Paraphyly and Phylogenetic Relationships in Lasianthus (Rubiaceae) Inferred from Chloroplast rpsl6 Data

粗葉木屬(Lasianthus)的界定及其系統關係的分析來自葉綠體rps16的證據

肖龍騫(Long-Qian Xiao) ； 朱華(Hua Zhu)

《Botanical Studies》 48卷2期 (2007/04) Pp. 227-232

摘要

基於葉綠體rps16內含子序列對粗葉木屬(Lasianthus)和酋草亞科各個族的代表進行系統發育分析，結果表明：l)粗葉木屬是一個並系類群，因為厚梗染木(Saproma crassipes)作為子房有二室、核果含薄壁問開的兩個小堅果而歸屬上有爭議的一些種類的代表，以及單種屬的石核木(Litosanthes biflora)嵌入其中形成一個強烈支援的分支；2)粗葉木族由粗葉木屬Lasianthus、Saldinia和Trichostachys組成；3)粗葉木屬的分組關係沒有得到支持。

關鍵字

粗葉木屬 ； 粗葉木族 ； 石核木屬 ； 並系 ； rps16內含子

並列摘要

A phylogenetic analysis of Lasianthus and some representatives of tribes in subfamily Rubioideae based on the chloroplast rpsl6 data indicates that Lasianthus as currently circumscribed is paraphyletic, because Saprosma crassipes, representative of the species with two locules per ovary developing into two pyrenes per drupe with a thin wall, and Litosanthes biflora, the species in the monotypic genus Litosanthes, are nested within the highly supported Lasianthus clade. The present delimitation of the tribe Lasiantheae, which includes Saldinia and Trichostachys, is supported by our results. Finally, our results are inconclusive for evaluating the monophyly of the infrageneric classification of Lasianthus.

並列關鍵字

Lasianthus ； Lasiantheae ； Litosanthes ； Paraphyly ； rps16 intron