POLLEN DISCOUNTING AND THE SPREAD OF A SELFING VARIANT IN TRISTYLOUS EICHHORNIA PANICULATA: EVIDENCE FROM EXPERIMENTAL POPULATIONS

@article{Kohn1994POLLENDA,
  title={POLLEN DISCOUNTING AND THE SPREAD OF A SELFING VARIANT IN TRISTYLOUS EICHHORNIA PANICULATA: EVIDENCE FROM EXPERIMENTAL POPULATIONS},
  author={Joshua R. Kohn and Spencer C. H. Barrett},
  journal={Evolution},
  year={1994},
  volume={48}
}
Floral traits that increase self‐fertilization are expected to spread unless countered by the effects of inbreeding depression, pollen discounting (reduced outcross pollen success by individuals with increased rates of self‐fertilization), or both. Few studies have attempted to measure pollen discounting because to do so requires estimating the male outcrossing success of plants that differ in selfing rate. In natural populations of tristylous Eichhornia paniculata, selfing variants of the mid… 
POLLEN DISCOUNTING AND THE EVOLUTION OF SELFING IN ARENARIA UNIFLORA (CARYOPHYLLACEAE)
  • L. Fishman
  • Biology
    Evolution; international journal of organic evolution
  • 2000
TLDR
Investigation of measures of pollen import and export by focal plants in genotyped arrays to investigate the effects of floral morphology and pollination environment on self and outcross male function in an autogamous population of Arenaria uniflora.
Variation in Outcrossing Rates in Eichhornia paniculata: Temporal Changes in Populations of Contrasting Style Morph Structure
TLDR
The significance of temporal variation in outcrossing frequency in plant populations is discussed in relation to its effect on population genetic structure and recent models of mating-system evolution.
POLLINATOR‐MEDIATED COMPETITION, REPRODUCTIVE CHARACTER DISPLACEMENT, AND THE EVOLUTION OF SELFING IN ARENARIA UNIFLORA (CARYOPHYLLACEAE)
  • L. Fishman, R. Wyatt
  • Environmental Science
    Evolution; international journal of organic evolution
  • 1999
TLDR
Heterospecific pollen transfer appears to be the primary mechanism of pollinator‐mediated competition in Arenaria and may be responsible for the evolution of a highly reduced floral morphology in A. uniflora selfers as well as their current geographical distribution.
ECOLOGICAL CONTEXT OF THE EVOLUTION OF SELF‐POLLINATION IN CLARKIA XANTLANA: POULATION SIZE, PLANT COMMUNITIES, AND REPRODUCTTIVE ASSURANCE
TLDR
Evidence is found for context‐dependent selection on herkogamy and protandry via female fitness in which reduced traits, which promote autonomous selfing, were favored in small populations isolated from congeners whereas selection was comparatively weak in large populations or when congeners were present.
TRANSMISSION ADVANTAGE FAVORS SELFING ALLELE IN EXPERIMENTAL POPULATIONS OF SELF‐INCOMPATIBLE WITHERINGIA SOLANACEA (SOLANACEAE)
TLDR
It was shown that self‐compatibility in this species segregates with variation at the S‐locus as inherited by plants in F1 and F2 generations, and although the selfing allele did not provide reproductive assurance under observed conditions, it also did not cause pollen discounting, so the transmission advantage of selfing should promote its spread.
Emasculation increases seed set in the bird-pollinated hermaphrodite Kniphofia linearifolia (Xanthorrhoeaceae): evidence for sexual conflict?
TLDR
Results show that female performance in hermaphroditic flowers can be enhanced when flowers are emasculated, even if the overall number of pollinator visits is decreased.
ECOLOGICAL CONTEXT OF THE EVOLUTION OF SELF-POLLINATION IN CLARKIA XANTIANA: POPULATION SIZE, PLANT COMMUNITIES, AND REPRODUCTIVE ASSURANCE
TLDR
Evidence is found for context-dependent selection on herkogamy and protandry via female fitness in which reduced traits, which promote autonomous selfing, were favored in small populations isolated from congeners whereas selection was comparatively weak in large populations or when congeners were present.
Inheritance of mating-system modifier genes in Eichhornia paniculata (Pontederiaceae)
TLDR
The results provide evidence that the evolution of self-fertilization in E. paniculata has occurred by different genetic pathways and suggest that the sequence of events commences with the fixation of recessive alleles affecting only filament length, followed by evolution at modifier loci responsible for larger phenotypic changes to floral architecture.
Timing of self-compatibility, flower longevity, and potential for male outcross success in Leptosiphon jepsonii (Polemoniaceae).
TLDR
It is argued that this effect is likely to be most pronounced under intermediate rates of pollinator visitation, indicating a potential for selfing-induced flower senescence to incur pollen discounting in Leptosiphon jepsonii.
