期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 69, 期 16, 页码 3811-3822出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ery178
关键词
Genome-wide association scans (GWAS); nested association mapping (NAM); quantitative trait locus hotspot (QTL hotspot); yield-related grain traits
资金
- ERA-CAPS, via the UK Biotechnology and Biological Sciences Research Council (BBSRC) [BB/M004856/1]
- ERA-CAPS, via the UK Biotechnology and Biological Sciences Research Council (German Research Foundation (DEG)) [Pi339/8-1]
- DEG [Pi339/7-1, 1530]
- BBSRC [BB/M004856/1] Funding Source: UKRI
To explore wild barley as a source of useful alleles for yield improvement in breeding, we have carried out a genome wide association scan using the nested association mapping population HEB-25, which contains 25 diverse exotic barley genomes superimposed on an similar to 70% genetic background of cultivated barley. A total of 1420 HEB-25 lines were trialled for nine yield-related grain traits for 2 years in Germany and Scotland, with varying N fertilizer application. The phenotypic data were related to genotype scores for 5398 gene-based single nucleotide polymorphism (SNP) markers. A total of 96 quantitative trait locus (QTL) regions were identified across all measured traits, the majority of which co-localize with known major genes controlling flowering time (Ppd-H2, HvCEN, HvGI, VRN-H1, and VRN-H3) and spike morphology (VRS3, VRS1, VRS4, and INT-C) in barley. Fourteen QTL hotspots, with at least three traits coinciding, were also identified, several of which co-localize with barley orthologues of genes controlling grain dimensions in rice. Most of the allele effects are specific to geographical location and/or exotic parental genotype. This study shows the existence of beneficial alleles for yield-related traits in exotic barley germplasm and provides candidate alleles for future improvement of these traits by the breeder.
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