临沧市16种野生石斛果实和种子形态特征研究

Study on Fruit and Seed Morphological Characteristics of 16 Wild Dendrobium Species in Lincang City

为了探究石斛果实和种子形态特征在石斛属植物分类中的应用价值,以云南省临沧市16种野生石斛为材料,对其果实、种子和胚的形态进行了观察、测量和描述;根据果实的长、宽、横切形态和种子颜色,采用模糊隶属函数法和频数分布表对果实进行分类,基于果实和种子的形态数据对16种石斛进行了聚类分析。结果表明:16种石斛的果实和种子的长、宽和长宽比的变异系数均高于15%,其中果实的宽和长宽比变异系数高于30%,果实横切特征可作为石斛种类识别的特征之一。基于果实和种子形态特征的聚类分析结果与传统分类大部分相符,对石斛属的分类具有一定的指导意义。

In order to explore the application value of the fruit and seed morphological characteristics inDendrobium classification,Fruits,seeds and embryos of 16 wild Dendrobium species in Lincang City,wereobserved,measured and described.According to the fruit’s length,width,transection and seed color,the fruit was classified by Membership function method and frequency table.The cluster analysis of 16 Dendrobium species was carried out based on the morphological data of fruit and seed.The results show that coefficient of variation of fruit and seed length,width and aspect ratio of 16 Dendrobium species were all higher than 15%,and were higher than 30%in fruit width and length-width ratio,transection characteristics of fruit can be used as one of the characteristics for Dendrobium classification.The results of cluster analysis based on fruit and seed morphological characteristics are mostly consistent with the traditional classification,which has some guiding significance for the classification of the Dendrobium genus.