Showing papers by "Lynn Bohs published in 2013"
TL;DR: The authors' large time-calibrated phylogeny provides a significant step towards completing a fully sampled species-level phylogeny for Solanaceae, and provides age estimates for the whole family, and is one of the best sampled angiosperm family phylogenies both in terms of taxon sampling and resolution published thus far.
Abstract: The Solanaceae is a plant family of great economic importance. Despite a wealth of phylogenetic work on individual clades and a deep knowledge of particular cultivated species such as tomato and potato, a robust evolutionary framework with a dated molecular phylogeny for the family is still lacking. Here we investigate molecular divergence times for Solanaceae using a densely-sampled species-level phylogeny. We also review the fossil record of the family to derive robust calibration points, and estimate a chronogram using an uncorrelated relaxed molecular clock. Our densely-sampled phylogeny shows strong support for all previously identified clades of Solanaceae and strongly supported relationships between the major clades, particularly within Solanum. The Tomato clade is shown to be sister to section Petota, and the Regmandra clade is the first branching member of the Potato clade. The minimum age estimates for major splits within the family provided here correspond well with results from previous studies, indicating splits between tomato & potato around 8 Million years ago (Ma) with a 95% highest posterior density (HPD) 7–10 Ma, Solanum & Capsicum c. 19 Ma (95% HPD 17–21), and Solanum & Nicotiana c. 24 Ma (95% HPD 23–26). Our large time-calibrated phylogeny provides a significant step towards completing a fully sampled species-level phylogeny for Solanaceae, and provides age estimates for the whole family. The chronogram now includes 40% of known species and all but two monotypic genera, and is one of the best sampled angiosperm family phylogenies both in terms of taxon sampling and resolution published thus far. The increased resolution in the chronogram combined with the large increase in species sampling will provide much needed data for the examination of many biological questions using Solanaceae as a model system.
421 citations
TL;DR: The first phylogenetic reconstruction of African and Madagascan species of Solanum subgenus Leptostemonum is presented, with 62 of 76 species native to these areas, plus an additional seven species of largely Asian distribution, using internal transcribed spacer (ITS), waxy and trnT-F regions.
89 citations
TL;DR: Solanum section Gonatotrichum is closely related to section Brevantherum, from which it differs by the presence of explosive fruit dehiscence and simple hairs in all taxa except S. lignescens, which has stellate pubescence.
Abstract: Solanum section Gonatotrichum (Solanaceae) includes eight species native to North, Central, and South America. Plants of this section are herbs to woody shrubs that lack spines, are pubescent with simple or stellate hairs, and have berries that swell due to increased turgor pressure and explosively dehisce to disperse the seeds. Section Gonatotrichum is closely related to section Brevantherum, from which it differs by the presence of explosive fruit dehiscence and simple hairs in all taxa except S. lignescens, which has stellate pubescence. The morphology, taxonomic history, nomenclature, ecology, distribution, and reproductive biology of Solanum section Gonatotrichum are reviewed. A dichotomous key is provided for the species of the section.
17 citations
Journal Article•
TL;DR: Two new species of Solanum (Solanaceae) from eastern Brazil are described, one of which is endemic to Espírito Santo state and is most similar to S. megalochiton, but has a more robust habit and a unique branching pattern of the flowering stems.
Abstract: Two new species of Solanum (Solanaceae) from eastern Brazil are described. Solanum anisocladum Giacomin & Stehmann is similar to S. megalochiton Mart., but differs by the indument of the adaxial leaf surface, which is composed of long porrect-stellate and unbranched trichomes. It also has a more robust habit and a unique branching pattern of the flowering stems. It is restricted to the Atlantic Rainforest of northeastern Brazil and was previously misidentified as S. megalochiton. The other species, Solanum caelicolum Giacomin & Stehmann, is endemic to Espírito Santo state and is most similar to S. hirtellum (Spreng.) Hassl., but differs mainly by its adaxial leaf indument, with porrect-stellate trichomes with a central ray smaller than the lateral ones, by its comparatively larger fruiting calyx that can reach up to three times the diameter of the mature berry and by its sessile to subsessile unbranched congested inflorescence. Both species belong to the Brevantherum clade, one of the main lineages identified in the genus Solanum, and are placed together in a clade which contains species from S. sects. Extensum D’Arcy and Stellatigeminatum Child. Complete descriptions, distributions, and preliminary conservation assessments of the new species are given.
6 citations