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Title: The systematics of the Hedychieae (Zingiberaceae), with emphasis on Roscoea Sm.
Author: Ngamriabsakul, Chatchai
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2001
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The tribe Hedychieae (ginger lily) is the second largest in the ginger family, Zingiberaceae. I carried out a phylogenetic analysis of the Hedychieae using nuclear ribosomal DNA (ITS1, 5.8S and ITS2) and chloroplast DNA (trnL (UAA) 5' exon to trnF (GAA)). The results of these two data sets are in accordance, though with differing levels of resolution. Hedychieae is confirmed to include Zingibereae, the true gingers, and is monophyletic. However, the genera Boesenbergia and Curcuma are apparently not monophyletic. Two major clades are recognised to Hedychieae namely, the 'Curcuma clade' and the 'Hedychium clade'. The 'Curcuma clade' comprises Camptandra, Pyrgophyllum, Stahlianthus and a set of four morphologically very similar genera: Curcuma, Hitchenia, Paracautleya and Smithatris. In this clade, a subclade of Camptandra/Pyrgophyllum is the sister group to a very strongly supported 'Curcuma complex': Curcuma, Hitchenia, Paracautleya, Smithatris and Stahlianthus. Smithatris may be recognised as a distinct genus and sister group to the others in the complex. Curcuma is paraphyletic. Two subclades are found in the complex namely, Stahlianthus/Curcuma subg. Hitcheniopsis, and Hitchenia/Paracautleya/Curcuma subg. Curcuma. The dorsifixed versatile anther of the Curcuma complex has been lost independently in Hitchenia and Stahlianthus, while the basifixed versatile anther has arisen independently in Camptandra and Cautleya/Roscoea. Scanning electron micrographs of anther development in Cautleya spicata show that the appendages develop from the joint connective tissue and thus the anther with the appendages is versatile in mature plant. Observation of the appendages in Curcuma and Paracautleya reveals that the anther is dorsifixed and the appendages are derived from the thecae of the anther.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available