二面交雜에 依한 大豆의 世代別 量的形質의 遺傳分析

Diallel Analysis on Some Quantitative Characters of Soybeans in F₁ and F₂ Generations

Seven parents, F₁ and F₂ hybrids of twenty one crosses by the diallel crosses among these seven soybean varieties were used as the materials. and genetic studies were conducted by the randomized block design. Those plants were evaluated for 10 agronomic characters and all methods utilized were similar in detecting line giving unexpected performance in the F₁ and F₂ generations. In the both generations, partial dominance was exhibited on flowering, maturity, plant height, branch numbers and 100 grain weight etc., and over-dominance on pod numbers, but the other characters were differ from F₁ and F₂ generations. It is apparent that Hill, Kwang kyo, Kyung nam No. 2 appear to be contained most of the dominant genes for grain and pod numbers, since their cluster around the lower left end of the regression line. For five characters, flowering, flowering to maturity, maturity, plant height and 100 grain weight, the degree of dominance from √H₁/D was lesser than 1, indicating partial dominance, and lower value of H₁ than those of D was indicated that greater effect. Negative F values for flowering, stem diameter, branch numbers and 100 grain weight were indicated on excess of recessive alleles over dominant alleles. Apparent dominance asymmetry of positive and negative alleles were indicated, as H₂/4H₁ was less than 0.25 for all the characters except for plant height, stem diameters and 100 grain weight.