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掌握杂种后代遗传变异规律,是提高选种效果的重要途径。但由于番薯长期异花授粉的结果,异质性比较强,遗传性比较复杂,使品种性状高度杂合,杂种第一代产生巨大的分离,出现着多种多样的性状,因此,一般难找到普遍性的遗传变异规律。但也有一些性状的出现,与双亲有密切关系,掌握这些规律性,对亲本选配和杂种后代的选择,都有指导意义。 (一)番薯杂种一代性状变异情况的分析 I.产量变异情况番薯通过有性杂交,其后代在产量上变异是比较大的。从表1资料看,出现中间类型比
Grasp the genetic variation of offspring of hybrids is an important way to improve selection effect. However, due to the long-term cross-pollination of sweet potato, the heterogeneity is rather strong and the heredity is rather complicated. As a result, the traits of hybrids are highly heterozygous and the first generation of hybrids have a huge separation with a great variety of traits. Therefore, it is generally difficult to find Universal genetic variation. However, there are also some traits that appear to be closely related to parents and master these regularities, which are instructive for the selection of parents and hybrid offspring. (A) sweet potato hybrid generation variation analysis of the situation I. Yield variation sweet potato through sexual cross, the offspring in the yield variation is relatively large. From the data in Table 1, the middle type ratio appears