Genetic Analysis of Yield Related Characteristics Using Line × Tester Mating Design in Rice (Oryza sativa L.)

Abstract

R-B-19. Five lines were crossed by seven testers to create 35 F1 cross. The data recorded on characters showed significant and highly significant differences among genotypes; parents, parents vs. crosses, crosses, lines, testers and line×tester for all studied traits except parents vs. crosses for grain yield /plant was non-significant. Preponderance of non-additive gene effect was shown by estimates of the ratio of general to specific combining ability, and degree of dominance for each characteristic. For the majority of the variables under study, the maternal genotypes GZ6296-12-1-2-1-1 and Sakha 106 had the best general combining ability effects. For the majority of the characteristics under study, Hangangchal1, IRI367and Namyang 6 were found to be effective general combiners. The cross combinations of Giza 177x HANGANGCHAL1 and Sakha 105 x IRI 367 were observed to be good specific combinations for grain yield and most of related traits due to highly significant specific combining ability effects and heterotic effects.