Non-pollinator selection for a floral homeotic mutant conferring loss of nectar reward in Aquilegia coerulea

Cabin, Zachary; Derieg, Nathan J.; Garton, Alexandra; Ngo, Timothy; Quezada, Ashley; Gasseholm, Constantine; Simon, Mark; Hodges, Scott A.

doi:10.1016/j.cub.2022.01.066

Cited by 15 publications

(12 citation statements)

References 77 publications

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“…volatiles) are involved in pollinator attraction in Swartzia (Basso-Alves et al, 2022). Finally, petal loss may be under positive selection due to reduced herbivory and increased resource allocation (Cabin et al, 2022).…”

Section: Pre-adaptive and Adaptive Mechanisms In Shaping Trait Evolut...mentioning

confidence: 99%

Pre‐adaptation and adaptation shape trait‐environment matching in the Neotropics

Velásquez-Puentes

Torke

Barratt

et al. 2023

Global Ecol Biogeogr

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AimFunctional traits shape the distribution of taxa across environments. However, it remains unclear whether trait and environmental niche evolution are correlated, and what happened first: trait change facilitating environment shifts (pre‐adaptation) or environmental change leading to trait change (adaptation). We focus on a species‐rich Neotropical legume radiation to shed light on this enigma.LocationNeotropics.Time PeriodCenozoic.Major Taxa StudiedFabaceae: Papilionoidae: Swartzia.MethodsWe assembled leaflet, fruit and petal size data from monographs and herbarium collections for 86 to 96% of the c. 180 Swartzia species, inferred a dated Swartzia phylogenetic tree from existing DNA sequences covering 38% of the species and integrated these with distribution, soil and climate data. We used phylogenetic linear regression to quantify trait–environment relationships and applied comparative methods to evaluate modes of correlated evolution between traits and environments.ResultsLeaflet and petal size were strongly linked to climate, while fruit size was not associated with climate or soil characteristics. Evolutionary transitions to relatively low rainfall and low temperature environments were conditional on the evolution of small leaflets, whereas transitions to wet and warm environments were preceded by the evolution of larger leaflets. In contrast, transitions to the warmest or coldest environments were followed, rather than preceded, by petal loss.Main ConclusionOur results show that the macroevolution of functional traits has influenced the broad‐scale distribution of Swartzia across Neotropical rainforest, seasonally dry, montane and inundated habitats. We suggest that trait evolution is conditional on environmental change but both pre‐adaptive and adaptive processes may occur. These processes are important to understand the distribution of diversity at both regional (e.g. Amazonia) and global biogeographical scales.

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Section: Pre-adaptive and Adaptive Mechanisms In Shaping Trait Evolut...mentioning

confidence: 99%

Pre‐adaptation and adaptation shape trait‐environment matching in the Neotropics

Velásquez-Puentes

Torke

Barratt

et al. 2023

Global Ecol Biogeogr

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“…Traits of primary model species (Kramer, 2009;Puzey and Kramer, 2009;Kramer and Hodges, 2010;Fior et al, 2013;Thairu and Brunet, 2015;Filiault et al, 2018;Jiang et al, 2020;Min and Kramer, 2020;Cabin et al, 2022)…”

