Systematics Section / ASPT
Kajita, Tadashi , Wakita, Norihisa , Takayama, Koji , Yoichi, Tateishi .
Phylogeography of pantropical sea-drift seed dispersal plants, Ipomoea pes-caprae (L.) R. Br. (Convolvulaceae).
IPOMOEA pes-caprae, Beach Morning Glory, has extremely wide distribution area that spread over the littoral areas of tropics of the five continents. This intriguing distribution pattern is thought to be the results of long distance seed dispersal of their sea-drift seeds. We performed extensive field and molecular works 1) clarify how this unique distribution pattern has achieved, 2) to estimate the levels of migration among populations to maintain the unity of the species over the world, and 3) to reveal the speciation process through these specie. Comparing over 4kb of chloroplast DNA sequences among samples obtained over wide distribution areas showed almost no nucleotide substitutions. This result may suggest recent diversification of the species and rapid expansion to the pantropical areas. On the other hand, considerable amount of genetic variation was detected in an intron of nuclear DFR-B gene. A phylogenetic tree of DFR-B gene intron suggested samples obtained from Indian Ocean, many of which were recognized as different subspecies, made a separate clade. This result is also confirmed with AFLP analysis.
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1 - Chiba University, Department of Biology, Faculty Of Science, 1-33 Yayoi-Cho, Inage-Ku, Chiba, 263-8522, Japan
2 - Graduate School of Science and Technology, 1-33 Yayoi-Cho, Inage-Ku, Chiba, 263-8522, Japan
3 - University of the Ryukyus, Faculty of Education, 1 Senbaru, Nishihara, Okinawa, 903-0129, Japan
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM