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KMID : 1041219850270020007
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Journal of Sericultural and Entomological Science
1985 Volume.27 No. 2 p.7 ~ p.19
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The Analysis of the Genetic Variance and Combining Ability in some Quantitative Characters by Diallel Crosses of the Silkworm, Bombyx mori L.
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Abstract
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The genetic variances and combinding abiliy of the some useful characters were analyzd on sixty four combinations in the 8 Ｘ 8 diallel cross using the four Japanese races(Jam 1()7, Jam 113, Jam 117 and Jam 119) and the four Chinese races(Jam 108, Jam 114, Jam 118 and Jam 120). The eight quantitative characters were the total larval stage period(TP), the fifth larval instar period(FP), the female cocoon total weight(FW), the male cocoon total weight(MW), the female cocoon layer weight(FL), the male cocoon layer weight(ML), the female cocoon layer ratio(FR), and the male cocoon layer ratio(MR).
The results were as follows:
The analysis of the genetic variance and the combining ability in the TP and the FP.
In TP and FP, h3N was less than h2B. The GCA, SCA and RCA were at a high significant level. JIl/D and (Hl/D)1/2 were large. The heterosis were small minus. E and D were large. The r was in the positive direction, because the recessive genes were mainly expressed as a short rearing periods. The regressions of the characters were passed below 0 point, brcause the characters in the TP and the FP were appeared overdominant. Tlle order of the dominance in the TP of the parents were in the orders of Jam 119>Jam 113>Jam 117>Jam 108>Jam 120>Jam 114>Jam 107>Jam 118, and that in the FP of the parents were followed in the orders of Jam 117>Jam 113>Jam 108>Jam 114>Jam 119>Jam 107>Jam 120>Jam 118.
The analysis of the genetic variance and the combining ability of the FW and the MW.
In the FW and the MW, h2N was less than h2B. The GCA and SCA were large but RCA was little. Hl/D and (IIl/D)1/2 in the parents were large. Heterosis was large. E was appeared large in the FW, and small in the MW. D was small. The r was of the minus direction, because the dominance genes were less expressed. The regression of the these characters were padded below 0 point, because the characters in FW and MW were appeared overdominant. The orders of the dominance in the FW of the parents were as the order of Jam 107>Jam 108>Jam 119>Jam 113>Jam 114>Jam 120>Jam 117>Jam 118, and in the MW of them in the order of Jam 114>Jam 120>Jam 108>Jam 113>Jam 107>Jam 119>Jam 117>Jam 118.
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