Activity of two enzymes of thiol-disulfide cell metabolism, lipoxygenase (LOX, EC 18.104.22.168) and disulfide-reductase (TPDO, EC 22.214.171.124) was studied in recombinant inbred lines of bread wheat ITMI. Their activity in the caryopsis may be connected with the gluten quality, one of the most important traits significant for breeding. The activity of lipoxygenase under favorable and droughty environmental conditions was shown to be associated with the quantitative trait locus (QTL) located on chromosome 4BS near the structural gene of a subunit of this enzyme. However, no QTL common to this enzyme and any characteristic of gluten quality have been found. Four loci responsible for the activity of disulfide reductase were identified on chromosomes 4A, 5D, 6A, and 7D. Previously, indicators of grain and flour properties, such as elasticity, flour strenght, and grain hardiness were mapped at the same loci. This indicates that the given enzyme participates in the formation of the protein complex upon maturation of wheat grain. The detected QTL can be involved in further genetic studies designed to establish the regularities of gluten formation.
Russian Journal of Genetics – Springer Journals
Published: May 23, 2008
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