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Phylogeny of Flaveria (Asteraceae) and inference of C₄ photosynthesis evolution¹

²Department of Botany, University of Toronto, Toronto, Ontario, M5S1A1, Canada; ³Department of Natural History, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario, M5S 2C6, Canada

ABSTRACT

A well-resolved phylogeny of Flaveria is used to infer evolutionary relationships among species, biogeographical distributions, and C₄ photosynthetic evolution. Data on morphology, life history, and DNA sequences (chloroplastic trnL-F, nuclear ITS and ETS) for 21 of 23 known species were collected. Each data set was analyzed separately and in combination using maximum parsimony and Bayesian analyses. The phylogeny of Flaveria is based on the combined analysis of all data. Our phylogenetic evidence indicates that C₃ Flaveria are all basal to intermediate (C₃-C₄ and C₄-like) and fully expressed C₄ Flaveria species. Two strongly supported clades (A and B) are present. Using this phylogeny, we evaluate the current systematics of the genus and suggest the removal and reevaluation of certain taxa. We also infer the center of origin and dispersal of Flaveria species. Multiple origins of photosynthetic pathway intermediacy in Flaveria are recognized. C₃-C₄ intermediacy has evolved twice in the genus and is found to be evolutionarily intermediate in clade A, but not necessarily in clade B. C₄-like photosynthesis is also derived once in each clade. In addition, fully expressed C₄ photosynthesis may have evolved up to three times within clade A.

Key Words: Asteraceae • C₃-C₄ intermediates • C₄ photosynthesis • ETS • Flaveria • ITS • phylogeny • trnL-F

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