Abstract
Pre-harvest sprouting (PHS) is a major abiotic factor affecting grain weight and quality, and is caused by an early break in seed dormancy. Association mapping (AM) is used to detect correlations between phenotypes and genotypes based on linkage disequilibrium (LD) in wheat breeding programs. We evaluated seed dormancy in 80 Chinese wheat founder parents in five environments and performed a genome-wide association study using 6,057 markers, including 93 simple sequence repeat (SSR), 1,472 diversity array technology (DArT), and 4,492 single nucleotide polymorphism (SNP) markers. The general linear model (GLM) and the mixed linear model (MLM) were used in this study, and two significant markers (tPt-7980 and wPt-6457) were identified. Both markers were located on Chromosome 1B, with wPt-6457 having been identified in a previously reported chromosomal position. The significantly associated loci contain essential information for cloning genes related to resistance to PHS and can be used in wheat breeding programs.
Highlights
In Chinese wheat breeding programs, the crossing parents, known as “founder parents,” are wheat varieties or germplasm lines with excellent properties, such as resistance to numerous biotic and abiotic stresses, high combining ability, and strong heritability of superior agronomic traits, that are used for the development of improved cultivars with wide application value (Zhuang, 2003; Chen et al, 2013)
The identified significantly associated loci might contain essential information for cloning genes related to Pre-harvest sprouting (PHS) resistance and be useful in wheat breeding programs
Significant correlations were observed between all Percent germination (PG) values, except for those of 12WJ and 13YA
Summary
In Chinese wheat breeding programs, the crossing parents, known as “founder parents,” are wheat varieties or germplasm lines with excellent properties, such as resistance to numerous biotic and abiotic stresses, high combining ability, and strong heritability of superior agronomic traits, that are used for the development of improved cultivars with wide application value (Zhuang, 2003; Chen et al, 2013). Over the past seven decades, more than 2,000 wheat (Triticum aestivum L.) cultivars have been released through pedigree selection programs in China. Can be traced back to only 16 ancestral founder parents (Zhuang, 2003; Li et al, 2012). Founder parents have been used in multiple studies on genetic diversity (Wang et al, 2007; Li et al, 2008; 2012), quantitative trait loci (QTL) mapping (Lin et al, 2006; Su et al, 2006; Ma et al, 2007) and association studies (Breseghello and Sorrells, 2006a; Crossa et al, 2007; Xiao et al, 2011). PHS in wheat (Triticum aestivum L.) is the result of the early break in seed dormancy under hu-
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