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Allelic variation of TaABI5-A4 significantly affects seed dormancy in bread wheat

文献类型： 外文期刊

作者： Han, Yang 1 ; Wang, Zeng 1 ; Han, Bing 1 ; Zhang, Yingjun 2 ; Liu, Jindong 3 ; Yang, Yan 1 ;

作者机构： 1.Inner Mongolia Agr Univ, Key Lab Germplasm Innovat & Utilizat Triticeae Cro, Coll Life Sci, 306 Zhaowuda Rd, Hohhot 010018, Inner Mongolia, Peoples R China

2.Hebei Acad Agr & Forestry Sci, Inst Cereal & Oil Crops, Hebei Prov Lab Crop Genet & Breeding, Shijiazhuang 050031, Hebei, Peoples R China

3.Chinese Acad Agr Sci CAAS, Inst Crop Sci, Natl Wheat Improvement Ctr, 12 Zhongguancun South St, Beijing 100081, Peoples R China

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：4.2； 五年影响因子：4.9 ）

ISSN： 0040-5752

年卷期： 2024 年 137 卷 10 期

页码：

收录情况： SCI

摘要： Key message We identified a pivotal transcription factor TaABI5-A4 that is significantly associated with pre-harvest sprouting in wheat; its function in regulating seed dormancy was confirmed in transgenic rice. ABI5 is a critical transcription factor in regulation of crop seed maturation, dormancy, germination, and post-germination. Sixteen copies of homologous sequences of ABI5 were identified in Chinese wheat line Zhou 8425B. Cultivars of two haplotypes TaABI5-A4a and TaABI5-A4b showed significantly different seed dormancies. Based on two SNPs between the sequences of TaABI5-A4a and TaABI5-A4b, two complementary dominant sequence-tagged site (STS) markers were developed and validated in a natural population of 103 Chinese wheat cultivars and advanced lines and 200 recombinant inbred lines (RILs) derived from the Yangxiaomai/Zhongyou 9507 cross; the STS markers can be used efficiently and reliably to evaluate the dormancy of wheat seeds. The transcription level of TaABI5-A4b was significantly increased in TaABI5-A4a-GFP transgenic rice lines compared with that in TaABI5-A4b-GFP. The average seed germination index of TaABI5-A4a-GFP transgenic rice lines was significantly lower than those of TaABI5-A4b-GFP. In addition, seeds of TaABI5-A4a-GFP transgenic lines had higher ABA sensitivity and endogenous ABA content, lower endogenous GA content and plant height, and thicker stem internodes than those of TaABI5-A4b-GFP. Allelic variation of TaABI5-A4-affected wheat seed dormancy and the gene function was confirmed in transgenic rice. The transgenic rice lines of TaABI5-A4a and TaABI5-A4b had significantly different sensitivities to ABA and contents of endogenous ABA and GA in mature seeds, thereby influencing the seed dormancy, plant height, and stem internode length and diameter.

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