Genetic diversity analysis of abiotic stress response gene <Emphasis Type="Italic">TaSnRK2.7</Emphasis>-<Emphasis Type="Italic">A</Emphasis> in common wheat |
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Authors: | Hongying Zhang Xinguo Mao Jianan Zhang Xiaoping Chang Chengshe Wang Ruilian Jing |
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Institution: | (1) The National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, 100081, China;(2) College of Agronomy, Northwest A & F University, Yangling, 712100, Shaanxi, China; |
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Abstract: | 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. |
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