Mating strategies in flowering plants: the outcrossing-selfing paradigm and beyond.
  • S. Barrett
  • Biology
    Philosophical transactions of the Royal Society of London. Series B, Biological sciences
  • 2003
TLDR
The results from experiments with marker genes and floral manipulations provide evidence for the function of herkogamy and dichogamy in reducing self-pollination and promoting pollen dispersal and evidence is presented indicating that increased selfing resulting from changes to floral design, or geitonogsamy in large clones, can act as a stimulus for the evolution of dioecy.
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References

SHOWING 1-10 OF 144 REFERENCES
CONTRIBUTION OF CRYPTIC INCOMPATIBILITY TO THE MATING SYSTEM OF EICHHORNIA PANICULA TA (PONTEDERIACEAE)
  • M. Cruzan, S. Barrett
  • Environmental Science
    Evolution; international journal of organic evolution
  • 1993
TLDR
The ability to produce mostly outcrossed progeny when pollinators are abundant, but to reliably produce seed under a variety of environmental and demographic conditions may be favored in E. paniculata because of its colonizing life history and occurrence in ephemeral habitats.
Multiple origins of self‐fertilization in tristylous Eichhornia paniculata (Pontederiaceae): Inferences from style morph and isozyme variation
TLDR
Genetic and morphological evidence suggest that style morphs are lost repeatedly from populations of E. paniculata and that selfing variants may have originated on at least three separate occasions in northeastern Brazil.
Floral manipulations reveal the cause of male fitness variation in experimental populations of Eichhornia paniculata (Pontederiaceae)
TLDR
Observations of pollinators and floral manipulations of genetically marked plants in experimental populations were used to evaluate three potential causes of differential siring success: pollinators prefer the S morph leading to higher male success; long styles interfere with pollen pick-up by insect visitors; and pollen from long-level anthers of the S Morph sires more seeds on the M morph than pollen from short-levelAnthers from the L morph.
ABSENCE OF POLLEN DISCOUNTING IN A GENOTYPE OF IPOMOEA PURPUREA EXHIBITING INCREASED SELFING
TLDR
It is suggested that elevated selfing and enhanced success at pollen donation contribute to maintenance of the white allele in natural populations of morning glories.
Inheritance of mating-system modifier genes in Eichhornia paniculata (Pontederiaceae)
TLDR
The results provide evidence that the evolution of self-fertilization in E. paniculata has occurred by different genetic pathways and suggest that the sequence of events commences with the fixation of recessive alleles affecting only filament length, followed by evolution at modifier loci responsible for larger phenotypic changes to floral architecture.
POLLEN‐OVULE RATIOS: A CONSERVATIVE INDICATOR OF BREEDING SYSTEMS IN FLOWERING PLANTS
  • R. Cruden
  • Environmental Science
    Evolution; international journal of organic evolution
  • 1977
TLDR
The overall objective is to show that PIO's reflect the likelihood of sufficient pollen grains reaching each stigma to result in maximum seed set and suggest that PI O's are integrated with other facets of a plant's breeding system.
THE DISSOLUTION OF A COMPLEX GENETIC POLYMORPHISM: THE EVOLUTION OF SELF‐FERTILIZATION IN TRISTYLOUS EICHHORNIA PANICULATA (PONTEDERIACEAE)
TLDR
Eichhornia paniculata (Pontederiaceae) displays a wide range of outcrossing levels as a result of the dissolution of the tristylous genetic polymorphism and the evolution of semihomostyly, and Stamen modifications promoting selfing were largely confined to the M morph.
A high rate of self-fertilization and increased seed fertility of homostyle primroses
TLDR
It is shown that the self-fertile homostyle variant of the primrose Primula vulgaris, which reaches high frequencies in certain populations11, experiences a fertility advantage, in terms of seeds per plant, as a result of its high rate of self-Fertilization.
THE IMPACT OF A FLOWER‐COLOR POLYMORPHISM ON MATING PATTERNS IN EXPERIMENTAL POPULATIONS OF WILD RADISH (RAPHANUS RAPHANISTRUM L.)
TLDR
It is concluded that the male‐fitness advantage of the yellow morph resulted from enhanced pollen export due to the greater attractiveness of its flowers to insect pollinators.
EXPERIMENTAL STUDIES ON THE FUNCTIONAL SIGNIFICANCE OF HETEROSTYLY
  • J. Kohn, S. Barrett
  • Environmental Science
    Evolution; international journal of organic evolution
  • 1992
TLDR
Experimental manipulation of the morph structure of garden populations of self‐compatible, tristylous Eichhornia paniculata suggests that the selective basis for the establishment of floral polymorphism could have been increased pollen transfer rather than higher levels of outcrossing.
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