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Systematics Section / ASPT

Beck, John [1], Small, Randall [1].

Phylogenetic history of Sida and related genera (Malvaceae) based on chloroplast and nuclear DNA sequences.

The genus Sida (Malvaceae, tribe Malveae) is a species-rich group with a global distribution. Generic circumscription of Sida has historically been problematic, and a number of segregate genera have been proposed to accommodate species originally placed in a large and heterogeneous Sida s.l. Sida s.s. is currently divided into eleven sections based on morphological data, and along with the segregate genera, comprise an informal group known as the Sida alliance. A recent phylogenetic analysis of the Sida alliance based on nuclear ribosomal ITS sequences recovered a group of Sida species (including the segregate genus Dendrosida) that represent the Sida Core. This analysis also suggested that Sida is polyphyletic and a number of species currently classified in Sida are actually more closely related to other genera than to the Core. To complement and extend the phylogenetic analysis based on ITS sequences we have sequenced two chloroplast DNA regions (the rpL16 intron and the 3' trnK-matK intron + portion of the 3' matK coding region) for species currently classified in Sida and segregate genera. Nuclear GBSSI sequences were also generated for Sida species that fall within the Core. The goal of the study is to assess the monophyly of the named sections of Sida, the relationships between Sida and related genera, and the limits of the Core using chloroplast sequences. Additionally, GBSSI sequences are used to recover relationships between and within individual groups of Sida species within the Core.

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1 - University of Tennessee, Department of Ecology and Evolutionary Biology, 437 Hesler Biology Building, 1406 Circle Drive, Knoxville, Tennessee, 37996-1100, USA


Presentation Type: Oral Paper
Session: 39-7
Location: 404/Hilton
Date: Tuesday, August 16th, 2005
Time: 4:15 PM
Abstract ID:372

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