云南金钱槭果实、种子形态分化研究

Morphological Differentiation of Samaras and Seeds of Dipteronia dyeriana (Aceraceae)

对 5个云南金钱槭 (DipteroniadyerianaHenry)天然居群的果实、种子形态进行研究。测量了果实和种子的长度、宽度、重量等 1 2个表型性状指标。数据统计结果显示 :5个云南金钱槭居群按果实、种子大小进行排序为 :蒙自 (MZ) >屏边 (PB) >文山 1 (WSh1 ) >文山 3(WSh3) >文山 2 (WSh2 )。表型性状在居群内和居群间均存在着一定程度的变异 ,其中居群间变异系数的平均值从 0 0 6 4(果实整体形态 ,PL PB)到 0 1 97(种子重量 ,SW ) ,相比之下果实整体形态最为稳定。居群间形态总体差异显著性配对t检验结果说明 ,多数居群间已产生较明显的形态分化。Ward聚类和相关分析结果都表明表型性状与生态因子、海拔高度之间存在着一定程度的相关性 ,多种生态因子的共同作用是导致果实。

The samaras and seeds of Dipteronia dyeriana Henry were collected from five natural populations in Wenshan(WSh1,WSh2,WSh3), Mengzi(MZ), Pingbian(PB) of Yunnan province. Based on the data of twelve morphological characters of samaras and seeds, the morphological differentiation in the five populations was studied. The statistic analysis result shows that, according to the size of the samaras and seeds, the order of 5 populations is MZ>PB>WSh1>WSh3>WSh2. There exist morphological differences among and within populations of D dyeriana ,the average variation coefficiences among populations range from 0 064(hological shape of samaras, PL/PB) to 0 197(weight of seeds, SW), and the PL/PB is a relatively stable character. Paired t test of the significance of the general inter populations morphological variations indicates that there is an evident differentiation among most populations. Correlation analysis and Ward's cluster analysis presents the certain relationship occurs between ecological factors,altitude and morphological characters to some extent. The interaction of manifold ecological factors is the main reason for morphological differentiation of D dyeriana Henry.