Timetree of Rubiaceae - Phylogeny and dating the family, subfamilies and tribes

• Rubiaceae are one of the largest families of plants, with ;13,000 species. In this study, we have estimated the phylogeny for 534Rubiaceae taxa from329 generawith up to five different chloroplast regions by Bayesian analysis. It resulted in a highly resolved tree with many strongly supported nodes. There is strong support for the three subfamilies (Cinchonoideae, Ixoroideae, Rubioideae) and most of the 44 included tribes. A scaled-down data set of 173 Rubiaceae taxawas usedwith a Bayesian approach to estimate divergence times for clades classified as tribes and subfamilies. Four fossils were used as minimum age priors, one inside each subfamily and one for Rubiaceae as a whole (Faramea-type pollen, Scyphiphora pollen, Cephalanthus pusillus fruits, and Paleorubiaceophyllum eocenicum leaves). The estimated lineage (stem) divergence time for Rubiaceae is 90.4Ma. The estimated lineage divergence times for the subfamilies are 84.4 (86.6)Ma for Rubioideae, 73.1Ma for Ixoroideae, and 73.1Ma for Cinchonoideae.The estimated lineage divergence times for the tribes vary between 86.6 and 14.2Ma. Classification, relationships, geographical distribution, and age estimates are presented and discussed for all tribes.

Ämnesord

NATURVETENSKAP  -- Biologi -- Biologisk systematik (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Biological Systematics (hsv//eng)

Nyckelord

Rubiaceae

dating

divergence times

Bayesian inference

phylogeny

Systematics and phylogenetics

Systematik och fylogeni

systematisk botanik

Systematic Botany

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