GrainGenes Reference Report: TAG-98-219
Reference
TAG-98-219
Title
Candidate gene analysis of quantitative disease resistance in wheat.
Journal
Theoretical and Applied Genetics
Year
1999
Volume
98
Pages
219-225
Author
Faris JD Li WL Liu DJ Chen PD Gill BS
Abstract
Knowledge of the biological significance underlying quantitative trait loci (QTLs) for disease resistance is generally limited. In recent years, advances in plant-microbe interactions and genome mapping have lead to an increased understanding of the genes involved in plant defense and quantitative disease resistance. Here, we report on the application of the candidate-gene approach to the mapping of QTLs for disease resistance in a population of wheat recombinant inbreds. Over 50 loci, representing several classes of defense response (DR) genes, were placed on an existing linkage map and the genome was surveyed for QTLs associated with resistance to several diseases including tan spot, leaf rust, Karnal bunt, and stem rust. Analysis revealed QTLs with large effects in regions of putative resistance (R) genes, as previously reported. Several candidate genes, including oxalate oxidase, peroxidase, superoxide dismutase, chitinase and thaumatin, mapped within previouslv identified resistance QTLs and explained a greater amount of the phenotypic variation. A cluster of closely linked DR genes on the long arm of chromosome 7B, which included genes for catalase, chitinase, thaumatins and an ion channel regulator, had major effects for resistance to leaf rust of adult plants under conditions of natural infestation. The results of this study indicate that many minor resistance QTLs may be from the action of DR genes, and that the candidate-gene approach can be an efficient method of QTL identification.
External Databases
Agricola: 2008-84460 http://link.springer.de/link/service/journals/00122/bibs/9098002/90980219.htm
QTL
QTsc.ndsu-4A
Keyword
aegilops
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.
GrainGenes Reference Report: TAG-98-219
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||