Abstract: The relationship between the open type,upright type,weeping type,broom type,dwarf type and compact type peach leaf vein structure and the different growth habits of peach tree architecture were explored to provide a theoretical basis for the breeding of peach dwarfing and high density by using different growth habits of peach resources and early selection. The characteristics of tree structure,leaf shape and leaf vein structure were observed by using six growth habits of peach as materials. Moreover,the relationship between the six growth habits of peach tree structure and vein structure were analyzed. The results showed:The average angle of the leaves in six grow types of peach ranged from 62.76° to 73.50° and showed no obvious difference among each other. However,the branch angle exhibited significant difference among six growth types of peach. For the basal angle of 1st order branches,weeping type was maximum(93.92°) while dwarf type was minimum (36.75°),the other four growth type were medium. However,the lumbar angle and top angle of 1st order branches showed the similar change rules in the six growth types of peach which displayed the maximum level in weeping type and the medium level in open type,and exhibited no significant difference among four other growth types. The characteristics of leaf structure in six growth types of peach were also investigated. The leaf length of upright type which was minimum (11.01 cm),while its petiole length was maximum(2.41 cm). The leaf length and leaf width of compact type peach was 16.2 cm and 4.57 cm respectively,and possessed the maximum average leaf area (47.28 cm²). All the leaf veins of six growth habits of peach was eucamptodromous venation pinnate. The number of secondary veins of upright type was highest while the weeping type had the least secondary veins. The open type had the maximum angle while the dwarf type had the minimum angle. Correlation analysis of leaf vein structures and tree structures in six growth habits of peach was performed. The results indicated that there was a negative correlation between the numbers of secondary vein and the top angle of 1st order branches in open type,dwarf type and compact type,especially in open type which correlation coefficient reached a significant level (-0.970). In another hand,there was a positive correlation between the numbers of secondary vein and the top angle of 1st order branches in the uprigh type,weeping type and broom type. In the open type,dwarf type and compact type,the angle of secondary vein had a negative correlation with the top angle of 1st order branches and only in the compact type their correlation coefficient reached a significant level (0.953). There was a negative correlation between angle of secondary vein and the top angle of 1st order branches among the other three growth types. The differences of leaf secondary veins angle and the numbers of secondary veins of peach veins could reflect the changes of different growth types of peach tree structure in a certain extent. It could be a morphological marker for early selection of different growth types of peach.

Key words: Peach, Growth habits, Tree structure, Leaf vein

CLC Number: 

• S662.01