@ARTICLE{TreeBASE2Ref24206, author = {Brandon T. Sinn and Lawrence Kelly and John V. Freudenstein}, title = {Putative floral brood-site mimicry, loss of autonomous selfing, and reduced vegetative growth are significantly correlated with increased diversification in Asarum (Aristolochiaceae).}, year = {2015}, keywords = {Asarum, Binary-state speciation and extinction, Brood-site mimicry, Diversification, Magnoliid, Piperales}, doi = {10.1016/j.ympev.2015.04.019}, url = {http://}, pmid = {}, journal = {Molecular Phylogenetics and Evolution}, volume = {}, number = {}, pages = {}, abstract = {Abstract The drivers of angiosperm diversity have long been sought, and the flower-arthropod association has often been invoked as the most powerful driver of the angiosperm radiation. We now know that features that influence arthropod interactions can not only affect the diversification of lineages, but also expedite or constrain their rate of extinction, which can equally influence the observed asymmetric richness of extant angiosperm lineages. The genus Asarum (Aristolochiaceae; ~100 species) is widely distributed in north temperate forests, with substantial vegetative and floral divergence between and within its three major clades, Euasarum, Geotaenium, and Heterotropa. These species have long creeping or clumped rhizomes, one or two leaves per node, calyces of three sepals either separate or united into a calyx tube, and stamens and stigmatic surfaces that are either adjacent or spatially separated, the latter of which requires a pollen vector (herkogamy). We used Binary-State Speciation and Extinction Model (BiSSE) Net Diversification tests of character state distributions on a Maximum Likelihood phylogram and a Coalescent Bayesian species tree, inferred from seven chloroplast markers and nuclear rDNA, to test for signal of asymmetric diversification, character state transition, and extinction rates of floral and vegetative characters of interest. We found that reduction in vegetative growth, loss of autonomous self-pollination, and the presence of putative fungal-mimicking floral structures are significantly correlated with increased diversification in Asarum. No significant difference in model likelihood was identified between symmetric and asymmetric rates of character state transitions or extinction. We conclude that the flowers of the Heterotropa clade may have converged on some aspects of basidiomycete sporocarp morphology and that brood-site mimicry, coupled with a reduction in vegetative growth and the loss of autonomous self-pollination, may have driven diversification within Asarum. } }

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

CiteULike

Delicious

Connotea