Section: Genus-level Attributesmentioning

confidence: 99%

The Boechera model system for evolutionary ecology

Rushworth

Wagner

Mitchell‐Olds

et al. 2022

American J of Botany

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Model systems in biology expand the research capacity of individuals and the community. Closely related to Arabidopsis, the genus Boechera has emerged as an important ecological model owing to the ability to integrate across molecular, functional, and eco‐evolutionary approaches. Boechera species are broadly distributed in relatively undisturbed habitats predominantly in western North America and provide one of the few experimental systems for identification of ecologically important genes through genome‐wide association studies and investigations of selection with plants in their native habitats. The ecologically, evolutionarily, and agriculturally important trait of apomixis (asexual reproduction via seeds) is common in the genus, and field experiments suggest that abiotic and biotic environments shape the evolution of sex. To date, population genetic studies have focused on the widespread species B. stricta, detailing population divergence and demographic history. Molecular and ecological studies show that balancing selection maintains genetic variation in ~10% of the genome, and ecological trade‐offs contribute to complex trait variation for herbivore resistance, flowering phenology, and drought tolerance. Microbiome analyses have shown that host genotypes influence leaf and root microbiome composition, and the soil microbiome influences flowering phenology and natural selection. Furthermore, Boechera offers numerous opportunities for investigating biological responses to global change. In B. stricta, climate change has induced a shift of >2 weeks in the timing of first flowering since the 1970s, altered patterns of natural selection, generated maladaptation in previously locally‐adapted populations, and disrupted life history trade‐offs. Here we review resources and results for this eco‐evolutionary model system and discuss future research directions.

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“…Bird pollination may increase reproductive success as compared to bee pollination ( Abrahamczyk et al, 2022 ), with bird pollination possibly leading to an increase in the rate of outcrossing ( Whelan et al, 2009 ) and thus increased LD decay. Given that positive selection on certain traits can also result in elevated LD, as observed in a floral homeotic mutant of Aquilegia L. (Ranunculaceae; Cabin et al, 2022 ), measures of LD across closely related species can indicate genomic-scale selection in action.…”

Section: Introductionmentioning

confidence: 99%

The genetic mechanisms underlying the convergent evolution of pollination syndromes in the Neotropical radiation of Costus L.

Valderrama

Landis

Skinner³

et al. 2022

Front. Plant Sci.

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Selection together with variation in floral traits can act to mold floral form, often driven by a plant’s predominant or most effective pollinators. To investigate the evolution of traits associated with pollination, we developed a phylogenetic framework for evaluating tempo and mode of pollination shifts across the genus Costus L., known for its evolutionary toggle between traits related to bee and bird pollination. Using a target enrichment approach, we obtained 957 loci for 171 accessions to expand the phylogenetic sampling of Neotropical Costus. In addition, we performed whole genome resequencing for a subset of 20 closely related species with contrasting pollination syndromes. For each of these 20 genomes, a high-quality assembled transcriptome was used as reference for consensus calling of candidate loci hypothesized to be associated with pollination-related traits of interest. To test for the role these candidate genes may play in evolutionary shifts in pollinators, signatures of selection were estimated as dN/dS across the identified candidate loci. We obtained a well-resolved phylogeny for Neotropical Costus despite conflict among gene trees that provide evidence of incomplete lineage sorting and/or reticulation. The overall topology and the network of genome-wide single nucleotide polymorphisms (SNPs) indicate that multiple shifts in pollination strategy have occurred across Costus, while also suggesting the presence of previously undetected signatures of hybridization between distantly related taxa. Traits related to pollination syndromes are strongly correlated and have been gained and lost in concert several times throughout the evolution of the genus. The presence of bract appendages is correlated with two traits associated with defenses against herbivory. Although labellum shape is strongly correlated with overall pollination syndrome, we found no significant impact of labellum shape on diversification rates. Evidence suggests an interplay of pollination success with other selective pressures shaping the evolution of the Costus inflorescence. Although most of the loci used for phylogenetic inference appear to be under purifying selection, many candidate genes associated with functional traits show evidence of being under positive selection. Together these results indicate an interplay of phylogenetic history with adaptive evolution leading to the diversification of pollination-associated traits in Neotropical Costus.

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Non-pollinator selection for a floral homeotic mutant conferring loss of nectar reward in Aquilegia coerulea

Cited by 15 publications

References 77 publications

Pre‐adaptation and adaptation shape trait‐environment matching in the Neotropics

Pre‐adaptation and adaptation shape trait‐environment matching in the Neotropics

The Boechera model system for evolutionary ecology

The genetic mechanisms underlying the convergent evolution of pollination syndromes in the Neotropical radiation of Costus L.

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