Wheat heat tolerance is impaired by heightened deletions in the distal end of 4AL chromosomal arm
文献类型： 外文期刊
作者： Zhai, Huijie 1 ; Jiang, Congcong 3 ; Zhao, Yue 3 ; Yang, Shuling 1 ; Li, Yiwen 3 ; Yan, Kunfang 1 ; Wu, Shuyu 1 ; Luo, Bi 1 ;
作者机构： 1.Henan Agr Univ, Coll Agron, State Key Lab Wheat & Maize Crop Sci, Zhengzhou, Peoples R China
2.Henan Agr Univ, Ctr Crop Genome Engn, Zhengzhou, Peoples R China
3.Chinese Acad Sci, Inst Genet & Dev Biol, State Key Lab Plant Cell & Chromosome Engn, Beijing, Peoples R China
4.Henan Inst Sci & Technol, Sch Life Sci & Technol, Xinxiang, Henan, Peoples R China
5.Heilongjiang Acad Agr Sci, Crop Breeding Inst, Harbin, Peoples R China
6.Int Maize & Wheat Improvement Ctr, Texcoco, Mexico
7.Hebei Acad Agr & Forestry Sci, Dryland Farming Inst, Hengshui, Hebei, Peoples R China
8.Xinxiang Acad Agr Sci, Xinxiang, Henan, Peoples R China
9.Jiyuan Acad Agricultral Sci, Jiyuan, Henan, Peoples R China
10.Yangzhou Acad Agr Sci, Yangzhou, Jiangsu, Peoples R China
11.Yantai Acad Agr Sci, Yantai, Shandong, Peoples R China
12.Luoyang Acad Agricultral & Forestry Sci, Luoyang, Henan, Peoples R China
关键词： genetic mapping; haplotype analysis; heat stress tolerance; gene deletion; TaHST1; wheat
期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）
ISSN： 1467-7644
年卷期： 2021 年 19 卷 5 期
页码：
收录情况： SCI
摘要： Heat stress (HS) causes substantial damages to worldwide crop production. As a cool season crop, wheat (Triticum aestivum) is sensitive to HS-induced damages. To support the genetic improvement of wheat HS tolerance (HST), we conducted fine mapping of TaHST1, a locus required for maintaining wheat vegetative and reproductive growth under elevated temperatures. TaHST1 was mapped to the distal terminus of 4AL chromosome arm using genetic populations derived from two BC6F6 breeding lines showing tolerance (E6015-4T) or sensitivity (E6015-3S) to HS. The 4AL region carrying TaHST1 locus was approximately 0.949 Mbp and contained the last 19 high confidence genes of 4AL according to wheat reference genome sequence. Resequencing of E6015-3S and E6015-4T and haplotype analysis of 3087 worldwide wheat accessions revealed heightened deletion polymorphisms in the distal 0.949 Mbp region of 4AL, which was confirmed by the finding of frequent gene losses in this region in eight genome-sequenced hexaploid wheat cultivars. The great majority (86.36%) of the 3087 lines displayed different degrees of nucleotide sequence deletions, with only 13.64% of them resembling E6015-4T in this region. These deletions can impair the presence and/or function of TaHST1 and surrounding genes, thus rendering global wheat germplasm vulnerable to HS or other environmental adversities. Therefore, conscientious and urgent efforts are needed in global wheat breeding programmes to optimize the structure and function of 4AL distal terminus by ensuring the presence of TaHST1 and surrounding genes. The new information reported here will help to accelerate the ongoing global efforts in improving wheat HST.
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