Systematics/Phytogeography / Taxonomie/ Section
Vatanparast, Mohammad , Takayama, Koji , Minagawa, Naomi , Tateishi, Yoichi , Kajita, Tadashi .
Phylogeography of a pantropical plant with sea-drifted seeds, Canavalia rosea (Fabaceae), based on cpDNA.
Canavalia rosea (Sw.) DC. is a typical member of "Pantropical plants with sea-drifted seeds" that distribute in littoral areas of tropics and sub-tropics all over the world. A previous molecular phylogenetic study on the genus Canavalia using ITS sequences of nrDNA suggested that all the Hawaiian endemic species of subgenus Maunaloa, as well as, some other species (C. cathartica, C. lineata, and C. sericea) with sea-drifted seeds were included in the same clade with samples of C. rosea collected from various localities. The result of the previous study suggested that the Hawaiian endemic species might be originated from species that reached to Hawaii by sea-dispersal, however, the speciation process was still in question as clear phylogenetic relationships among species were not shown. In this study, we determined nucleotide sequences of three regions of chloroplast DNA (atpB-rbcL, ndhD-E and rps16) for samples obtained from 38 populations of C. rosea, and its allied species as well in worldwide. A total of 17 haplotypes were obtained and phylogenetic analyses suggested monophyly of all these species, which is basically consistent with the previous study. Three haplotypes were shared between C. rosea and some species, which imply complex history of speciation. One of the haplotypes was shared between New World samples of C. rosea and a Hawaiian species of subgenus Maunaloa, which may suggest the New World origin of the ancestor of Hawaiian species. Another haplotype was distributed all over the distribution range, which would suggest extremely long distance seed dispersal by sea-drifted seeds.
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1 - Chiba University, Department of Biology, Graduate School of Sciences, 1-33 Yayoi-Cho, Chiba, 263-8522, Japan
2 - Chiba University, Department of Biology, Faculty of Science, 1-33 Yayoi-Cho, Chiba, 263-8522, Japan
3 - University of the Ryukyus, Faculty of Education, 1 Senbaru, Okinawa, 903-0129, Japan
long distance dispersal
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM