首页» 新闻动态» 最新论文

Genetic dissection of drought and heat-responsive agronomic traits in wheat

  作 者:Long Li, Xinguo Mao, Jingyi Wang, Xiaoping Chang, Matthew Reynolds, Ruilian Jing


  刊物名称:Plant, Cell & Environment

  出版年份:06 May 2019

  doi: 10.1111/pce.13577

  文章摘要:High yield and wide adaptation are principal targets of wheat breeding, but are hindered by limited knowledge on genetic basis of agronomic traits and abiotic stress tolerances. In this study, 277 wheat accessions were phenotyped across 30 environments with non-stress, drought-stressed, heat-stressed and drought-heat-stressed treatments, and were subjected to genome-wide association study using 395,681 SNPs. We detected 295 associated loci including consistent loci for agronomic traits across different treatments and eurytopic loci for multiple abiotic stress tolerances. A total of 22 loci overlapped with QTL identified by biparental QTL mapping. Six loci were simultaneously associated with agronomic traits and abiotic stress tolerance, four of which fell within selective sweep regions. Selection in Chinese wheat has increased the frequency of superior marker alleles controlling yield-related traits in the four loci during past decades, which conversely diminished favorable genetic variation controlling abiotic stress tolerance in the same loci; two promising candidate paralogous genes colocalized with such loci, thereby providing potential targets for studying the molecular mechanism of stress tolerance-productivity trade-off. These results uncovering promising alleles controlling agronomic traits and/or multiple abiotic stress tolerances, providing insights into heritable covariation between yield and abiotic stress tolerance, will accelerate future efforts for wheat improvement.


TOP 广西体彩网-首页 宁武县 | 义马市 | 镇宁 | 芜湖市 | 蓬莱市 | 绥宁县 | 桐柏县 | 汪清县 | 通江县 | 罗城 | 五寨县 | 丰城市 | 南宁市 | 新巴尔虎右旗 | 巧家县 | 云阳县 | 永平县 | 丽水市 | 大姚县 | 罗源县 | 镇赉县 | 开封市 |