Cryptic self-incompatibility in the wallflower: Cheiranthus cheiri L.

Bateman, A. J.

doi:10.1038/hdy.1956.22

Cited by 180 publications

(123 citation statements)

References 3 publications

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“…The inhibition of self pollen, which occurs within the disc florets of both radiate and nonradiate S. vulgaris, is similar to the cryptic selfincompatibility found in the wallflower, Cheiranthus cheiri L. (Bateman, 1956) and in Amsinckia grandflora Kleeb. (Weller and Ornduff, 1977).…”

Section: Inhibition Of Self Pollen Germination In Disc Floretsmentioning

confidence: 56%

Inhibition of self pollen germination in Senecio vulgaris L.

1988

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Experiments are described which show that Senecio vulgaris L. (common groundsel) possesses two independent systems which inhibit the germination of self pollen. In one system, self but not cross pollen tube penetration of the stigma is prevented in the ray florets of a proportion of radiate plants. In the other system, cross pollen adheres in greater quantity than self pollen 24 hours after application to disc floret stigmas of both radiate and non-radiate plants. The possible origins of these systems, and their functions in natural populations, are discussed.

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Section: Inhibition Of Self Pollen Germination In Disc Floretsmentioning

confidence: 56%

Inhibition of self pollen germination in Senecio vulgaris L.

1988

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“…Mechanisms causing post-pollination siring differences Post-pollination siring advantages to outcross over self pollen have now been demonstrated in several plant species (Bateman, 1956;Glover & Barrett, 1986;Bowman, 1987;Griffin et a!., 1987;Montalvo, 1992;Cruzan & Barrett, 1993;Rigney et aL, 1993). However, in most cases the mechanisms producing the observed variation in siring success have not been clearly identified (Barrett, 1988;Walsh & Charlesworth, 1992).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, a growing body of experimental evidence suggests that 'cryptic' incompatibility occurring before fertilization may limit the amount of self-fertilization in a wide variety of taxa (e.g. Bateman, 1956;Weller & Ornduff, 1977;Glover & Barrett, 1986;Bowman, 1987;Casper et a!., 1988;Cruzan & Barrett, 1993). Yet, despite the potential significance of post-pollination processes to plant mating systems, only a handful of species has been studied experimentally, and in only a few cases have these investigations been combined with the measurement of mating-system parameters in natural populations.…”

Section: Introductionmentioning

confidence: 99%

Post-pollination mechanisms and the maintenance of outcrossing in self-compatible, tristylous, Decodon verticillatus (Lythraceae)

Eckert

Barrett

1994

Heredity

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The mating systems of self-compatible plants may be vulnerable to ecological factors that influence pollen transfer. Post-pollination mechanisms may, however, buffer the mating system against ecological variation. We combined an examination of mating-system variation with experimental studies of pollen competition in a clonal, self-compatible, tristylous plant, Decodon verticillatus (Lythraceae), to assess proximate mechanisms influencing the mating system in natural populations. Outcros sing rates (t) were estimated for 10 populations in a variety of habitats and exhibiting a wide range of size, density and patchiness. We also investigated whether self-compatibility results in departures from disassortative mating, by estimating morph-specific rates of outcrossing and disassortative mating (d). All population-level estimates of t indicated significant self-fertilization (average 1=0.72) and weak disassortative mating (average d 0.30). There were small but significant differences in outcrossing rates among style morphs, with the mid-styled morph outcrossing at a lower rate (0.62) than the short-styled morph (0.81) and the long-styled morph intermediate (0.71). The expectation of wide variation in t among populations was not supported. Populationlevel estimates were distributed over a narrow range (0.63-0.86) with few significant differences. A possible mechanism underlying this pattern was revealed by mixed-donor pollinations. Outcross pollen experienced a substantial siring advantage over self pollen. Outcrossing in D. verticillatus may be maintained by both floral polymorphism and post-pollination mechanisms.

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“…If there are also weak incompatibility alleles, the problems would be even worse. The present paper does not contain any study of such weak alleles, because there is a possibility that they may be involved in "cryptic" incompatibility which is known is several sporophytic incompatibility systems (Bateman, 1956;Weller and Orndufl, 1977). When this occurs, pollen with a weak incompatibility type may be able to effect fertilization when it is present on a certain genotype of stigma, but be partly or completely unable to father progeny when a pollen type that is more compatible with that female genotype is also present (Casper et a!., in press).…”

Section: Discussionmentioning

confidence: 99%

Evolution of homomorphic sporophytic self-incompatibility

Charlesworth

1988

Heredity

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A population genetic model is described for the evolution of sporophytic self-incompatibility by successive mutations to active incompatibility alleles from an ancestral compatibility, Sf, allele, homozygotes for which are capable of selffertilisation. For spread of the active incompatibility alleles there must be strong inbreeding depression. It is shown that polymorphism for the ancestral allele and the active alleles is generated, unless the number of active alleles becomes very large. Thus, although there is selection for alleles that cause outcrossing, such polymorphic populations would not be completely outcrossing, but would have selfing rates between zero and the selfling rate of the homozygote for S1. The equilibrium frequencies of the active alleles depend on whether dominance or independent action is assumed for the alleles in the pistil. In either case the equilibrium allele frequencies are higher than would be the case for gametophytically acting alleles.

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Cryptic self-incompatibility in the wallflower: Cheiranthus cheiri L.

Cited by 180 publications

References 3 publications

Inhibition of self pollen germination in Senecio vulgaris L.

Inhibition of self pollen germination in Senecio vulgaris L.

Post-pollination mechanisms and the maintenance of outcrossing in self-compatible, tristylous, Decodon verticillatus (Lythraceae)

Evolution of homomorphic sporophytic self-incompatibility

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