Authors: H S Bariana N Parry I R Barclay R Loughman R J McLean M Shankar R E Wilson N J Willey M Francki
Publish Date: 2006/01/25
Volume: 112, Issue: 6, Pages: 1143-1148
Abstract
An uncharacterized source of seedling resistance to Puccinia striiformis fsp tritici was identified in an advanced wheat breeding line WAWHT2046 Genetic analysis based on a WAWHT2046/Carnamahderived double haploid DH population demonstrated monogenic inheritance of seedling stripe rust resistance in WAWHT2046 The gene controlling stripe rust resistance in line WAWHT2046 was tentatively designated YrWA The chromosome 5AL located awn inhibitor gene B1 possessed by WAWHT2046 also showed monogenic inheritance when the DH population was scored for the presence and absence of awns Joint segregation analysis at the B1 and YrWA loci indicated genetic linkage between the two loci A recombination value of 122 cM was computed using Mapmanager This association located YrWA in the chromosome arm 5AL Molecular mapping using microsatellite markers placed YrWA distal to B1 All molecular markers mapped proximal to the awn inhibitor locus B1 As no other stripe rust resistance gene is reported to be located in the chromosome arm 5AL YrWA was permanently designated as Yr34 Yr34 produced an intermediate 23C seedling infection type and expressed very low stripe rust response 10RMR on adult plants in the field similar to the resistance gene Yr17 In addition to Yr34 this mapping population segregated for three genetically independent adult plant stripe rust resistance genes The detection of DH lines with completely susceptible response higher than that shown by the Yr34lacking parent Carnamah suggested that both parents contributed adult plant resistance The use of WAWHT2046 as a parent in breeding programs would also contribute APR in addition to Yr34
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