Abstract
The relationship between Litsea and related genera is currently unclear. Previous molecular studies on these taxa using cpDNA and nrITS were unable to produce well-resolved phylogenetic trees. In this study, we explored the potential of the rpb2 gene as a source of molecular information to better resolve the phylogenetic analysis. Although rpb2 was believed to be a single-copy gene, our cloning results showed that most species examined possessed several copies of these sequences. However, the genetic distance among copies from any one species was low, and these copies always formed monophyletic groups in our molecular trees. Our phylogenetic analyses of rpb2 data resulted in better resolved tree topologies compared to those based on cpDNA or nrITS data. Our results show that monophyly of the genus Litsea is supported only for section Litsea. As a genus, Litsea was shown to be polyphyletic. The genera Actinodaphne and Neolitsea were resolved as monophyletic groups in all analyses. They were also shown to be sisters and closer to the genus Lindera than to the genus Litsea. Our results also revealed that the genus Lindera is not a monophyletic group.
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Acknowledgments
We would like to thank Dr. Irawati, Director of Bogor Botanic Garden; Mr. Holif Imanuddin, Director of Cibodas Botanic Garden; and Prof. Jin Murata, Director of Koishikawa Botanical Garden, Graduate School of Science, University of Tokyo, for allowing us to use materials from their plant collections. We would also like to thank Ms. Lucy Chong, Sarawak Forest Research Center, for permitting us to conduct fieldwork in Lambir National Park as well as to use the Sarawak Herbarium facilities. We would like to express our sincere thanks to the staff of Lambir National Park and the Sarawak Herbarium for their hospitality. We greatly appreciate the assistance of Dr. Shoko Sakai, Center for Ecological Research, Kyoto University and the late Dr. Kuniyasu Momose, Faculty of Agriculture, Ehime University, for accompanying us during our fieldwork in Malaysia. We would like to acknowledge Prof. Hiroshi Tobe, Dr. Kyoko Aoki, Dr. Hidetsugu Miwa, Dr. Akihiro Seo, Dr. Wataru Shinohara, Dr. Hirotoshi Sato and Mr. Keigo Mori for their generous support and technical assistance, and Mr. Takaya Iwasaki for providing plant materials from Japan.
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Fijridiyanto, I.A., Murakami, N. Phylogeny of Litsea and related genera (Laureae-Lauraceae) based on analysis of rpb2 gene sequences. J Plant Res 122, 283–298 (2009). https://doi.org/10.1007/s10265-009-0218-8
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DOI: https://doi.org/10.1007/s10265-009-0218-8