Benefits of gene flow are mediated by individual variability in self-compatibility in small isolated populations of an endemic plant species

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dc.contributor.authorFrye, Christopher T.
dc.contributor.authorNeel, Maile C.
dc.date.accessioned2017-08-31T19:52:13Z
dc.date.available2017-08-31T19:52:13Z
dc.date.issued2016-09-05
dc.descriptionPartial funding for Open Access provided by the UMD Libraries' Open Access Publishing Fund.en_US
dc.description.abstractMany rare and endemic species experience increased rates of self-fertilization and mating among close relatives as a consequence of existing in small populations within isolated habitat patches. Variability in self-compatibility among individuals within populations may reflect adaptation to local demography and genetic architecture, inbreeding, or drift. We use experimental hand-pollinations under natural field conditions to assess the effects of gene flow in 21 populations of the central Appalachian endemic Trifolium virginicum that varied in population size and degree of isolation. We quantified the effects of distance from pollen source on pollination success and fruit set. Rates of self-compatibility varied dramatically among maternal plants, ranging from 0% to 100%. This variation was unrelated to population size or degree of isolation. Nearly continuous variation in the success of selfing and near-cross-matings via hand pollination suggests that T. virginicum expresses pseudo-self- fertility, whereby plants carrying the same S-allele mate successfully by altering the self-incompatibility reaction. However, outcrossing among populations produced significantly higher fruit set than within populations, an indication of drift load. These results are consistent with strong selection acting to break down self-incompatibility in these small populations and/or early-acting inbreeding depression expressed upon selfing.en_US
dc.identifierhttps://doi.org/10.13016/M2GH9B90R
dc.identifier.citationEvolutionary Applications. 2017;10:551–562, DOI: 10.1111/eva.12437en_US
dc.identifier.urihttp://hdl.handle.net/1903/19702
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sons Ltd.en_US
dc.relation.isAvailableAtCollege of Agriculture & Natural Resourcesen_us
dc.relation.isAvailableAtPlant Science & Landscape Architectureen_us
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us
dc.subjectendemicen_US
dc.subjectgene flowen_US
dc.subjectindex of self-incompatibilityen_US
dc.subjectmating systemen_US
dc.subjectpseudo-self-fertilityen_US
dc.subjectTrifolium virginicumen_US
dc.titleBenefits of gene flow are mediated by individual variability in self-compatibility in small isolated populations of an endemic plant speciesen_US
dc.typeArticleen_US

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