Genetic diversity analysis of abiotic stress response gene TaSnRK2.7-A in common wheat

文献类型： 外文期刊

第一作者： Zhang, Hongying

作者： Zhang, Hongying;Mao, Xinguo;Zhang, Jianan;Chang, Xiaoping;Jing, Ruilian;Zhang, Hongying;Wang, Chengshe

作者机构：

关键词： haplotype diversity;nucleotide diversity;selection;population bottleneck;crop breeding;abiotic stress response

期刊名称：GENETICA （ 影响因子：1.082； 五年影响因子：1.489 ）

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收录情况： SCI

摘要： Sucrose non-fermenting1-related protein kinase 2 (SnRK2) plays a key role in plant stress signaling transduction pathways. In this study, one copy of TaSnRK2.7, a SnRK2 member of common wheat, was isolated and characterized for nucleotide diversity among 45 wheat accessions with different stress-response features. Most of the accessions were elite wheat cultivars, which had been subject to population bottlenecks and intensive selection during breeding. Nucleotide and haplotype diversity across the entire TaSnRK2.7-A region was 0.00076 and 0.590, respectively, and diversity in non-coding regions was higher than that in coding regions. Sliding-window analysis showed variable levels of nucleotide variation along the entire TaSnRK2.7-A region; the sixth intron and ninth exon represented variation-enriched regions. As predicted, neutrality tests revealed that population bottlenecks or purifying selection had acted on the TaSnRK2.7-A gene, a relatively conserved gene. Furthermore, strong linkage disequilibrium between SNP loci extends across the entire TaSnRK2.7-A region. These findings demonstrate that the TaSnRK2.7-A genomic region has evolved under extensive selection pressure during crop breeding.

分类号： Q3

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