Identification of microsatellite markers linked to leaf rust resistance gene Lr25 in wheat

The leaf rust resistance gene Lr25, transferred from Secale cereale L. into wheat and located on chromosome 4B, imparts resistance to all pathotypes of leaf rust in South-East Asia. In an F2-derived F3 population, created by crossing TcLr25 that carries the gene Lr25 for leaf rust resistance with le...

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Bibliographic Details
Published in:Journal of applied genetics 2012-02, Vol.53 (1), p.19-25
Main Authors: Singh, Anupam, Pallavi, J. K, Gupta, Promila, Prabhu, K. V
Format: Article
Language:English
Subjects:
Animal Genetics and Genomics
Biomedical and Life Sciences
Chromosomes
Controlled conditions
Genes
Genetic aspects
Genetic markers
Human Genetics
Leaf rust
Leaves
Life Sciences
loci
Microbial Genetics and Genomics
microsatellite repeats
Microsatellites
null alleles
pathotypes
Plant Genetics and Genomics
Plant Genetics • Original Paper
Secale cereale
Triticum aestivum
Wheat
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Summary:The leaf rust resistance gene Lr25, transferred from Secale cereale L. into wheat and located on chromosome 4B, imparts resistance to all pathotypes of leaf rust in South-East Asia. In an F2-derived F3 population, created by crossing TcLr25 that carries the gene Lr25 for leaf rust resistance with leaf rust-susceptible parent Agra Local, three microsatellite markers located on the long arm of chromosome 4B were found to be linked to the Lr25 locus. The donor parent TcLr25 is a near-isogenic line derived from the variety Thatcher. The most virulent pathotype of leaf rust in the South-East Asian region, designated 77–5 (121R63-1), was used for challenging the population under artificially controlled conditions. The marker Xgwm251 behaved as a co-dominant marker placed 3.8 cM away from the Lr25 locus on 4BL. Two null allele markers, Xgwm538 and Xgwm6, in the same linkage group were located at a distance of 3.8 cM and 16.2 cM from the Lr25 locus, respectively. The genetic sequence of Xgwm251, Lr25, Xgwm538, and Xgwm6 covered a total length of 20 cM on 4BL. The markers were validated for their specificity to Lr25 resistance in a set of 43 wheat genetic stocks representing 43 other Lr genes.
ISSN:1234-1983
2190-3883
DOI:10.1007/s13353-011-0070-0