| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2003: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Research Abstract |
Opinions about the delimitation and classification of the subfamily Sedoideae are still highly divergent, and thus the generic and infrageneric classification becomes one of urgent systematic problems in Crassulaceae. Various classifications of the subfamily have been proposed and there are two opposing viewpoints. One view retains Sedum as a catchall taxon and recognizes only a few additional genera under the Sedoideae, and the other segregates some groups as genera (e.g., Rhodiola, Hylotelephium, Phedimus) from Sedum on the basis of unique sets of morphological characters and recognizes a number of genera under the subfamily. It is necessary to resolve these conflicting viewpoints by testing the monophyletic status of genera separated from Sedum and clarifying their phylogenetic relationships to Sedum (s. str.). About 300 species of Sedoideae are distributed in the eastern Asian region (Ohba 1978) and most genera segregated from Sedum are restricted in eastern Asia. This region can t
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herefore be regarded as both a center of generic and infrageneric diversification and a center of distribution for the Sedoideae.
I estimated the phylogeny of the Sedoideae on a broad scale across eastern Asia using sequence variation of the cpDNA trnL-trnF spacer and the Internal Transcribed Spacer regions of the nuclear ribosomal repeats to clarify the phylogenetic positions of Asian Sedoideae. Our results agreed with most of the former studies, except for the Telephium clade. All eastern Asian genera except Sedum(s. str.) were in groups corresponding to the Telephium clade and the clade was determined to be polyphyletic with four strongly supported subclades, Rhodiola, Hylotelephium, Phedimus, and Umbilicus. All eastern Asian genera segregated from Sedwnare separated in a lineage distinct from Sedum (s. str.). Hylotelephium, Orostachys, Meterostachys, and Sinocrassula are closely related. Hylotelephium is polyphyletic, as is also Orostachys. In this lecture our preliminary study on Kungia will be introduced. Less
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