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Phylogenetic position of Schnabelia,a genus endemic to China:Evidence from sequences of cpDNA matK gene and nrDNA ITS regions

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Chinese Science Bulletin 2003年第15期48卷 1576-1580页

作者： SHISuhua DUYaqing D.E.Boufford GONGXun huangyelin HEHanghang ZHONGYang StatekeyLaboratoryforBiocontrol SchoolofLifeSciencesZhongshanUniversityGuangzhou510275China HarvardUniversityHerbaria 22DivinityAvenueCambridgeMA02138-2020USA

The chloroplast gene matK and the internal transcribed spacers (ITS) of the nuclear ribosomal DNA from Schnabelia, a genus endemic to China, and 6 genera of Verbenaceae and 13 genera of Lamiaceae were sequenced. The phylogenetic signal and validity outgroups were measured and evaluated by means of the relatively apparent synapomorphy analysis (RASA). Independent and combined phylogenetic analyses for the matK and ITS sequences were performed using the maximum parsimony (MP), neighbor- joining (NJ) and maximum likelihood (ML) methods, indicating that Schnabelia oligophylla and Caryopteris terniflora form a sister-group relationship. The Caryopteris complex is not shown to be a monophyly because Trichostema, C. paniculata and C. forrestii are paraphyletic to the clade containing the remaining members of the complex. A monophyly of Ajugoideae proposed by Cantino et al., including 8 genera in this study, is strongly supported and the closest relatives of Schnabelia are in the Ajugoideae (Lamiaceae), especially near Caryopteris terniflora. The polygenetic analyses also showed that the genera of Lamiaceae and Verbenaceae sampled in this tudy are phylogenetically mixed and the genus Avicennia is distant to other genera of Verbenaceae. RASA and combined analysis can be used as effective approaches to determining the relationships among phylogenetically complex groups.

关键词：中国共源性状分析脱氧核糖核酸植物学

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