摘要
为了探讨柃属植物属下等级的系统演化路线及一些种的具体分类学地位,采用脉络法对国产柃属植物34种1变种进行了叶宏观结构比较研究,结果显示柃属植物脉序类型皆为环节曲行羽状脉,一级脉表现为较高的一致性,二级脉与一级脉的夹角为锐角或近直角,二级间脉为简单型或复合型,三级脉多为结网型,叶缘末级脉序结环或不完全,网眼的形状和大小不规则,发育不完全或不完善;这些特征存在种间差异,可用于类群的比较和鉴别。研究同时采用UPGMA法对所选16个叶宏观结构性状进行聚类分析,根据系统树的5个分支,讨论了柃属植物叶的基本演化路线。研究证明叶宏观结构特征对本属植物分类及系统演化关系具有重要意义。
Leaf architectural characteristics of 35 taxa from Eurya were examined to discuss the evolution route and the systematic positions of some species within Eurya. The result shows ： Venations of leaf in genus Eurya are all brochidodromous and camptodromus, there are little differences among the primary veins, the secondary veins＇ angle of divergence is acute or nearly right-angle, intersecondary veins are simple or compound; tertiary veins are usually reticulate, the margin ultimate venation are forming into a loop or incomplete; areoles are not uniform in shape and incomplete or imperfect in system development. These distinctive characteristics are different among species, which can be used to identify species. The leaf evolution route in Eurya was also discussed based on the five clades from phenetic analyses of 16 leaf architectural characteristics. The study indicates leaf architecture is very significant for classification and evolution of Eurya.
出处
《植物研究》
CAS
CSCD
北大核心
2009年第5期517-523,共7页
Bulletin of Botanical Research
基金
中山大学青年教师基金
关键词
柃属
叶宏观结构
脉序
演化路线
分类学意义
Eurya
leaf architecture
venation
evolution route
taxonomic significance
