Direct vs. indirect effects of whole‐genome duplication on prezygotic isolation in<i>Chamerion angustifolium</i>: Implications for rapid speciation

Husband, Brian C.; Baldwin, Sarah; Sabara, Holly A.

doi:10.3732/ajb.1600097

Cited by 65 publications

(92 citation statements)

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“…This lends tentative support to suggestions that WGDs may fuel species diversification (27), possibly via the establishment of reproductive barriers (31).…”

Section: Massive Wgds In Malpighiales-our Analyses Identify An Impressupporting

confidence: 71%

“…In these cases, the potential adaptive value of WGDs is thought to arise from the origin of genetic novelties (19)(20)(21)(22) and by masking the effects of deleterious mutations (23), which may facilitate plant survival across periods of global disruption. Although debate exists as to the influence of WGD on speciation and enhanced species diversification rates (14,(24)(25)(26)(27)(28), it is generally accepted that chromosomal rearrangements from WGDs can significantly accelerate isolating barriers, thus promoting cladogenesis (29)(30)(31). In short, it is established that WGDs are a prominent feature of vascular plant evolution, but the respective phylogenetic distribution, timing, and significance of these ancient events remains unclear.Here, we investigate WGDs in the large and diverse angiosperm order Malpighiales, which contains more than 16,000, mostly tropical, species with tremendous morphological and ecological diversity.…”

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confidence: 99%

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Widespread ancient whole genome duplications in Malpighiales coincide with Eocene global climatic upheaval

Cai

Xi²,

Amorim

et al. 2017

Preprint

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. CC-BY-NC-ND 4.0 International license peer-reviewed) is the author/funder. It is made available under aThe copyright holder for this preprint (which was not . http://dx.doi.org/10.1101/215608 doi: bioRxiv preprint first posted online Nov. 7, 2017; Cai et al. 4 Whole genome duplication (WGD), or polyploidy, is an important evolutionary force that has shaped plant evolution. It has long been appreciated that the formation of recent polyploids in vascular plants is common (1, 2), and mounting evidence suggests that ancient polyploids are more frequent than once thought.Well-cited examples of ancient WGDs have been associated with the origin of several hyperdiverse clades, including in the common ancestor of seed plants, flowering plants, monocots, orchids, core eudicots, mustards (Brassicaceae), legumes (Fabaceae), and sunflowers (Asteraceae) (3-13). In addition, WGDs have been identified in ferns and gymnosperms (14, 15), thus expanding the phylogenetic scope of this phenomenon to span vascular plants. Among these ancient WGDs, several have been dated to the Cretaceous-Tertiary (KT) boundary (~65 Ma), potentially linking these polyploidization events to plants' abilities to survive abrupt global environmental change (16, 17). Similarly, a large number of WGDs have also been reported in grasses during the late Miocene when arid, grass dominated landscapes expanded dramatically (18). In these cases, the potential adaptive value of WGDs is thought to arise from the origin of genetic novelties (19)(20)(21)(22) and by masking the effects of deleterious mutations (23), which may facilitate plant survival across periods of global disruption. Although debate exists as to the influence of WGD on speciation and enhanced species diversification rates (14,(24)(25)(26)(27)(28), it is generally accepted that chromosomal rearrangements from WGDs can significantly accelerate isolating barriers, thus promoting cladogenesis (29-31). In short, it is established that WGDs are a prominent feature of vascular plant evolution, but the respective phylogenetic distribution, timing, and significance of these ancient events remains unclear.Here, we investigate WGDs in the large and diverse angiosperm order Malpighiales, which contains more than 16,000, mostly tropical, species with tremendous morphological and ecological diversity. Members of this clade also include numerous economically important crops such as rubber, cassava, and flax. The Malpighiales have long been recognized as one of the most difficult clades to resolve in the flowering plant tree of life (32, 33), which has been attributed in part to its rapid radiation in the mid-Cretaceous (33, 34). However, recent efforts utilizing phylogenomic approaches have greatly increased our . CC-BY-NC-ND 4.0 International license peer-reviewed) is the author/funder. It is made available under a The copyright holder for this preprint (which was not . http://dx.doi.org/10.1101/215608 doi: bioRxiv preprint first posted online Nov. 7, 2017; Cai et al. 5understanding of deep level rel...

