PJB-2019-598
GENERATION MEANS ANALYSIS OF YIELD TRAITS IN PEA WITH POWDERY MILDEW RESISTANT/SUSCEPTIBLE BACKGROUND
Muhammad Abubakkar Azmat
Abstract
Genetic analysis of 11 yield traits was done 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 tests indicated the presence of all three types of non-allelic interactions (i, j and l) for almost all yield contributing traits. Moreover, it was found that only simple additive dominance model was not fit for these traits. Generation means 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 indicated the presence of partial dominance in controlling 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. Keywords: Degree of dominance, Genetic analysis, genetic components, heterosis, heritability
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