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Quantitative trait loci controlling kernel discoloration in barley (Hordeum vulgare L.)

Li, C.D. and Lance, C.M. and Collins, H.M. and Tarr, A. and Roumeliotis, S. and Harasymow, S. and Cakir, M. and Fox, G.P. and Grime, C.R. and Broughton, S. and Young, K.J. and Raman, H. and Barr, A.R. and Moody, D.B. and Read, B.J. (2003) Quantitative trait loci controlling kernel discoloration in barley (Hordeum vulgare L.). Australian Journal of Agricultural Research, 54 (12). pp. 1251-1259.

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Article Link(s): http://dx.doi.org/10.1071/AR03002

Publisher URL: http://www.publish.csiro.au

Abstract

Barley kernel discoloration (KD) leads to substantial annual loss in value through downgrading and discounting of malting barley. KD is a difficult trait to introgress into elite varieties as it is controlled by multiple genes and strongly influenced by environment and maturity. As the first step towards marker assisted selection for KD tolerance, we mapped quantitative trait loci (QTLs) controlling KD measured by grain brightness [Minolta L; (Min L)], redness (Min a), and yellowness (Min b) in 7 barley populations. One to 3 QTLs were detected for grain brightness in various populations, and one QTL could account for 5–31% of the phenotypic variation.

The QTL located around the centromere region of chromosome 2H was consistently detected in 6 of the 7 populations, explaining up to 28% of the phenotypic variation. In addition, QTLs for grain brightness were most frequently identified on chromosomes 3H and 7H in various populations. Australian varieties Galleon, Chebec, and Sloop contribute an allele to increase grain brightness on chromosome 7H in 3 different populations. A major gene effect was detected for grain redness. One QTL on chromosome 4H explained 54% of the phenotypic variation in the Sloop/Halcyon population, and was associated with the blue aleurone trait. A second QTL was detected on the long arm of chromosome 2H in 3 populations, accounting for 23–47% of the phenotypic variation.

The major QTLs for grain yellowness were mapped on chromosomes 2H and 5H. There were strong associations between the QTLs for heading date, grain brightness, and yellowness. The molecular markers linked with the major QTLs should be useful for marker assisted selection for KD.

Proceedings of the 11th Australian Agronomy Conference, Geelong, 2003.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science
Business groups:Agri-Science, Crop and Food Science
Additional Information:Reproduced with permission from © CSIRO Publishing. Access to published version may be available via Publisher’s website.
Keywords:Weather staining; grain quality; MAS.
Subjects:Plant culture > Field crops > Barley
Science > Biology > Genetics > Quantitative genetics (esp. Quantitative Trait Loci (QTL) articles)
Deposited On:07 May 2004
Last Modified:08 Jun 2015 15:49

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