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“…This lends tentative support to suggestions that WGDs may fuel species diversification (27), possibly via the establishment of reproductive barriers (31).…”

Section: Massive Wgds In Malpighiales-our Analyses Identify An Impressupporting

confidence: 71%

mentioning

confidence: 99%

Widespread ancient whole genome duplications in Malpighiales coincide with Eocene global climatic upheaval

Cai

Xi²,

Amorim

et al. 2017

Preprint

View full text Add to dashboard Cite

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“…from the same taxonomic complex) within and beyond the total geographic range are a powerful approach for assessing whether polyploids confer fitness advantages in extreme environments lacking diploids (e.g., Ramsey, 2011;McIntyre & Strauss, 2017). Additional studies are needed to determine whether observed differences between cytotypes of different ploidy levels arise immediately as a result of polyploidization or have evolved over time since the genome duplication event (Ramsey, 2011;Husband et al, 2016). between range size and each predictor variable, which was then transformed to Fisher's z, a metric of standardized effect size for correlations (Koricheva et al, 2013; Methods S1). The final dataset included 123 estimates of z across five categories of intrinsic predictors (dispersal ability, mating system, ploidy, niche breadth, species' age), three categories of extrinsic predictors (range position, environmental heterogeneity, and niche availability), and three categories of range size metrics as responses (area, extent, or filling; Methods S1).…”

Section: Box 3 Ploidy and Range Sizementioning

confidence: 99%

Determinants of geographic range size in plants

2020

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Summary Geographic range size has long fascinated ecologists and evolutionary biologists, yet our understanding of the factors that cause variation in range size among species and across space remains limited. Not only does geographic range size inform decisions about the conservation and management of rare and nonindigenous species due to its relationship with extinction risk, rarity, and invasiveness, but it also provides insights into fundamental processes such as dispersal and adaptation. There are several features unique to plants (e.g. polyploidy, mating system, sessile habit) that may lead to distinct mechanisms explaining variation in range size. Here, we highlight key studies testing intrinsic and extrinsic hypotheses about geographic range size under contrasting scenarios where species' ranges are static or change over time. We then present results from a meta‐analysis of the relative importance of commonly hypothesized determinants of range size in plants. We show that our ability to infer the relative importance of these determinants is limited, particularly for dispersal ability, mating system, ploidy, and environmental heterogeneity. We highlight avenues for future research that merge approaches from macroecology and evolutionary ecology to better understand how adaptation and dispersal interact to facilitate niche evolution and range expansion.

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“…Another nonexclusive explanation for this segregation pattern relies on a differentiation in the biotic niche (Wisz et al, 2013). Divergence in pollinator spectra and/or visit frequency have been found in other polyploids (Kennedy et al, 2006;Thompson & Merg, 2008;Husband et al, 2016). In D. broteri, the reproductive biology of 29, 49 and 69 cytotypes is unknown, but the dodecaploids have showed an extremely specialized pollination (Balao et al, 2011b).…”

Section: Autopolyploidy Niche Evolution and Competitive Interactionsmentioning

confidence: 99%

Niche divergence and limits to expansion in the high polyploid Dianthus broteri complex

2019

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Summary Niche evolution in plant polyploids remains controversial and evidence for alternative patterns has been reported. Using the autopolyploid Dianthus broteri complex (2×, 4×, 6× and 12×) as a model, we aimed to integrate three scenarios – competitive exclusion, recurrent origins of cytotypes and niche filling – into a single framework of polyploid niche evolution. We hypothesized that high polyploids would tend to evolve towards extreme niches when low ploidy cytotypes have nearly filled the niche space. We used several ecoinformatics and phylogenetic comparative analyses to quantify differences in the ecological niche of each cytotype and to evaluate alternative models of niche evolution. Each cytotype in this complex occupied a distinct ecological niche. The distributions were mainly constrained by soil characteristics, temperature and drought stress imposed by the Mediterranean climate. Tetraploids had the highest niche breadth and overlap due to their multiple origins, whereas the higher ploidy cytotypes were found in different, restricted, nonoverlapping niches. Niche evolution analyses suggested a scenario with one niche optimum for each ploidy, including the two independent tetraploid lineages. Our results suggest that the fate of nascent polyploids could not be predicted without accounting for phylogenetic relatedness, recurrent origins or the niche occupied by ancestors.

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Direct vs. indirect effects of whole‐genome duplication on prezygotic isolation inChamerion angustifolium: Implications for rapid speciation

Cited by 65 publications

References 64 publications

Widespread ancient whole genome duplications in Malpighiales coincide with Eocene global climatic upheaval

Widespread ancient whole genome duplications in Malpighiales coincide with Eocene global climatic upheaval

Determinants of geographic range size in plants

Niche divergence and limits to expansion in the high polyploid Dianthus broteri complex

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