Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

Lycopene-ε-cyclase (e-LCY3A) is functionally associated with quantitative trait loci for flour b* colour on chromosome 3A in wheat (Triticum aestivum L.)

Crawford, A.C. and Francki, M.G. (2013) Lycopene-ε-cyclase (e-LCY3A) is functionally associated with quantitative trait loci for flour b* colour on chromosome 3A in wheat (Triticum aestivum L.). Molecular Breeding, 31 (3). pp. 737-741.

Link to Published Version: http://dx.doi.org/10.1007/s11032-012-9812-x
*Subscription may be required

Abstract

Flour b* colour is an important grain quality parameter for specific wheat end-products. The genetic control of b* colour in Australian wheat accessions is controlled by quantitative trait loci (QTL) on chromosomes 3A, 3B, 7A and 7B accumulating lutein, a compound of the carotenoid biosynthetic pathway. The relationship between lutein accumulation and flour b* colour provides an opportunity to identify sequence variants of genes encoding enzymes from the biosynthetic pathway that may control trait variation. This study identified a single nucleotide polymorphism (SNP) in the gene encoding lycopene-ε-cylcase on chromosome 3A (e-LYC3A) between two wheat accessions Ajana and WAWHT2074, identifying two alleles, e-LYC3Aa and e-LYC3Ab, respectively. e-LCY3Ab was present in 62. 5 % of the wheat accessions analysed. A highly significant (P < 0. 01) association with QTL on chromosome 3A in two mapping populations indicated that e-LYC3A is functionally associated with b* colour variation in some Australian wheat accessions. The SNP induced a serine/glycine substitution at amino acid residue 123 and a subtle change in protein folding at amino acid residue 119. The e-LYC3A SNP may be considered along with other alleles and genes on homoeologous group 3 and 7 chromosomes for selecting desirable flour b* colour variation in marker-assisted breeding.

Item Type: Journal Article
Murdoch Affiliation: Western Australian State Agricultural Biotechnology Centre
Publisher: Kluwer Academic Publishers
Copyright: © 2012 Springer Science+Business Media Dordrecht
URI: http://researchrepository.murdoch.edu.au/id/eprint/13930
Item Control Page Item Control Page