Abstract
<p>Genetic parameters of a character, which is estimated using genetic analysis approach, is important in a character improvement. The aim of this research was to examine the gene action of days to maturity character on soybean using generation mean analysis. The research consisted two steps, first was preparing four populations (F1, BC1.1, BC1.2 and F2) of three single crosses, i.e. Nanti × Grobogan, Grobogan × Malabar, and Nanti × Malabar. The second step was testing those populations consisting of P1, P2, F1, F2, BC1.1 and BC1.2 in the field at Jambegede Experimental Station, Malang, East Java, from July to September 2009. The results showed that there were interaction between the gene loci on the inheritance of days to maturity, from the three cross combinations under study. The role of additive gene action and the influence of dominant inheritance contributed jointly, affecting days to maturity of early maturity (Grobogan) and early maturity (Malabar) cross. The crossing of very late maturity (Nanti) with early maturity (Grobogan or Malabar) showed that early maturity was probably controlled by additive recessive genes.</p>
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