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对12个组合1505株梨杂种实生苗童期长短的观察看出:砂梨与白梨的种间杂种的童期为4～5年,少数后代在3年生时可开始结果,童期变幅为3～8年,白梨的品种间杂种为5～6年,童期变幅为4～9年。每一组合杂种间童期的长短表现出分离现象。亲本品种童期性状的基因型为异质结合型,童期呈极数量性状遗传。童期的长短受双亲遗传特性的制约,童期不属母性遗传。亲本营养期与杂种童期之间呈显著正相关(r=0.92)。以营养期短的品种作亲本可以产生童期短的后代,反之则长。
The observation of the length of the 12 combinations of 1505 pear hybrid seedlings showed that: the interspecific hybrids between sand pear and white pear had a period of 4 to 5 years, and the few offspring started to bear fruit at the age of 3 years. For 3 to 8 years, white pear varieties between 5 to 6 years, childhood amplitude ranged from 4 to 9 years. The length of each inter-hybrid show a separation between the length of the period. The genotypes of the parental traits of childhood were heterozygous, with a very high number of traits inherited in childhood. The length of childhood is limited by the genetic characteristics of parents, and childhood is not maternal genetic. There was a significant positive correlation between the parental vegetative phase and the hybrid childhood (r = 0.92). Short varieties of nutrition as a parent can produce short offspring of childhood, and vice versa.