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Citation for Study 1553

About Citation title: "Phylogenetics of the florally-diverse Andean clade Iochrominae (Solanaceae)".
About This study was previously identified under the legacy study ID S1498 (Status: Published).


Smith S., & Baum D. 2006. Phylogenetics of the florally-diverse Andean clade Iochrominae (Solanaceae). American Journal of Botany, null.


  • Smith S.
  • Baum D.


Recent molecular phylogenetic studies of Solanaceae have identified many well-supported clades within the family, and have permitted the creation of a phylogenetic system of classification. Here we estimate the phylogeny for Iochrominae, a clade of Physaleae sensu Olmstead et al. (1999), which contains 34 Andean species encompassing an immense diversity of floral forms and colors. Using three nuclear regions, ITS, the second intron of LEAFY and exons 2 to 9 of the granule-bound starch synthase gene (waxy), we evaluate the monophyly of the traditional genera comprising Iochrominae, and we assess the extent of interspecific hybridization within the clade. Our results showed only one of the six traditionally recognized genera of Iochrominae to be monophyletic. Further, comparison of the individual nuclear datasets revealed two interspecific hybrid taxa and a third possible case. We note that these hybrid taxa occur in the Amotape-Huancabamba zone, a region between the Northern and Central Andes that has the greatest diversity of Iochroma species and offers frequent opportunities for hybridization in areas of sympatry. We postulate that periodic hybridization events, such as those documented in our study, coupled with pollinator-mediated selection and the potential for microallopatry in montane Andean habitats may have promoted the diversification of floral form and color observed in Iochrominae.

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