Genome-wide association of yield traits in a nested association mapping population of barley reveals new gene diversity for future breeding

Journal of Experimental Botany
Rajiv SharmaAndrew J Flavell

Abstract

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 ~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 germ...Continue Reading

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Citations

Nov 18, 2018·The Plant Journal : for Cell and Molecular Biology·Maricris L ZaidemMichael D Purugganan
Mar 13, 2020·Plant Biotechnology Journal·Wolfram WeckwerthRajeev K Varshney
Sep 3, 2020·Plant Biotechnology Journal·Abhishek BohraRajeev Kumar Varshney
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May 11, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Miriam Fernández-CallejaErnesto Igartua
May 21, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Pallavi SinhaRajeev K Varshney

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