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 (<i>trn</i>L (UAA) 5' exon to <i>trn</i>F (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 <i>Boesenbergia </i>and <i>Curcuma </i>are apparently not monophyletic. Two major clades are recognised to Hedychieae namely, the '<i>Curcuma </i>clade' and the '<i>Hedychium</i> clade'. The '<i>Curcuma</i> clade' comprises <i>Camptandra, Pyrgophyllum, Stahlianthus </i>and a set of four morphologically very similar genera: <i>Curcuma, Hitchenia, Paracautleya </i>and <i>Smithatris</i>. In this clade, a subclade of <i>Camptandra/Pyrgophyllum</i> is the sister group to a very strongly supported '<i>Curcuma </i>complex': <i>Curcuma, Hitchenia, Paracautleya, Smithatris</i> and <i>Stahlianthus. Smithatris</i> may be recognised as a distinct genus and sister group to the others in the complex. <i>Curcuma</i> is paraphyletic. Two subclades are found in the complex namely, <i>Stahlianthus/Curcuma </i>subg. <i>Hitcheniopsis,</i> and <i>Hitchenia/Paracautleya/Curcuma </i>subg. <i>Curcuma. </i>The dorsifixed versatile anther of the <i>Curcuma </i>complex has been lost independently in <i>Hitchenia</i> and <i>Stahlianthus</i>, while the basifixed versatile anther has arisen independently in <i>Camptandra</i> and <i>Cautleya/Roscoea. </i>Scanning electron micrographs of anther development in <i>Cautleya spicata </i>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 <i>Curcuma </i>and <i>Paracautleya</i> reveals that the anther is dorsifixed and the appendages are derived from the thecae of the anther.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:659963 |
| Date | January 2001 |
| Creators | Ngamriabsakul, Chatchai |
| Publisher | University of Edinburgh |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/1842/15514 |
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