Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/106165
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Type: Journal article
Title: Quantitative trait loci for yield and grain plumpness relative to maturity in three populations of barley (Hordeum vulgare L.) grown in a low rain-fall environment
Author: Obsa, B.
Eglinton, J.
Coventry, S.
March, T.
Guillaume, M.
Le, T.
Hayden, M.
Langridge, P.
Fleury, D.
Citation: PLoS ONE, 2017; 12(5):e0178111-1-e0178111-17
Publisher: Public Library of Science (PLoS)
Issue Date: 2017
ISSN: 1932-6203
1932-6203
Statement of
Responsibility: 
Bulti Tesso Obsa, Jason Eglinton, Stewart Coventry, Timothy March, Maxime Guillaume, Thanh Phuoc Le, Matthew Hayden, Peter Langridge, Delphine Fleury
Abstract: Identifying yield and grain plumpness QTL that are independent of developmental variation or phenology is of paramount importance for developing widely adapted and stable varieties through the application of marker assisted selection. The current study was designed to dissect the genetic basis of yield performance and grain plumpness in southern Australia using three doubled haploid (DH) populations developed from crosses between adapted parents that are similar in maturity and overall plant development. Three interconnected genetic populations, Commander x Fleet (CF), Commander x WI4304 (CW), and Fleet x WI4304 (FW) developed from crossing of Australian elite barley genotypes, were used to map QTL controlling yield and grain plumpness. QTL for grain plumpness and yield were analysed using genetic linkage maps made of genotyping-by-sequencing markers and major phenology genes, and field trials at three drought prone environments for two growing seasons. Seventeen QTL were detected for grain plumpness. Eighteen yield QTL explaining from 1.2% to 25.0% of the phenotypic variation were found across populations and environments. Significant QTL x environment interaction was observed for all grain plumpness and yield QTL, except QPlum.FW-4H.1 and QYld.FW-2H.1. Unlike previous yield QTL studies in barley, none of the major developmental genes, including Ppd-H1, Vrn-H1, Vrn-H2 and Vrn-H3, that drive barley adaption significantly affected grain plumpness and yield here. Twenty-two QTL controlled yield or grain plumpness independently of known maturity QTL or genes. Adjustment for maturity effects through co-variance analysis had no major effect on these yield QTL indicating that they control yield per se.
Keywords: Hordeum; Plant Proteins; Chromosome Mapping; Rain; Phenotype; Polymorphism, Single Nucleotide; Quantitative Trait Loci; Australia; Droughts; Genetic Linkage; Edible Grain
Rights: © 2017 Obsa et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
RMID: 0030070373
DOI: 10.1371/journal.pone.0178111
Grant ID: http://purl.org/au-research/grants/arc/PFG002002
Appears in Collections:Agriculture, Food and Wine publications

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