NDLI: Chromosomal location of wheat genes of the carotenoid biosynthetic pathway and evidence for a catalase gene on chromosome 7A functionally associated with flour b* colour variation

Content Provider	Springer Nature Link
Author	Crawford, Allison C. Francki, Michael G.
Copyright Year	2013
Abstract	Knowledge of molecular and genetic mechanisms controlling wheat grain quality characteristics is significant for improving flour for end-product functionality. Flour b* colour is an important quality trait for breeding wheat varieties to produce grain for specific market requirements. The degree of flour yellowness is due to the accumulation of carotenoids in grain, particularly lutein. Flour b* is under polygenic control and quantitative trait loci (QTL) have frequently been reported on chromosome 7AL. Analysis of carotenoid genes showed that phytoene synthase (PSY) co-located to the QTL on 7AL but other genes at this locus are also thought to contribute flour b* colour variation. This study used the wheat genome survey sequence and identified the chromosomal location of all wheat carotenoid genes, but none other than PSY were located on 7AL and, therefore, other genes may control flour b* colour variation including oxidative genes that degrade carotenoids. An investigation of EST bin mapped to 7AL identified a gene encoding a catalase enzyme (Cat3-A1) that was phylogenetically related to other plant class III enzymes, co-located to the QTL for flour b* colour variation on 7AL in three mapping populations and expressed during seed development. Therefore, Cat3-A1 was functionally associated with flour b* colour variation. Catalase acts upon hydrogen peroxide as a substrate and it was postulated that Cat3-A1 alleles control varying degrees of bleaching action on lutein in developing wheat grain. Markers for Cat3-A1 developed in this study can be used in conjunction with other candidate gene markers including phytoene synthase and lycopene-ε-cylase to develop a molecular signature for selecting lines with specific flour b* colour values in wheat breeding.
Starting Page	483
Ending Page	493
Page Count	11
File Format	PDF
ISSN	16174615
Journal	Molecular and General Genetics MGG
Volume Number	288
Issue Number	10
e-ISSN	16174623
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-07-06
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Flour b* Carotenoid Lutein Chromosome 7A Catalase Cell Biology Biochemistry Microbial Genetics and Genomics Plant Genetics & Genomics Animal Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Molecular Biology

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