Summary
Relationships among 23 species of Zingiber Mill. were investigated using nuclear ribosomal DNA (ITS1, 5.8S and ITS2) sequences. Phylogenetic analysis of the ITS region has resolved the taxa under study into four clades, which correspond with previously recognised sectional classification of the genus based on inflorescence type (sects Zingiber, Dymczewiczia (Horan.) Benth., Pleuranthesis Benth. and Cryptanthium Horan.). However, sects Zingiber and Dymczewiczia are weakly supported as separate groups and are more closely related to each other than to sects Pleuranthesis and Cryptanthium. Two species, Z. junceum Gagnep. and Z. gramineum Noronha, which were previously tentatively placed in both sects Zingiber and Dymczewiczia due to their ability to develop two inflorescence types, are allied with sect. Zingiber. The close relationship of the two sections based on ITS sequences together with similarity in pollen morphology supports an earlier proposal that sect. Dymczewiczia should be amalgamated with sect. Zingiber. Analysis of ITS sequence data also resolved the species under study into three groups according to geographical distribution.
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Acknowledgements
This work was supported by research funds from the Applied Taxonomic Research Center, Khon Kaen University, Thailand. The authors wish to thank Dr David Simpson of the Royal Botanic Gardens, Kew for helpful advice on phylogenetic analysis.
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Theerakulpisut, P., Triboun, P., Mahakham, W. et al. Phylogeny of the genus Zingiber (Zingiberaceae) based on nuclear ITS sequence data. Kew Bull 67, 389–395 (2012). https://doi.org/10.1007/s12225-012-9368-2
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DOI: https://doi.org/10.1007/s12225-012-9368-2