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4 results for “loss of self-incompatibility”
Data from: The loss of self-incompatibility in a range expansion
<p>It is commonly observed that plant species' range margins are enriched for increased selfing rates and, in otherwise self-incompatible species, for self-compatibility (SC). This has often been attributed to a response to selection under mate and/or pollinator limitation. However, range expansion can also cause reduced inbreeding depression, and this could facilitate the evolution of selfing in the absence of mate or pollinator limitation. Here, we explore this idea using spatially explicit individual-based simulations of a range expansion, in which inbreeding depression, variation in self-incompatibility (SI), and mate availability evolve. Under a wide range of conditions, the simulated range expansion brought about the evolution of selfing after the loss of SI in range-marginal populations. Under conditions of high recombination between the self-incompatibility locus (S-locus) and viability loci, SC remained marginal in the expanded metapopulation and could not invade the range core, which remained self-incompatible. In contrast, under low recombination and migration rates, SC was frequently able to displace SI in the range core by maintaining its association with a genomic background with purged genetic load. We conclude that the evolution of inbreeding depression during a range expansion promotes the evolution of SC at range margins, especially under high rates of recombination.</p>
Data from: The loss of self-incompatibility in a range expansion
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Data from: Rapid loss of self-incompatibility in experimental populations of the perennial outcrossing plant Linaria cavanillesii
Transitions from self-incompatibility (SI) to self-compatibility (SC) in angiosperms may be frequently driven by selection for reproductive assurance when mates or pollinators are rare, and are often succeeded by loss of inbreeding depression by purging. Here we use experimental evolution to investigate the spread of SC from one such population of the perennial plant Linaria cavanillesii into SI populations that still have high inbreeding depression. We introduced SC individuals at different frequencies into replicate experimental populations of L. cavanillesii that varied in access to pollinators. Our experiment revealed a rapid shift to SC in all replicates, driven by both greater seed set and greater outcross siring success of SC individuals. We discuss our results in the light of computer simulations that confirm the tendency of SC to spread into SI populations under the observed conditions. Our study illustrates the ease with which SC can spread among populations, a requisite for species-wide transitions from SI to SC.
Data from: Rapid loss of self-incompatibility in experimental populations of the perennial outcrossing plant Linaria cavanillesii
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