Inheritance of resistance to sorghum midge and leaf disease in Sorghum in Kenya uri icon

abstract

  • Gene action for sorghum (Sorghum bicolor) resistance to midge (Stenodiplosis sorghicola) and some leaf diseases (anthracnose caused by Colletotrichum graminicola, zonate leaf spot by Gloeocercospora sorghi, leaf blight by Exserohilum turcicum (Setosphaeria turcica) and rust by Puccinia purpurea) was studied in 2 midge-resistant (ICSA 88019 and ICSA 88020) and one commercial midge-susceptible (ICSA 42) cytoplasmic male sterile (CMS) lines, in an experiment conducted in Kenya in 1994. Twelve genotypes identified as resistant to sorghum midge were used as restorers. Of the 12 restorer lines, IS 22778, IS 18698 and IS 8891 showed moderate resistance to sorghum midge in Kenya. Genotypes DJ 6514, ICSV 197 and ICSV 745 that are highly resistant to midge in India, showed susceptibility to midge in Kenya. B-lines ICSB 88019 and ICSB 88020 that are resistant to midge in India, also showed susceptible reactions in the experiment. Resistance to midge was governed by the additive gene action. Restorers that showed resistance to midge in Kenya did not combine with midge-resistant CMS lines ICSA 88019 and ICSA 88020. Restorer lines IS 27103, IS 8891, ICSV 197 and DJ 6414 produced leaf disease-resistant resistant hybrids in combination with all 3 CMS lines, indicating that resistance to some of the leaf diseases is dominant

publication date

  • 2000