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Population structure in a wheat core collection and genomic loci associated with yield under contrasting environments

Lookup NU author(s): Dr Dejan Dodig, Professor Stephen Quarrie, Professor Jerry Barnes

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Abstract

A set of 96 winter wheat accessions sampled from a variety of geographic origins, including cultivars and breeding lines, were characterized with 46 genomewide SSR loci for genetic diversity and population structure. The genetic diversity within these accessions was examined using a genetic distance-based and a model-based clustering method. The model-based analysis identified an underlying population structure comprising of four distinct sub-populations which corresponded well with distance-based groupings. Information on the population structure is taken into account in an association mapping study of grain yield from a 3-year field trial incorporating fully irrigated, rainfed and drought stress treatments. A total of 21 marker-grain yield associations were identifiedwith nine SSR markers. Most associations were detected only in one to three environments with an average R2 value of 13%. However , marker gwm484 (on chromosome 2D) was associated with yield in six environments, including irrigated, rainfed and drought stress treatments, suggesting it could be used to improve grain yield across a range of environments. Variation in grain yild at this locus was associatd with earlines, early vigour, kernels per spikelet, and harvest index. Mixrosatellite locus psp3200 (on chromosome 6D) was associatedwith yield in dry and hot environments, which was related to earliness, early vigour productive tillering ad total biomass per plant. Partial least squares regression with nine environmental factors showed that precipitation from tillering to maturity was the main environmental factor causing marker x enviroment associations for grain yield.


Publication metadata

Author(s): Zoric M, Dodig D, Kobiljski B, Quarrie S, Barnes J

Publication type: Article

Publication status: Published

Journal: Genetica

Year: 2012

Volume: 140

Issue: 4-6

Pages: 259-275

Print publication date: 01/06/2012

ISSN (print): 0016-6707

ISSN (electronic): 1573-6857

Publisher: Springer Netherlands

URL: http://dx.doi.org/10.1007/s10709-012-9677-2

DOI: 10.1007/s10709-012-9677-2


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