Phylogeny, taxonomic affinities, and biogeography of <i>Penstemon</i> (Plantaginaceae) based on ITS and cpDNA sequence data

Wolfe, Andrea D.; Randle, Christopher P.; Datwyler, Shannon L.; Morawetz, Jeffery J.; Arguedas, Nidia; Dı́az, José A.

doi:10.3732/ajb.93.11.1699

Cited by 84 publications

(152 citation statements)

References 44 publications

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“…grinnellii produced high amounts of chloroplast non-Dasanthera species surveyed, P. grinnellii and P . centranthifolius are the closest relatives ( Wolfe et al, 2006 ), with a sequence variation level of ~5.7%. The average amount of sequence variation among all six species was 7.14%.…”

Section: Resultsmentioning

confidence: 99%

The Parasitic Plant Genome Project: New Tools for Understanding the Biology ofOrobancheandStriga

et al. 2012

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The Parasitic Plant Genome Project has sequenced transcripts from three parasitic species and a nonparasitic relative in the Orobanchaceae with the goal of understanding genetic changes associated with parasitism. The species studied span the trophic spectrum from free-living nonparasite to obligate holoparasite. Parasitic species used wereTriphysaria versicolor, a photosynthetically competent species that opportunistically parasitizes roots of neighboring plants;Striga hermonthica, a hemiparasite that has an obligate need for a host; andOrobanche aegyptiaca, a holoparasite with absolute nutritional dependence on a host.Lindenbergia philippensisrepresents the closest nonparasite sister group to the parasitic Orobanchaceae and was included for comparative purposes. Tissues for transcriptome sequencing from each plant were gathered to identify expressed genes for key life stages from seed conditioning through anthesis. Two of the species studied,S. hermonthicaandO. aegyptiaca, are economically important weeds and the data generated by this project are expected to aid in research and control of these species and their relatives. The sequences generated through this project will provide an abundant resource of molecular markers for understanding population dynamics, as well as provide insight into the biology of parasitism and advance progress toward understanding parasite virulence and host resistance mechanisms. In addition, the sequences provide important information on target sites for herbicide action or other novel control strategies such as trans-specific gene silencing.

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Section: Resultsmentioning

confidence: 99%

The Parasitic Plant Genome Project: New Tools for Understanding the Biology ofOrobancheandStriga

et al. 2012

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“…Our interpretation is also supported by the age of the oldest hummingbird-adapted group in North America, Lonicera (Caprifoliaceae), with a stem age of 9.2 MYA and a crown age of 7.0 MYA [81], the age of hummingbird-pollinated Psittacanthus mistletoes in Mexico with a stem age of 9.68 MYA and a crown age of 7.43 MYA [82, 83], and by the Pleistocene origin of Penstemon in the Rocky Mountains with subsequent migration and radiation to the Cascade–Sierra Nevada cordillera and then into southwestern North America and throughout eastern North America [84]. Interestingly, range expansions of bee hummingbirds in North America during the Pliocene seem to correspond to Pliocene divergences within the hummingbird-pollinated Psittacanthus mistletoes apparently linked to habitat shifts [82, 83].…”

Section: Discussionmentioning

confidence: 99%

The conquering of North America: dated phylogenetic and biogeographic inference of migratory behavior in bee hummingbirds

Licona-Vera

Ornelas

2017

BMC Evol Biol

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BackgroundGeographical and temporal patterns of diversification in bee hummingbirds (Mellisugini) were assessed with respect to the evolution of migration, critical for colonization of North America. We generated a dated multilocus phylogeny of the Mellisugini based on a dense sampling using Bayesian inference, maximum-likelihood and maximum parsimony methods, and reconstructed the ancestral states of distributional areas in a Bayesian framework and migratory behavior using maximum parsimony, maximum-likelihood and re-rooting methods.ResultsAll phylogenetic analyses confirmed monophyly of the Mellisugini and the inclusion of Atthis, Calothorax, Doricha, Eulidia, Mellisuga, Microstilbon, Myrmia, Tilmatura, and Thaumastura. Mellisugini consists of two clades: (1) South American species (including Tilmatura dupontii), and (2) species distributed in North and Central America and the Caribbean islands. The second clade consists of four subclades: Mexican (Calothorax, Doricha) and Caribbean (Archilochus, Calliphlox, Mellisuga) sheartails, Calypte, and Selasphorus (incl. Atthis). Coalescent-based dating places the origin of the Mellisugini in the mid-to-late Miocene, with crown ages of most subclades in the early Pliocene, and subsequent species splits in the Pleistocene. Bee hummingbirds reached western North America by the end of the Miocene and the ancestral mellisuginid (bee hummingbirds) was reconstructed as sedentary, with four independent gains of migratory behavior during the evolution of the Mellisugini.ConclusionsEarly colonization of North America and subsequent evolution of migration best explained biogeographic and diversification patterns within the Mellisugini. The repeated evolution of long-distance migration by different lineages was critical for the colonization of North America, contributing to the radiation of bee hummingbirds. Comparative phylogeography is needed to test whether the repeated evolution of migration resulted from northward expansion of southern sedentary populations.Electronic supplementary materialThe online version of this article (doi:10.1186/s12862-017-0980-5) contains supplementary material, which is available to authorized users.

