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AOBPreview published online on February 1, 2008
Annals of Botany, doi:10.1093/aob/mcm332
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© The Author 2008. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Phylogeny of Sinojackia (Styracaceae) Based on DNA Sequence and Microsatellite Data: Implications for Taxonomy and Conservation

Xiaohong Yao1, Qigang Ye1, Peter W. Fritsch2, Boni C. Cruz2 and Hongwen Huang1,*

1 Wuhan Botanical Garden, The Chinese Academy of Sciences, Moshan, Wuhan 430074, China
2 Department of Botany, California Academy of Sciences, 875 Howard Street, San Francisco, CA 94103, USA

* For correspondence. E-mail huanghw{at}mail.scbg.ac.cn

Received: 30 May 2007    Returned for revision: 12 September 2007    Accepted: 5 December 2007   

Background and Aims: The genus Sinojackia consists of eight species, all endemic to China. All species of Sinojackia are endangered or threatened owing to poor recruitment within populations. Information on molecular phylogenetics is critical for developing successful conservation strategies for this genus.

Methods: Combined DNA sequence data from the nuclear ribosomal internal transcribed spacer regions and plastid psbA–trnH intergenic spacer and microsatellite data were used to infer a phylogeny of the genus.

Key Results: Parsimony analysis of the combined sequence data and multivariate analysis based on fruit characters indicated that Sinojackia dolichocarpa is monophyletic and genetically well separated from the other Sinojackia species, thus supporting its rank at the generic level as Changiostyrax. Phylogenetic relationships within Sinojackia sensu stricto are unresolved from the combined sequence data. A UPGMA dendrogram based on seven microsatellite loci of 96 individual plants yielded a first-diverging cluster of all individuals of S. microcarpa. The remaining species form another cluster without any definitive patterns corresponding to current species circumscriptions, suggesting either extensive hybridization or incipient speciation.

Conclusions: The results suggest that there are too many species recognized within Sinojackia sensu stricto, but this must be further assessed with comprehensive morphological and taxonomic revisionary work. The implications of the phylogenetic data for conservation are discussed.

Key words: Changiostyrax, conservation, phylogeny, Sinojackia, Styracaceae


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