부산대학교 도서관

This study analyzed allelic variations in major heading date genes and conducted a genome-wide association analysis using a wheat core collection to explore genetic loci related to heading date under the Korean weather conditions. Significant differences in heading date were observed based on the genotype of the Ppd-D1 gene, while no significant difference in heading date was observed accroding to the genotypes of Vrn-1 and Ppd-A1. Furthermore, despite Korean cultivars exhibiting extremely early heading globally, the allelic diversity in Vrn-1 and Ppd-1 was limited. Through GWAS using the entire wheat core collection (n=518), two significant SNPs (AX-95222044 and AX-94685526) were selected as the major loci associated with heading date. Additionally, two SNPs (AX-94550996 and AX-94970315) were chosen from the GWAS using the accessions (n=231) carrying the Vrn-1 and Ppd-1 genotypes that are identical to 40 Korean wheat cultivars. Among these, the genes harboring AX-95222044 and AX-94970315 have been reported in previous studies to be associated with wheat heading dates, and the gene carrying AX-94550996 has been reported to be related to flowering time in the orthologous gene of Arabidopsis. Considering the genotypes of Ppd-D1 and the four selected SNPs from GWAS, the following accessions may prove useful as genetic resources for breeding early heading wheat cultivars - five Korean accessions (IT no. 14303, 15864, 116118, 175533, 237807), one Chinese accession (IT no. 235356), and two Portuguese accessions (IT no. 297843, 297970). Also, utilizing the four selected SNPs from GWAS in this study may help develop molecular markers for breeding early-maturing cultivars under Korean weather conditions.