OAR@ICRISATInheritance of resistance to Sporisorium sorghi in grain sorghumH SNziokiauthorL EClaflinauthorP JBramelauthorB ARamundoauthorGreenhouse and field experiments were conducted in 1995, in Kansas, USA, to investigate the inheritance of resistance to covered kernel smut (Sporisorium sorghi) in sorghum cultivars B35-6, SC414 and Sureño. In all crosses, the susceptible parent was BTx623. Crosses were made between resistant and susceptible accessions to determine inheritance. Crosses between resistant accessions were used to determine if they possessed the same genes. Resistant parents remained immune to S. sorghi under both field and greenhouse conditions. The incidence (76%) of smutted panicles of BTx623 grown under greenhouse conditions was substantially higher than that in BTx623 grown in the field (2.3%). The reactions of F1 progenies of the crosses B35-6 × Sureño and Sureño × BTx623 suggest incomplete dominance of resistance. There was a very limited amount of F1 seed from the other resistant × susceptible crosses and therefore no conclusion could be reached on the reactions of their progenies to S. sorghi. A 3:1 ratio of resistant to susceptible plants was obtained in the F2 population of Sureño × BTx623, suggesting incomplete dominance. Higher smut incidence in the F1 progeny of Sureño × BTx623 was observed, indicating incomplete dominance of resistance from Sureno.Sorghum2001Article

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