@ARTICLE{TreeBASE2Ref20389, author = {Boris O Schlumpberger and Susanne S Renner}, title = {The relative roles of polyploidy, pollinator switches, and plant architecture in the evolution of Echinopsis, one of the largest genera of Cactaceae.}, year = {2012}, keywords = {Chromosome counts, pollination modes, polyploidy, growth form evolution, Trichocereeae}, doi = {}, url = {http://}, pmid = {}, journal = {American Journal of Botany}, volume = {99}, number = {8}, pages = {1335--1349}, abstract = {Premise of the study: In its current broad circumscription, Echinopsis with 100-150 species, many once placed in Lobivia or Trichocereus, is one of the largest genera of Cactaceae. To infer natural species groups in this alliance we here provide a plastid phylogeny and we then use the phylogenetic framework to address the roles of polyploidy, growth form changes, and changes in flower traits related to pollination mode. Methods: We sequenced 3800 nucleotides of chloroplast DNA from 162 plants representing 144 species and subspecies. The sample includes the type species of all genera close to, or included in, Echinopsis as well as a dense sample of other genera of the Trichocereeae and further outgroups. New and published chromosome counts were compiled and mapped on the phylogeny, as were pollination modes and growth habits. Key results: A maximum likelihood phylogeny confirms that Echinopsis s.l. is not monophyletic nor are any of the previously recognized genera (that have more than one species). Pollination mode and, to a lower extent, growth habit are evolutionarily labile, and diploidy is the rule in Echinopsis s.l., with the few polyploids clustered in just a few clades. Conclusions: Polyploidy plays a limited role in the diversification of the Echinopsis alliance. Taxonomic realignments are required but should wait for original studies of less evolutionary labile traits (possibly seed anatomy in combination with growth habit) suitable for circumscribing genera.} }

• Go to search
• Citation
• Taxa
• Matrices
• Trees
• Analyses
• 

CiteULike

Delicious

Connotea