コカブの育種に関する研究 : 第1報 遺伝力と優性度の推定

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  • Studies on the breeding of Vrassica raoa, L. : 1. Estimation of the heritability and degree of dominance

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For the purpose of studying the effect of selection within a population of the small turnip “Kanamachi”, the heritabilities and the degrees of dominance were estimated for weight, leaf number, neck diameter, root thickness, index of root shape and tap-rot diameter by using the data of biparental progenies within a population (the experimental procedure was the same as Experiment I. of COMSTOCK and ROBINSON, 1952)and the double of regression foefficient of progeny on male parent and on female parent. The degree of dominance was estimated from “a”=√(2(F-M)/M) and σa2/σg2 by the method of Comstock et al., It was considered that the heritablilty values estimated were nearly zero weight and root diameter, and were low (5-20 percent) in the other characters except the index of root shape which showed 33-36 percent estimates. The estimates obtained by the three method agreed fairly well. In the root shape, no dominance was observed, but in the others, overdominance was detected by this mithod. Granting that overdominance observed in this experimint is partly caused by overestimation due to the method adopted, it still seems right to conclude that strong dominance effect of genes affects thses chearacters. Finally, in thses characters except index of root shape, the effect of selection cannot be exaected, because hiritability values are very low and degrees of dominance which may be overdominance are fairly higy.

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