Genetic Architecture of Inbreeding Depression and the Maintenance of Gametophytic Self‐incompatibility

Gervais, Camille; Awad, Diala Abu; Roze, Denis; Castric, Vincent; Billiard, Sylvain

doi:10.1111/evo.12495

Cited by 32 publications

(64 citation statements)

References 36 publications

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“…Note that when d p = 0, we recovered the same situation as in isolated populations (Gervais et al. ) for the same deme size. Note also that in contrast to the analytical model, SC mutants can occur in any deme.…”

Section: Methodssupporting

confidence: 76%

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Breakdown of gametophytic self‐incompatibility in subdivided populations

2020

Self Cite

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In many hermaphroditic flowering plants, self‐fertilization is prevented by self‐incompatibility (SI), often controlled by a single locus, the S‐locus. In single isolated populations, the maintenance of SI depends chiefly on inbreeding depression and the number of SI alleles at the S‐locus. In subdivided populations, however, population subdivision has complicated effects on both the number of SI alleles and the level of inbreeding depression, rendering the maintenance of SI difficult to predict. Here, we explore the conditions for the invasion of a self‐compatible mutant in a structured population. We find that the maintenance of SI is strongly compromised when a population becomes subdivided. We show that this effect is mainly caused by the decrease in the local diversity of SI alleles rather than by a change in the dynamics of inbreeding depression. Strikingly, we also find that the diversity of SI alleles at the whole population level is a poor predictor of the maintenance of SI. We discuss the implications of our results for the interpretation of empirical data on the loss of SI in natural populations.

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Section: Methodssupporting

confidence: 76%

“…Gervais et al. () explicitly modeled the accumulation of partially recessive mildly deleterious mutations and considered inbreeding depression as a dynamic variable rather than a fixed parameter in a single SI population. They showed that allowing inbreeding depression to vary had only a marginal impact on the parameter range under which SI is maintained.…”

mentioning

confidence: 99%

Breakdown of gametophytic self‐incompatibility in subdivided populations

2020

Self Cite

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“…Alternatively, variability in the success of self‐ and near‐cross‐pollination could be due to early‐acting inbreeding depression because the former is the most extreme form of inbreeding and the latter likely due to mating by individuals that were already closely related. According to theory, maintenance of a self‐incompatible genetic system is linked with strong inbreeding depression (Gervais, Awad, Roze, Castric, & Billiard, ). A self‐compatible mutant that arises within a self‐incompatible population should spread rapidly as long as the costs of selfing do not exceed the 50% transmission advantage and the benefit of reproductive assurance.…”

Section: Discussionmentioning

confidence: 99%

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

Frye

Neel

2016

Evolutionary Applications

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Many 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.

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“…Hal ini mungkin disebabkan oleh kontaminasi serbuksari dari bunga lainnya dalam satu pohon, atau terdapat kecocokan berkawin sendiri antar bunga dalam satu tandan yang sangat rendah. Hasil ini menunjukkan bahwa metode tersebut tidak dapat digunakan untuk mengetahui pengaruh perkawinan sendiri, dikarenakan bunga jenis ini tersusun dalam malai dengan pertumbuhan yang acropetal sehingga dimungkinkan kuncup bunga sebelum mekar sudah terkontaminasi serbuk lainnya yang sudah mekar terlebih dahulu (Gervais, Awad, Roze, Castric, & Billiard, 2014). Kapsul yang terbentuk dari penyerbukan buatan sendiri terkendali maupun silang terkendali dapat digunakan untuk menduga indeks ketidakcocokan berkawin sendiri (Index of Self Incompatibility/ISI) yang merupakan rasio terbentuknya buliran biji kedua tipe penyerbukan tersebut (Dafni, 1992;Zapata & Arroyo, 1978).…”

Section: Persen Jadi Kapsulunclassified

DEPRESI SILANG DALAM BIJI DAN SEMAI Melaleuca alternifolia

Baskorowati¹

2017

JPTH

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ABSTRAKPohon Melaleuca alternifolia atau tea tree, dikenal sebagai penghasil minyak atsiri. Spesies ini secara komersial sangat penting sebagai sumber penghasil minyak atsiri di Australia. Untuk meningkatkan kualitas minyaknya, penelitian dengan melakukan penyerbukan buatan antara pohon plus harus dilakukan. Informasi mengenai ketidakcocokan menyerbuk sendiri dan depresi silang dalam sebaiknya diketahui untuk menunjang keberhasilan penyerbukan. Penelitian ini ditujukan untuk mempelajari ketidakcocokan menyerbuk sendiri serta depresi silang dalam yang mungkin terjadi dengan melakukan persilangan terkendali baik penyerbukan sendiri maupun penyerbukan silang. Persilangan terkendali dilakukan pada empat pohon contoh; untuk penyerbukan sendiri secara alami dilakukan dengan membungkus kuncup-kuncup bunga yang belum membuka tanpa melakukan emaskulasi dan melakukan perhitungan jumlah kapsul yang terbentuk. Hasil penelitian menunjukan bahwa tidak ada satupun kapsul yang terbentuk dari perlakuan penyerbukan sendiri terkendali (karena indeks ketidakcocokan menyerbuk sendiri = 0) meskipun kemampuan penyerbukan sendiri secara alami pada beberapa famili dapat terjadi dengan tingkat yang sangat rendah (indeks ketidak cocokan menyerbuk sendiri = 0,24). Dengan demikian dapat disimpulkan bahwa ketidakcocokan menyerbuk sendiri terjadi dengan tingkat yang sangat tinggi. Depresi silang dalam juga terjadi yang diperlihatkan oleh rendahnya kapsul yang terbentuk, rendahnya kemampuan berkecambah biji hasil penyerbukan sendiri dibandingkan dengan penyerbukan silang terkendali. Pertumbuhan yang lambat pada semai hasil penyerbukan sendiri dibandingkan dengan penyerbukan silang terkendali mendukung bukti terjadinya depresi silang dalam pada spesies ini.Kata kunci: tea tree, ketidakcocokan berkawin sendiri, penyerbukan sendiri, kemampuan berkecambah, pertumbuhan semai

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Genetic Architecture of Inbreeding Depression and the Maintenance of Gametophytic Self‐incompatibility

Abstract: Gametophytic self-incompatibility (GSI) is

Cited by 32 publications

References 36 publications

Breakdown of gametophytic self‐incompatibility in subdivided populations

Breakdown of gametophytic self‐incompatibility in subdivided populations

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

DEPRESI SILANG DALAM BIJI DAN SEMAI Melaleuca alternifolia

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