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- 저자 : Gopal SUBRAMANYA (검색결과 1 건)
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Gopal SUBRAMANYA,Stephen C. BISHOP 한국곤충학회 2011 Entomological Research Vol.41 No.1
Three different races of lepidopteron silk moth Bombyx mori were used in reciprocal and inter se crosses to determine heterosis effects at F₁and recombination loss at the F₂generation for three fitness traits (fecundity, larval duration, survival rate) and four productivity traits (larval weight, cocoon weight, shell weight, filament length). Eleven mating types were represented in the present study, including three pure breeds and a variety of F₁and F₂populations arising from regular and reciprocal crosses, respectively. Equations were derived to evaluate heterosis, maternal and overdominance effects for the above traits. Estimates of heterosis and overdominance effects revealed significant heterosis effects for all the traits, but overdominance was only seen for larval duration (favorable effect) and survival rate (unfavorable effect). Maternal effects were significant for the majority of the traits under study. The results revealed significant reduction for all the quantitative traits from F₁to F₂, except for larval duration. The most obvious explanation for the reduction of fitness parameters and productive traits is the reduction in heterozygosity from F₁to F₂(it is expected that one half of the heterozygosity of F₁is lost in F₂). For larval duration this explanation seems insufficient and breakdown of epistatic gene effects (i.e. recombination loss) has been suggested.
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