Study on the Leaf Trait Segregation of Apple Hybrid Seedlings and Application in Pre-selection

In order to explore the feasibility and practicality of leaf characters as the pre-selection index of apple hybrid seedlings.The leaf size,leaf length,leaf width,leaf shape index,leaf petiole length,leaf petiole diameter and leaf thickness of 572 hybrid seedlings of Fuji and Qinguan were used as materials for investigation,research and statistical analyze in 2007～2008,the result showed that leaf traits display extensive variability and leaf size was the largest in individuals;In hybrid groups,the change of leaf size show normal distribution of continuity and lobular type leaf accounted for a ratio of 8.97%～11.03%;The leaf characters of 3-year-old and 4-year-old hybrid seedlings were basically same and can reflect the characteristics of leaf traits,so can be as the beginning year of pr-selection;The variation coefficiency of leaf size was very large,and field surveying were practical and convenient,so can be as the effective leaf trait index for pr-selection of apple hybrid seedlings in large groups.