结缕草属植物青绿期的遗传分析

选用结缕草属植物青绿期2个极端类型材料Z136和Z039相互杂交,获得正反交F₁分离群体,应用植物数量性状主基因+多基因混合遗传模型分析方法对F₁群体青绿期进行遗传分析,以初步明确结缕草属植物青绿期的遗传特性。结果表明,1)正反交后代的青绿期变异范围均较大,正交的变异范围为178~261 d,反交的变异范围为188~253 d,均远远超出了双亲的青绿期(248和231 d),正反交后代的平均值分别为223.6和216.8 d,两者存在显著差异,结缕草属植物的青绿期有母体遗传效应。2)正反交的遗传模型差异较大,母体遗传效应和环境效应对青绿期的影响明显,正交F₁群体青绿期的最适遗传模型为A-0模型,即无主基因模型,而反交F₁群体青绿期的最适遗传模型为B-4模型,即2对主基因的等加性遗传模型,且反交的主基因遗传率较高,为94.35%。

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%.