小麥 品種間 交雜에 依한 稈長의 遺傳分析

Inheritance of culm length in five winter wheat(triticum aestivum L.) crosses

The objective of this study was to determine by using Hayman’s six parameter model whether epistasis played a significant role in the genetic systems for culm length among several winter wheat (Triticum aestivum L.) cultivars. Parents, F₁, F₂ and first generation backcrosses (B₁ and B₂) of five crosses were grown in the field of Wheat and Barley Research Institute in Suwon, Korea, from October, 1984 to June, 1985. There were some deviations between F₁s and their Mid-parent to suggest the presence of the considerably different degree of gene interaction of additive and non-additive depending upon crosses. Narrow-sense heritability estimates on culm length were very high for three crosses and moderate for two. GS(Gain from selection) of each cross ranged from 13 to 30%. Although additive and dominant gene action were considerable in most crosses, fitness of 3-parameter model was not significant for culm length of wheat crosses. Six-parameter model analysis showed that dominant x dominant epistasis, additive x additive epistasis and dominance gene action significantly affected the expression of culm length in most crosses.