Systematics Section / ASPT
Tepe, Eric J. , Pelser, Pieter B. , Watson, Linda E. .
Molecular Clock Dating of the Major Divergences in Tribe Anthemideae (Asteraceae).
ANTHEMIDEAE - a tribe of chrysanthemums, daisies, sagebrushes and their relatives, is composed of over 100 genera and approximately 1750 species. It has a primary distribution in the northern hemisphere with centers of diversity in south central Asia, the Mediterranean region of Europe, Far East Asia, and South Africa. It contains several large genera including Artemisia, Anthemis, and Achillea that account for over half of the tribe's species, as well as many small and monotypic genera. Molecular phylogenies based on three plastid and nuclear markers place its geographic origin in southern Africa, along with African origins for sister tribes Astereae, Gnaphalieae, and Calenduleae. We utilized molecular clock methods using penalized likelihood for rate smoothing and three calibration points that included minimum (Artemisia-like pollen) and maximum (Canary Island endemics) constraints to infer the age for the tribe and its major clades. The molecular data support an age of approximately 27 my for the tribe, with a divergence into Asia around 24 mya, and a radiation into Eurasia and the Mediterranean about 14 mya.
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1 - Miami University, Department of Botany, Oxford, Ohio, 45056, USA
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM