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一、核桃优良单株选择的依据核桃是雌雄同株异花,主要靠风力传播花粉的异花授粉植物,在自然授粉情况下,亲缘关系十分混杂。我省核桃生产中历来采用种子繁殖,其实生后代产生了极为广泛的变异。尽管在劳动人民长期栽培管理下,形成了许多优良品种类型,实际上这是一个遗传性状极其多样,而只有部分性状比较相似的复杂群体。根据生物的遗传特性,任何一个生物群体总是在某几个特征特性上表现很稳定,而在另一些特性上变异很大。因此,对异花授粉的核桃来说,由于实生繁殖的结果,表现型在遗传上的稳定性和群体的一致性是相对的,而性状的变异性和群体的异质性是绝对的。所以,单株之间千差万别,良
First, the basis for choice of walnut excellent single plant Walnut is monoecious and cross-pollination, mainly by wind-pollinated cross-pollinated plants, in the case of natural pollination, kinship is very mixed. The province has always been the production of walnut seed breeding, in fact, have a very wide range of offspring variation. Although many types of elite breeds have been formed under the long-term cultivation and management of working people, this is actually a complex group of individuals whose genetic traits are extremely diverse and only some of the traits are similar. Depending on the genetic characteristics of the organism, any one biological group is always stable over several characteristic features, while others vary greatly. Thus, for cross-pollinated walnuts, the phenotypic genetic stability and population consistency are relative as a result of in-shoot reproduction, while trait variability and population heterogeneity are absolute. Therefore, between different strains, good