Study On Juvenile Trait Of Leaf In Apricot Hybrid Seedling And Probe To Period Transition

The fruit seedling's juvenile phase, which is the period from its seeding toits first blossom, is a little long, it has become one of the problems puzzlingthe breeding experts. many experts explored it from the seedling's morphology,anatomy, physiology, inner material, endocrine on the apple, pear, crabapple,peach in order to explain the juvenile phase and shorten it, and made someprogress. From the time and space aspects this paper studied the leaf'smorphology, anatomy, physiology indexes on the hybrids of Katy×Xinshijiapricot about 2-year juvenile phase on contrast of 3-year, 4-year,5-yearjuvenile phase. The results preliminary showed that:1. On the 2-year juvenile phase seedling, the leaf area, leaf weight, leafthickness, palisade tissue thickness and DNA content of the adult zone's leaveswere higher than those of the juvenile zone and the transition zone, but thedifference weren't significant; the free amino acid, chlorophyll, soluble sugar,starch contents of the adult zone's leaves were clearly higher than those of thejuvenile zone, the difference were significant, but the difference weren'tsignificant to the transition zone's corresponding indexes; the reducing sugarand the RNA content between the juvenile zone leaf and the adult zone leafhadn't significant difference, but they were clearly lower than those of theadult zone leaf; the soluble protein content of the adult zone's and thetransition zone's leaves hadn't significant difference, but they were clearlyhigher than that of the juvenile zone leaf. The juvenile traits of juvenile zoneof 2-year juvenile phase were not obvious.2. On the 4-year juvenile phase seedling, the DNA content differencewasn't significant between these three zones; these indexes such as the leafarea, leaf weight, leaf thickness, palisade tissue thickness, chlorophyll, freeamino acid, soluble sugar, starch, soluble protein, became higher graduallyfrom the juvenile zone, the transition zone to the adult zone, there existedsignificant difference between each other; the reducing sugar content and theRNA content of the juvenile zone leaves were clearly lower than those of the...