Variation Analysis of Leaf Traits of Ulmus pumila Clones
Leaf characteristics play an important role in the genetic improvement of plants.Investigating the variation in leaf characteristics among the clones of Ulmus parvifolia Jacq.(U.parviflora)will contribute to the breeding of superior varieties of U.parviflora.In this study,22 superior clones of U.parviflora were surveyed for leaf length,leaf width,length-width ratio,leaf perimeter,leaf area,leaf fresh weight,leaf dry weight,leaf thickness,and specific leaf area.The differences in leaf characteristics were analyzed,and the correlation and clustering analyses of these characteristics were conducted.The results showed significant differences(P＜0.001)in leaf characteristics among the clones,with variation coefficients exceeding 10％.Specific leaf area showed a negative correlation with other leaf characteristics.Cluster analysis divided the 22 clones into three groups:Group Ⅰ included 7 clones,Group Ⅱ included 1 clone,and Group Ⅲ included 14 clones.The clone in Group Ⅱ(SD02)had the highest leaf thickness and the smallest specific leaf area,indicating good potential for drought resistance and suitability for selecting drought-tolerant varieties of U.parviflora in the future.
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