2013 Annual Report
Resistance to KB was identified in several experimental hard red winter wheat lines. One line with moderate resistance to KB was released as cultivar ‘TAM 401’ by Texas A&M University. A doubled haploid mapping population between a source of very high resistance (KRL22) and a susceptible line (WH542) was evaluated over four years at Ludhiana, Punjab, India and for three years at Obregon, Sonora, Mexico. Resistance segregated as a quantitative trait and heritability of resistance was moderately high. This population was also genotyped using the 90K wheat genotyping array. Data are being analyzed to find the locations of resistance genes for Karnal bunt as well as suitable linked molecular markers. A resistance backcrossing program using cultivar ‘Jagger’ as the recurrent parent was carried to the fourth backcross generation. A derivative of Jagger with very good agronomic type and very good resistance to Karnal bunt was developed.