Genetic analysis of green period of Zoysia.

Two Zoysia F1 segregating populations of the reciprocal crosses of Z136 and Z039 were obtained,and the heredity of the green period in two F1 populations(Z136×Z039 and Z039×Z136) was analyzed by the major gene and polygene mixed genetic model to show the underlying genetic.The variation in range of green period of both crosses was 178-261 and 188-253 d,well beyond that of either of their two parents(248 and 231 d).The average green period of reciprocal crosses were 223.6 and 216.8 d and the significant differences between the two reciprocal crosses further indicated three were maternal genetic effects for the green period in Zoysia.Second,there was a large difference in the genetic models between the two reciprocal crosses: The effect of maternal genetic and of environment were both significant to the green period.No single major gene model(A-0) was the most suitable for the green period of Z136×Z039,but the green period of the reciprocal cross Z039×Z136 were controlled by two equal additive major genes.The most suitable model is B-4 and the heritability of major genes of the green period of reciprocal crosses was 94.35%.