%A Cheng,Xinran %A Wang,Shengxing %A Xu,Dongmei %A Liu,Xue %A Li,Xinyu %A Xiao,Weiwei %A Cao,Jiajia %A Jiang,Hao %A Min,Xiaoyu %A Wang,Jianfeng %A Zhang,Haiping %A Chang,Cheng %A Lu,Jie %A Ma,Chuanxi %D 2019 %J Frontiers in Genetics %C %F %G English %K Common wheat,Seed Dormancy,GASR,GA,ABA %Q %R 10.3389/fgene.2019.00980 %W %L %M %P %7 %8 2019-October-18 %9 Original Research %+ Haiping Zhang,College of Agronomy, Anhui Agricultural University, Key Laboratory of Wheat Biology and Genetic Improvement on Southern Yellow & Huai River Valley, Ministry of Agriculture and Rural Affairs,China,zhhp20@163.com %+ Chuanxi Ma,College of Agronomy, Anhui Agricultural University, Key Laboratory of Wheat Biology and Genetic Improvement on Southern Yellow & Huai River Valley, Ministry of Agriculture and Rural Affairs,China,zhhp20@163.com %# %! GASR gene family in wheat and characterization of TaGASR34 %* %< %T Identification and Analysis of the GASR Gene Family in Common Wheat (Triticum aestivum L.) and Characterization of TaGASR34, a Gene Associated With Seed Dormancy and Germination %U https://www.frontiersin.org/articles/10.3389/fgene.2019.00980 %V 10 %0 JOURNAL ARTICLE %@ 1664-8021 %X Seed dormancy and germination are important agronomic traits in wheat (Triticum aestivum L.) because they determine pre-harvest sprouting (PHS) resistance and thus affect grain production. These processes are regulated by Gibberellic Acid-Stimulated Regulator (GASR) genes. In this study, we identified 37 GASR genes in common wheat, which were designated TaGASR1-37. Moreover, we identified 40 pairs of paralogous genes, of which only one had a Ka/Ks value greater than 1, indicating that most TaGASR genes have undergone negative selection. Chromosomal location and duplication analysis revealed 25 pairs of segmentally duplicated genes and seven pairs of tandemly duplicated genes, suggesting that large-scale duplication events may have contributed to the expansion of TaGASR gene family. Microarray analysis of the expression of 18 TaGASR genes indicated that these genes play diverse roles in different biological processes. Using wheat varieties with contrasting seed dormancy phenotypes, we investigated the expression patterns of TaGASR genes and the corresponding seed germination index phenotypes in response to water imbibition, exogenous ABA and GA treatment, and low- and high-temperature treatment. Based on these data, we identified the TaGASR34 gene as potentially associated with seed dormancy and germination. Further, we used a SNP mutation of the TaGASR34 promoter (-16) to develop the CAPS marker GS34-7B, which was then used to validate the association of TaGASR34 with seed dormancy and germination by evaluating two natural populations across environments. Notably, the frequency of the high-dormancy GS34-7Bb allele was significantly lower than that of the low-dormancy GS34-7Ba allele, implying that the favorable GS34-7Bb allele has not previously been used in wheat breeding. These results provide valuable information for further functional analysis of TaGASR genes and present a useful gene and marker combination for future improvement of PHS resistance in wheat.