GrainGenes Reference Report: TAG-108-1426
Reference
TAG-108-1426
Title
A genetic analysis of adult plant resistance to stripe rust in the wheat cultivar Kariega
Journal
Theoretical and Applied Genetics
Year
2004
Volume
108
Pages
1426-1433
Author
[ Hide all but 1 of 7 ] Ramburan VP Pretorius ZA Louw JH Boyd LA Smith PH Boshoff WHP Prins R
Abstract
Summary: The wheat cultivar Kariega expresses complete adult plant resistance to stripe rust in South Africa. The aim of this investigation was to determine the extent and nature of variability in stripe rust resistance in a population of 150 doubled haploid lines generated from a cross between Kariega and the susceptible cultivar Avocet S. Analysis of field data for adult plant stripe rust resistance identified two major QTLs and two minor QTLs in the resistant cultivar Kariega. The two major QTLs were located on chromosomes 7D (QYr.sgi-7D) and 2B (QYr.sgi-2B.1), contributing 29% and 30% to the phenotypic variance, respectively. QYr.sgi-2B.1 is primarily associated with a chlorotic and/or necrotic response, unlike QYr.sgi-7D, which is believed to be the adult plant resistance gene Yr18. These two QTLs for adult plant resistance in Kariega appear to represent different forms of resistance, where QYr.sgi-7D may represent potentially more durable resistance than QYr.sgi-2B.1. Mixture model analysis of the field leaf infection scores suggested a genetic model involving two independent genes combining in a classical, epistatic manner. The results of the QTL analysis demonstrate its higher resolution power compared to the mixture model analysis by detecting the presence of minor QTLs
External Databases
Pubmed: 14963651
QTL
QYr.sgi-2B.1 QYr.sgi-2B.1_Kariega QYr.sgi-4A.2_Kariega QYr.sgi-4A.1_Kariega
Keyword
adult
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.
GrainGenes Reference Report: TAG-108-1426
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||