation
期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.2； 五年影响因子：5.9 ）
ISSN： 1161-0301
年卷期： 2023 年 145 卷
页码：
收录情况： SCI
摘要： Extreme temperature, especially heat stress, is increasingly limiting wheat production, resulting in a large yield loss worldwide. Identifying the cultivars, traits and molecular mechanisms conferring extreme high temperature tolerance is essential for comprehending crop resilience to extreme climates and breeding climate-resilient cultivars. Here, we identified 23 extreme high temperature-tolerant cultivars (11.0%) out of 209 wheat culti-vars based on mass field experiments. In an extreme high temperature year, wheat grain yield was significantly reduced by 27.1% among all the genotypes. We found that radiation use efficiency, plant height, thousand-grain weight, flag leaf width, accumulated thermal time to flowering, net photosynthetic rate and SPAD at flowering and grain filling rate could be the traits associated with extreme high temperature tolerance. These traits were indicative of yield in two years differing in temperature, exhibiting a high heritability. Additionally, 203 loci associated with these traits were identified. The results indicated that the interval 755.97-767.82 Mb on chro-mosome 2 A was linked to flag leaf area, grain yield, accumulated thermal time to flowering and maturity, leaf dry weight at flowering and spike dry weight at flowering, resulting in a cumulative genetic effect on yield. Our findings identify wheat cultivars, traits and associated loci for extreme high temperature tolerance selection, facilitating marker-assisted breeding of cultivars under a changing climate.
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