Allelic relationship among genes for resistance to Karnal bunt (Tilletia indica) in bread wheat
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Authors
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SWATI* PRASHANT GOEL
Abstract
Karnal bunt is a potential threat to international trade of commercial grain and wheat germplasm, as importing countries insist on zero tolerance level. All the F1 progenies showed resistant type of response towards Karnal bunt; however, segregation in the F2 generations revealed that resistant parents had a different set of genes conferring Karnal bunt resistance. Two crosses namely, HD-29/HP-1531 and WH-485/HD-29 segregated in the pattern of 13 (resistant): 3 (susceptible) indicating that resistance to karnal bunt is controlled by two dominant genes and the genes interacted with each other in dominant recessive manner. On the other hand, WH-485/HP-1531 gave a ratio of 15:1 (resistant/susceptible) indicating the duplicate dominant type of gene action. BC2 populations segregated in 3:1 (resistant/susceptible) ratio, which again confirmed the results of F2 generations.
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