Pollinator divergence and pollination isolation between hybrids with different floral color and morphology in two sympatric Penstemon species

Cardona, Juliana; Lara, Carlos; Ornelas, Juan Francisco

doi:10.1038/s41598-020-64964-8

Cited by 16 publications

(6 citation statements)

References 85 publications

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“…However, the role of introgression as a diversifying mechanism in Penstemon has most often been discussed in the context of pollen‐mediated gene flow, particularly between hymenopteran‐ and hummingbird‐pollinated species. There are several hypotheses involving hybridization between hymenopteran‐ and hummingbird‐pollinated species that have subsequently been supported with molecular evidence (e.g., Straw, 1955, 1956a, 1956b; Crosswhite, 1967; Wolfe et al, 1998a, 1998b; Crump et al, 2020), and much research has been done on the genetic basis of transitions to hummingbird pollination (e.g., Wessinger and Rausher, 2014; Wessinger et al, 2014) and the differentiation of pollination traits in Penstemon (e.g., Wilson and Jordan, 2009; Katzer et al, 2019; Cardona et al, 2020). In this light, assessing the role of hybridization as a diversification mechanism in the absence of hummingbird pollination may help illuminate other processes that are integral to understanding speciation in Penstemon .…”

Section: Figurementioning

confidence: 99%

Testing hypotheses of hybrid taxon formation in the shrubby beardtongues (PenstemonsubgenusDasanthera)

Stone

Rodríguez-Peña

Wolfe

2022

American J of Botany

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Premise: Hybridization is increasingly being identified in the genomes of species across the tree of life, leading to a general recognition that hybridization plays an important role in the generation of species diversity. While hybridization may increase species diversity directly via the formation of new taxa through hybrid speciation, it may also act indirectly via the exchange of phenotypic and genetic variance between species, which may in turn stimulate future speciation events. Methods: Using high-throughput sequence data, we resolved phylogenetic relationships and investigated the role of hybridization as a diversification mechanism in the shrubby beardtongues (Penstemon subgenus Dasanthera), a group of North American wildflowers that has undergone a recent and rapid adaptive radiation. Specifically, we tested four hypotheses of hybrid taxon formation resulting from hybridization between P. davidsonii and P. fruticosus. Results: Species tree inference supports the monophyly of subgenus Dasanthera and elucidates relationships between taxa distributed in the Cascades and Sierra Nevada Mountains. Results also provide evidence of gene flow between P. davidsonii and P. fruticosus and support at least one hybrid origin hypothesis (P. davidsonii var. menziesii) in a region of contemporary distributional overlap. Hybridization may have also been facilitated by historical overlap in geographic distribution caused by species' responses to climatic changes during the Pleistocene. Conclusions: Our results support a history of hybridization between focal taxa in a rapidly radiating clade of plants and more broadly contribute to our growing understanding of the role of hybridization as a diversification mechanism in plants.

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Section: Figurementioning

confidence: 99%

Testing hypotheses of hybrid taxon formation in the shrubby beardtongues (PenstemonsubgenusDasanthera)

Stone

Rodríguez-Peña

Wolfe

2022

American J of Botany

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“…is often believed to be the basis of selection for pollinators [ 7 , 8 ]. Plants employ floral color [ 9 , 10 ], floral scent [ 11 , 12 , 13 ], or floral shape [ 14 , 15 , 16 ] to attract pollinators. Thus, studies on pollination signals are very important for understanding plant–pollinator interactions.…”

Section: Introductionmentioning

confidence: 99%

Functional Differentiation of Floral Color and Scent in Gall Midge Pollination: A Study of a Schisandraceae Plant

Gan

Wang

2022

Plants

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Gall midges are among the most host-specific insects. Their interactions with plants likely date back to the Cretaceous period. Plants from at least seven families are involved in gall midge pollination; however, little is known about the pollination signals of gall midges. In this study, we used a Resseliella–Schisandra model to investigate the roles of floral scent and color in attracting gall midges. Field observations, behavioral bioassays via Y-tubes, and “flight box” experiments were performed. The results demonstrated that gall midges may be attracted by both floral scent and color and that two flower signals are more effective in promoting insect flower-landing than either alone. In the field, gall midges visited male flowers effectively at night but almost always visited female flowers during the day. Thus, during the Resseliella–Schisandra interactions, female flowers predominantly employed visual cues over scent to attract midges during the day; in contrast, olfactory cues were more functional for male flowers to export pollen in the dark. In this study, we first identified the roles of floral color and the functional differentiation of visual and olfactory cues during gall midge pollination.

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“…Flower color is an essential character of plants. Bright flower color is favorable to attract pollinators [ 42 , 43 ], which is of great significance to the reproduction of insect-pollinated plants. Bright flower color is also a vital ornamental character.…”

Section: Discussionmentioning

confidence: 99%

Important Roles of Key Genes and Transcription Factors in Flower Color Differences of Nicotiana alata

Zheng

Chen

Liu

et al. 2021

Genes

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Nicotiana alata is an ornamental horticultural plant with a variety of flower colors and a long flowering period. The genes in four different colored N. alata (white, purple, red, and lemon green) were analyzed to explain the differences in flower color using transcriptomes. A total of 32 differential expression genes in the chlorophyll biosynthesis pathway and 41 in the anthocyanin biosynthesis pathway were identified. The enrichment analysis showed that the chlorophyll biosynthesis pathway and anthocyanin biosynthesis pathway play critical roles in the color differences of N. alata. The HEMA of the chlorophyll biosynthesis pathway was up-regulated in lemon green flowers. Compared with white flowers, in the red and purple flowers, F3H, F3′5′H and DFR were significantly up-regulated, while FLS was significantly down-regulated. Seventeen differential expression genes homologous to transcription factor coding genes were obtained, and the homologues of HY5, MYB12, AN1 and AN4 were also involved in flower color differences. The discovery of these candidate genes related to flower color differences is significant for further research on the flower colors formation mechanism and color improvements of N. alata.

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Pollinator divergence and pollination isolation between hybrids with different floral color and morphology in two sympatric Penstemon species

Abstract: medium waves (M) in hummingbirds (Fig. 2E) and medium-to-short waves (M and S) in bumblebees (Fig. 2F). We also found that the angle of the visual signal differed in each group (X:

Cited by 16 publications

References 85 publications

Testing hypotheses of hybrid taxon formation in the shrubby beardtongues (PenstemonsubgenusDasanthera)

Testing hypotheses of hybrid taxon formation in the shrubby beardtongues (PenstemonsubgenusDasanthera)

Functional Differentiation of Floral Color and Scent in Gall Midge Pollination: A Study of a Schisandraceae Plant

Important Roles of Key Genes and Transcription Factors in Flower Color Differences of Nicotiana alata

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