梨杂交后代童期和童程的研究

以八个梨杂交组合后代492株实生树为试材，调查了其童程、始花节位数、节间长度和树干直径，探讨了童期和童程以及二者的关系。结果表明：在调查所有杂交组合中，有68.7%的杂种实生后代童期为3-5年，平均童程为214.26cm；节间长度与童程存在正相关性，始花节位数和干径都与童程存在极显著的正相关；童期与童程存在极显著的正相关，表明矮化的植株具有早结果的潜力。

A Study on the Juvenile Phase and Juvenile Span of the Hybrid Progenies in Pear

492 seedlings from 8 crosses of pear were used to investigate the juvenile span、first flower node number、internode length and the trunk diameter. In order to provide reference for breeding work of pear, the relationship between juvenile phase and juvenile span was discussed. The results showed that the juvenile phase of 68.7% seedling progenies was 3 to 5 years at the materials, and the value of juvenile span was 214.26 centimeters. There was a positive correlation between internode length and juvenile span. The juvenile span was remarked significant positive to the first flower node number and the trunk diameter. The results also indicated that the juvenile phase was remarked significant positive to the juvenile span, and the plants of dwarfing had the potential of early bearing.