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“…If true, this would explain the predominance of large effect QTLs involved in the evolution of increased nectar production in species pollinated by hummingbirds. This argument assumes that bird pollination is derived from insect pollination, as appears to be the case in Penstemon [6,7] and Mimulus [32]. However, bird pollination is considered derived in Ipomopsis [15], in which QTL effects on nectar volume are small.…”

Section: Discussion (A) Genetic Basis Of Pollination Syndrome Traitsmentioning

confidence: 99%

“…Penstemon neomexicanus (figure 1a) is a closely related species [6] that occurs in the Sacramento mountains of New Mexico. This species retains the ancestral bee pollination syndrome: blue-purple flowers that are shorter and wider, having lower petals that form a landing platform for bees, and producing small amounts of concentrated nectar.…”

Section: Materials and Methods (A) Study Systemmentioning

confidence: 99%

“…There are approximately 284 species in this group, the majority of which display the ancestral bee pollination syndrome. However, there have been an estimated 10-21 independent evolutionary transitions to the hummingbird pollination syndrome, with no cases of reversals [6,7]. These transitions are highly convergent and involve a shift from blue, purple or pink flowers to red flowers, an increase in nectar volume, a decrease in nectar sugar concentration, loss of a 'landing platform' formed by the lower petals, lengthening and narrowing of the corolla tube, and lengthening of the stamens and style yielding exsertion of the reproductive organs [8].…”

Section: Introductionmentioning

confidence: 99%

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Identification of major quantitative trait loci underlying floral pollination syndrome divergence in Penstemon

Wessinger

Hileman

Rausher

2014

Phil. Trans. R. Soc. B

101

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Distinct floral pollination syndromes have emerged multiple times during the diversification of flowering plants. For example, in western North America, a hummingbird pollination syndrome has evolved more than 100 times, generally from within insect-pollinated lineages. The hummingbird syndrome is characterized by a suite of floral traits that attracts and facilitates pollen movement by hummingbirds, while at the same time discourages bee visitation. These floral traits generally include large nectar volume, red flower colour, elongated and narrow corolla tubes and reproductive organs that are exerted from the corolla. A handful of studies have examined the genetic architecture of hummingbird pollination syndrome evolution. These studies find that mutations of relatively large effect often explain increased nectar volume and transition to red flower colour. In addition, they suggest that adaptive suites of floral traits may often exhibit a high degree of genetic linkage, which could facilitate their fixation during pollination syndrome evolution. Here, we explore these emerging generalities by investigating the genetic basis of floral pollination syndrome divergence between two related Penstemon species with different pollination syndromes—bee-pollinated P. neomexicanus and closely related hummingbird-pollinated P. barbatus . In an F 2 mapping population derived from a cross between these two species, we characterized the effect size of genetic loci underlying floral trait divergence associated with the transition to bird pollination, as well as correlation structure of floral trait variation. We find the effect sizes of quantitative trait loci for adaptive floral traits are in line with patterns observed in previous studies, and find strong evidence that suites of floral traits are genetically linked. This linkage may be due to genetic proximity or pleiotropic effects of single causative loci. Interestingly, our data suggest that the evolution of floral traits critical for hummingbird pollination was not constrained by negative pleiotropy at loci that show co-localization for multiple traits.

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Phylogeny, taxonomic affinities, and biogeography of Penstemon (Plantaginaceae) based on ITS and cpDNA sequence data

Cited by 84 publications

References 44 publications

The Parasitic Plant Genome Project: New Tools for Understanding the Biology ofOrobancheandStriga

The Parasitic Plant Genome Project: New Tools for Understanding the Biology ofOrobancheandStriga

The conquering of North America: dated phylogenetic and biogeographic inference of migratory behavior in bee hummingbirds

Identification of major quantitative trait loci underlying floral pollination syndrome divergence in Penstemon

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