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Title: A study of the infrageneric classification of Alpinia roxb. (Zingiberaceae) using molecular data
Author: Rangsiruji, Achariya
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1999
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Fifty seven species of Alpinia and its outgroup were sampled and the internal transcribed spacer (ITS) region of nuclear ribosomal DNA was sequenced. Based on my ITS analyses I discovered three most important clades. First, ITS results (BS = 100% DI> +2) clearly supported Smith's (1991) classification of Pleuranthodium as a distinct genus which can be completely removed from Alpinia. Second, a clade, consisting of A. galanga, A. nigra and A. conchigera (BS = 100%, DI > +2) indicates a close relationship among these species. However, according to Smith (1990) A. galanga is placed with other species in section Alpinia subsection Alpinia (with non-tubular bracteoles). The position of A. galanga in section Allughas was confirmed by results of a phylogenetic analysis of the spacer between trnL (UAA) 3' exon and trnF (GAA) of chloroplast DNA (BS = 65%, EI = +1). Therefore, it appears that A. galanga has evolved within section Allughas and the absence of tubular bracteoles is a convergence with section Alpinia. Third, ITS data revealed a clade (BS = 100%, DI > +2) which includes species from both Smith's (1990) subgenera Alpinia and Dieramalpinia. The result was supported by that of the chloroplast spacer (BS = 100%, DI = +1). In addition, it was found that Alpinia is non-monophyletic as the basal group of subgenus Alpinia section Fax of Smith (1990) has two African Renealmia species as a sister group. The mapping of morphological characters onto the ITS strict consensus tree revealed congruence between these two types of data. General patterns of evolution within Alpinia are discussed in relation to biography.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available