Introgressing resistance to Turcicum leaf blight and mapping of associated quantitative trait loci in sorghum

Résumé Research Application Summary Introgressing resistance to Turcicum leaf blight and mapping of associated quantitative trait loci in sorghum Mayada Mamoun Beshir1, 2, Okori, P.1, Abdelbagi Ali, M.2 & Gibson, P.1, 3 1Department of Crop Science, Makerere University, P .O. Box 7062, Kampala, Uganda 2Agricultural Research Corporation, P. O. Box 126, Wad Medani, Sudan 3Department of Plants, Soils, and Agricultural Systems, Southern Illinois Universith, Carbondale, Illinois, USA Corresponding author: [email protected] Screening for Turcicum leaf blight was carried out in F2 and F2:3 segregating sorghum populations under field and controlled conditions. Disease severity as a percentage of leaf area covered by lesions was computed and the lesion type was characterized. The disease severity of F2 plants indicated a major dominant gene for resistance while F2:3 disease scores suggested quantitative inheritance. The two lesion types segregated monogenically among the F2:3 lines. Single marker analysis showed that the major gene for the resistance to Turcicum leaf blight is probably located close to the sorghum plant’s locus for colour and to Xtxp95 in the sixth chromosome in the sorghum genome map.