Genetic Analysis of Resistance to Head Bug Eurystylus oldi (Poppius) in Sorghum (Sorghum bicolor (L.) Moench)

摘要

Genetic analysis were carried out to determine heterotic effects, gene action and inheritance of resistance to head bug, Eurystylus oldi Poppius in four sorghum crosses. Resistance was found dominant over susceptibility. Significant negative heteroticeffect above mid-parent and better parent for grain damage rating was detected for all crosses. Dominance gene action is more important for the three resistance traits: grain damage rating, floaters percentage and germination percentage Inheritance to E. oldi is conditioned by one dominant gene in two F_2 populations, while resistance in the remaining two F_2 populations is controlled by two dominant genes and in part by genes at two or more loci.