Molecular mapping of QTLs for Karnal bunt resistance in two recombinant inbred populations of bread wheat |
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Authors: | Sukhwinder Singh Indu Sharma Sunish K Sehgal Navtej S Bains Zhigang Guo James C Nelson Robert L Bowden |
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Institution: | (1) Department of Plant Pathology, Kansas State University, Manhattan, KS 66506, USA;(2) Department of Plant Breeding, Genetics and Biotechnology, Punjab Agricultural University, Ludhiana, India;(3) USDA-ARS, Plant Science and Entomology Research Unit, 4008 Throckmorton Hall, Manhattan, KS 66506, USA |
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Abstract: | Karnal bunt (KB) of wheat, caused by the fungus Tilletia indica, is a challenge to the grain industry, owing not to direct yield loss but to quarantine regulations that may restrict international
movement of affected grain. Several different sources of resistance to KB have been reported. Understanding the genetics of
resistance will facilitate the introgression of resistance into new wheat cultivars. The objectives of this study were to
identify quantitative trait loci (QTLs) associated with KB resistance and to identify DNA markers in two recombinant inbred
line populations derived from crosses of the susceptible cultivar WH542 with resistant lines HD29 and W485. Populations were
evaluated for resistance against the KB pathogen for 3 years at Punjab Agricultural University, Ludhiana, India. Two new QTLs
(Qkb.ksu-5BL.1 and Qkb.ksu-6BS.1) with resistance alleles from HD29 were identified and mapped in the intervals Xgdm116–Xwmc235 on chromosome 5B (deletion bin 5BL9-0.76-0.79) and Xwmc105–Xgwm88 on chromosome 6B (C-6BS5-0.76). They explained up to 19 and 13% of phenotypic variance, respectively. Another QTL (Qkb.ksu-4BL.1) with a resistance allele from W485 mapped in the interval Xgwm6–Xwmc349 on chromosome 4B (4BL5-0.86-1.00) and explained up to 15% of phenotypic variance. Qkb.ksu-6BS.1 showed pairwise interactions with loci on chromosomes 3B and 6A. Markers suitable for marker-assisted selection are available
for all three QTLs.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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