Systematics Section / ASPT
Javadi, Firouzeh , Yamaguchi, Hirofumi .
A phylogenetic analysis and geographical diversification of the genus Cicer L. (Papilionoideae ) using plastid and nuclear DNA sequences.
CICER L. is one of the important genera in subfamily Papilionoideae because the economic value of C. arietinum as food crops. It comprises approximately 42 species of herbaceous or semi-shrubby annuals and perennials in temperate zones of Northern hemisphere. The genus displays its greatest diversity in West and Central Asia with extension to Mediterranean region (Middle East, East Europe, and isolated area in North Africa), yet its origin and geographical relationship is poorly understood. The present study uses sequences of nuclear rDNA ITS and plastid regions (trnK/matK and trnS-trnG) to understand the phylogenetic relationships discovered to elucidate the geographical diversification of the genus. Results from combined nuclear and plastid regions revealed four well-supported geographical groups: Middle Eastern, West-Central Asian, Aegean-Mediterranean, and African group. Phylogenetic evidence from clock-independent estimates of molecular divergence times indicate that the genus has Mediterranean origin with considerable diversification in the Miocene/Pliocene.Isolated African species in the extant region of the genus, suggesting past broader distribution of the genus than present.Geological and environmental changes are major factors for diversification of Cicer species.
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1 - Osaka Prefecture University, Graduate School of Life and Environmental Sciences, Sakai, Osaka, 599-8531, Japan
Presentation Type: Oral Paper:Papers for Sections
Date: Monday, July 31st, 2006
Time: 4:45 PM