白三叶种质资源形态变异与地理起源的关系

分析了原产于1.02°~55.8° N，87.12° E~8.9° W，海拔2～2 804 m，分属于29个国家的68份白三叶（Trifolium repens）种质资源的形态特征变异及其与地理起源的关系。结果表明，1）供试白三叶叶片大小变异最大，其次是单位面积花序数和株高，而生殖枝高度和每花序小花数变异较小；2）Mantel检验表明，株高、单位面积花序数、每花序小花数3个性状变化存在显著（P＜0.05）的空间关联性，而生殖枝高度和叶面积与空间的相关性不显著；3）聚类分析显示，白三叶形态变异与地理起源呈较密切的相关性，而不同起源的白三叶亦出现了相似的遗传分化，原产欧洲的白三叶形态朝不同方向的进化趋势明显。

Study on the relationship between morphological variation and geographic origin for white clover

Morphological characteristics and the relationship between morphological variation and geographic origin in 68 accessions of white clovers (Trifolium repens) were estimated. These white clovers were at latitude of 1.02° N-55.8° N, at longitude of 87.12° E-8.9° W, in elevation of 2-2 804 m and belonged to 29 countries. The results showed that the largest variation was found in leaf area, followed by inflorescences per unit area and plant height, and the less variation was found in height of fertile tillers and florets per inflorescence. Mantel test showed that changes of three characters, including plant height, inflorescences per unit area and florets per inflorescence, existed significant spatial correlation, while the correlation was not significant between leaf area (or height of fertile tillers) and spatial distribution. Cluster analyses showed that there was significant correlation between morphological variation and geographic origin of white clovers and different origin of white clovers had similar genetic differentiation. The morphological variation in white clovers originated in European showed different evolutionary direction