Genetic analysis of resistances to leaf rust and stripe rust in Indian wheat cv. Sujata and NP876
Caixia Lan
Genetic analysis of resistances to leaf rust and stripe rust in Indian wheat cv. Sujata and NP876 - New Delhi (India) : BGRI, 2013.
Abstract Only
The tall Indian bread wheat cv. Sujata and NP876 possess adult plant resistance (APR) to leaf rust and display final rust severities of 10-15% and 15-20%, respectively, compared to 100% severity for the susceptible check Avocet in field trials conducted in Mexico. Sujata was highly resistant (1 MR) to stripe rust in the field and displayed intermediate infection types in seedling greenhouse tests. NP876 was susceptible to stripe rust in seedling tests, but displayed APR in field trials with 5-10% severity compared to 100% severity for Avocet. We developed 148 F5 recombinant inbred lines (RIL) mapping populations for each of the Avocet × Sujata and Avocet × NP876 crosses and phenotyped them for leaf rust reaction at Mexican field sites El Batan and Cd. Obregon during 2011-2013 and for stripe rust at Toluca during 2011 and 2012. Genetic analyses indicated the presence of three and five additive genes for resistance to leaf rust and stripe rust, respectively, in Avocet × Sujata, and four additive genes for resistance to both rusts in Avocet × NP876. The pleiotropic slow rusting resistance genes Lr46/Yr29 and Lr67/Yr46, detected based on markers csLV46G22 and Lr67SNP, were associated with APR in both populations. Resistance gene Lr67/Yr46 is likely derived from the common ancestor C591; however, the origin of Lr46/Yr29 remains unknown. Mapping of other resistance genes, including the gene that conferred seedling resistance to stripe rust in Sujata, is currently underway.
Text in English
Disease resistance
Rusts
Wheat
Plant Genetics
Genetic analysis of resistances to leaf rust and stripe rust in Indian wheat cv. Sujata and NP876 - New Delhi (India) : BGRI, 2013.
Abstract Only
The tall Indian bread wheat cv. Sujata and NP876 possess adult plant resistance (APR) to leaf rust and display final rust severities of 10-15% and 15-20%, respectively, compared to 100% severity for the susceptible check Avocet in field trials conducted in Mexico. Sujata was highly resistant (1 MR) to stripe rust in the field and displayed intermediate infection types in seedling greenhouse tests. NP876 was susceptible to stripe rust in seedling tests, but displayed APR in field trials with 5-10% severity compared to 100% severity for Avocet. We developed 148 F5 recombinant inbred lines (RIL) mapping populations for each of the Avocet × Sujata and Avocet × NP876 crosses and phenotyped them for leaf rust reaction at Mexican field sites El Batan and Cd. Obregon during 2011-2013 and for stripe rust at Toluca during 2011 and 2012. Genetic analyses indicated the presence of three and five additive genes for resistance to leaf rust and stripe rust, respectively, in Avocet × Sujata, and four additive genes for resistance to both rusts in Avocet × NP876. The pleiotropic slow rusting resistance genes Lr46/Yr29 and Lr67/Yr46, detected based on markers csLV46G22 and Lr67SNP, were associated with APR in both populations. Resistance gene Lr67/Yr46 is likely derived from the common ancestor C591; however, the origin of Lr46/Yr29 remains unknown. Mapping of other resistance genes, including the gene that conferred seedling resistance to stripe rust in Sujata, is currently underway.
Text in English
Disease resistance
Rusts
Wheat
Plant Genetics