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Abstract

Genetic analysis of 11 yield traits were performed using six generations of four biparental crosses, each involving powdery mildew resistant (It-96; No.267) and susceptible parents (Climax; PF-400) in pea. Scaling assays revealed that all three forms of non-allelic interactions were present (additive × additive [i], additive × dominance [j] and dominance × dominance [l]) for almost all yield contributing traits. Moreover, it was found that only simple additive dominance model was not fit for these traits. Generation mean analysis has confirmed the influence of both additive and non-additive genetic effects in controlling the inheritance of all traits. Additive genetic effects [d] were controlling the inheritance of majority traits. With few exceptions, it was found that additive genetic effects [d] were smaller than the corresponding dominant genetic effects [h]. In most of the traits, [d] genetic component was smaller than [i], [j] and [l] genetic components, again suggesting the role of additive and non-additive genes in controlling their inheritance. Smaller than unity degree of dominance suggested the presence of partial dominance in determining their genetics. Significant positive mid parent heterosis, inbreeding depression and high heritability estimates were prevalent for most of yield related traits. Keeping in view the interplay of different genetic components in controlling the inheritance of different yield related traits and powdery mildew resistance in pea, back cross breeding method is recommended to have high yielding genotypes with powdery mildew resistant background

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