含笑亚族及其近缘植物matK基因序列分析

Phylogenetic Relationships between Michelia (Magnoliaceae) and Its Related Genera Based on the mat K Gene Sequence

测定了木兰科等１４种植物的叶绿体ｍａｔＫ基因的一段长１０３９碱基对的序列．最大同源性分析构建的系统树图建议：①与一般的分类系统的结果一致，含笑属的３个种间具有极高的同源性；②合果木属、观光木属与含笑属之间的同源性也很高，建议它们有可能可以归为同一亚族，甚至归为同一属；③与一般分类系统相反，长蕊木兰属与木兰属的关系较远而与含笑属极接近，故有可能归入含笑亚族．

The sequences of a segment of the mat K gene from 14 species of the Subtribe Micheliinae and the related groups of Magnoliaceae were analyzed in this study The phylogenetic trees based on the maximum homological analysis suggested:① Consistent with the former systems, the three species within the genera Michelia were extremely homologious ② Paramichelia and Tsoongiodendron were also highly conservative to Michelia which suggested they would be treated as the same subtribe, or even as the same genera ③ Contrast to former classifications, Alcimandra was much closer to Michelia than to Magnolia, and it could be classified in the subtribe Micheliinae