Generic Limits in Bromeliaceae Subfamily Tillandsioideae Using cpDNA Restriction Analysis

凤梨科（菠萝科）是新世界热带和亚热带维管附生植物群的重要组成部分。该科大约包含2500种，通常被认为是单系的，最近的分子研究表明，Tillandsioideae亚科（剔除肾小球属）也是单系的。相比之下，亚科中剩余的5个属中的4个（Tillandsia, Vriesea, Guzmania, Mezobromelia），涵盖了800多个物种，仅根据一两个特征进行人工分组。最近的形态学和初步的叶绿体DNA （cpDNA）数据表明，第五属Catopsis是单系植物。本研究的目的是利用从一组精选的代表性物种中获得的cpDNA限制性位点数据，构建Tillandsioideae亚科的一般水平系统发育假设。该分子系统发育将用于评估Tillandsioideae的形态特征状态变化，并为该亚科未来基于系统发育的属级分类修订提供框架。

The Bromeliaceae (Pineapple Family) is an important component of the vascular epiphyte flora of the New World tropics and subtropics. The family, which contains an estimated 2,500 species, is generally considered to be monophyletic, and recent molecular studies indicate that subfamily Tillandsioideae (with the genus Glomeropitcairnia removed) is also monophyletic. In contrast, four of the five remaining genera within the subfamily (Tillandsia, Vriesea, Guzmania, Mezobromelia), which encompass over 800 species, represent artificial groupings based on just one or two characters. Recent morphological and preliminary chloroplast DNA (cpDNA) data suggest that the fifth genus, Catopsis, is monophyletic. The objective of this research is to construct generic level phylogenetic hypotheses for subfamily Tillandsioideae using cpDNA restriction site data obtained from a group of selected, representative species. This molecular phylogeny will be used to evaluate morphological character state changes within Tillandsioideae, as well as form the framework for future phylogenetically based generic level taxonomic revisions within the subfamily.