First-pollination primacy and pollen selection in the morning glory, Ipomoea purpurea

Epperson, Bryan K.; Clegg, Michael T.

doi:10.1038/hdy.1987.2

Cited by 67 publications

(51 citation statements)

References 33 publications

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“…patterns of pollinator movement (Smyth & Hamrick, 1984;Murawski & Hamrick, 1992); aspects of floral morphology (Humphreys & Gale, 1974;Epperson & Clegg, 1987;Motten & Antonovics, 1992;Damgaard & Loeschcke, 1994); and genetic differences in levels of self-fertility (Warwick & Thompson, 1989). In this experiment, outcrossing rates of individual M. ringens genets were significantly correlated with anther-stigma separation.…”

Section: Discussionmentioning

confidence: 55%

Outcrossing rates of individual Mimulus ringens genets are correlated with anther–stigma separation

et al. 1997

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Anther-stigma separation (herkogamy) is highly variable within populations of Mimulus ringens, a bumblebee-pollinated perennial herb with a mixed-mating system. The relationship between this floral trait and individual outcrossing rates was studied in two experimental populations composed of genets with unique multilocus combinations of homozygous genotypes. This facilitated determination of individual outcrossing rates through unambiguous assignment of paternity to all 1560 sampled progeny. In each population there was significant heterogeneity among maternal families in frequencies of self and outcross progeny. Individual outcrossing rates were positively correlated with anther-stigma separation.

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Section: Discussionmentioning

confidence: 55%

Outcrossing rates of individual Mimulus ringens genets are correlated with anther–stigma separation

et al. 1997

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“…Work with experimental populations containing the white and pigmented floral morphs of Ipomoea purpurea is similar to our own in exemplifying the dependence of both outcrossing rates and male outcrossing success on population morph structure (Schoen and Clegg 1985;Epperson and Clegg 1987;Rausher et al 1993). When white-flowered morphs are at higher frequency than pigmented morphs in experimental populations, the frequency ofself-fertilization and the male outcrossing success of both morphs are equal.…”

Section: Resultsmentioning

confidence: 61%

“…Studies ofthe evolutionary ecology offloral form need to take into account each of these three components of reproductive success when evaluating the costs and benefits of floral variation in hermaphroditic plants (Horovitz and Harding 1972;Horovitz 1978;Ennos 1981;Bell 1985;Devlin and Stephenson 1987;Campbell 1989;Galen 1989;Harder and Thomson 1989;Barrett and Eckert 1990;Brown 1990;Johnston 1991;Stanton et al 1991;Kohn and Barrett 1992a). Such an assessment may be complicated, however, because the fitness consequences of a given morphology are not a static property but will likely vary with environmental and demographic contexts, including plant and pollinator densities and the morphological attributes of conspecific neighbors (Antonovics and Levin 1980;Thomson and Barrett 1981;Epperson and Clegg 1987;Gregorius et al 1987;Holsinger 1991Holsinger , 1992Rausher et al 1993).…”

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confidence: 99%

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

Kohn

Barrett

1994

Evolution

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Abstracto-Roral 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 selling rate. In natural populations of tristylous Eichhornia paniculata, selling variants of the mid-styled morph are usually absent from populations containing all three style morphs but often predominate in nontrimorphic populations. We used experimental garden populations of genetically marked plants to investigate whether the effects of population morph structure on relative gamete transmission by unmodilied (M) and sellingvariants (M') of the mid-styled morph could explain their observed distribution. Transmission through ovules and self and outcross pollen by plants of the M and M' morphs were compared under trimorphic, dimorphic (S morph absent), and monomorphic (L and S morphs absent) population structures. Neither population structure nor floralmorphologyaffectedfemale reproductive success,but both had strong effects on the relative transmission of male gametes. The frequency of self-fertilization in the M' morph was consistently higher than that of the M morph under all morph structures, and the frequency of self-fertilization by both morphs increased as morph diversity of experimental populations declined. In trimorphic populations, total transmission by the M and M' morphs did not differ. The small, nonsignilicant increase in selling by the M' relative to the M morph was balanced by decreased outcross siring success,particularly on the S morphoIn populations lackingthe S morph, male gamete transmission by the M' morph was approximately 1.5 times greater than that by the M morph because of both increased selling and increased success through outcross pollen donation. Therefore, gamete transmission strongly favored the M' morph only in the absence of the S morph, a result consistent with the distribution of the M' morph in nature. This study indicates that floral traits that alter the selling rate can have large and context-dependent influences on outcross pollen donation.Key words.-Context-dependent transmission, Eichhornia paniculata, experimental populations, mating systems, pollen discounting, self-fertilization, tristyly.Received June 17, 1993. Accepted December 7, 1993 Evolutionary modifications in floral morphology can affect plant fitness by altering any of three distinct features of the mating process: female reproductive success (seed set), male reproductive success through self-fertilization, and male success through outcross pollen donation. Studies ofthe evolutionary ecology offloral form need to take into account each of these three components of reproductive success when evaluating the costs and benefits of floral variation in hermaphroditic plants

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“…Correlation of outcrossed paternity may also occur when the number of potential male parents is low or mating is mainly between near-neighbours (Surles et al, 1990), or if pollen is deposited as multiple grains such as pollinia or polyads (Schoen & Clegg, 1984;Muona et al, 1991). Alternatively, multiplicity of paternity in a fruit can arise by deposition of one or more pollen loads from different male parents by a single pollinator (Marshall & Ellstrand, 1985;Epperson & Clegg, 1987), or from sequential visits by several pollinators each carrying pollen from different single sources, or carrying mixed pollen loads (Dudash & Ritland, 1991).…”

Section: Introductionmentioning

confidence: 99%

Multiple paternity in Eucalyptus rameliana (Myrtaceae)

Sampson

1998

Heredity

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Estimates of the level of multiple paternity/correlated outcrossing within and between fruits in a predominantly outbreeding population of the bird-pollinated mallee, Eucalyptus rameliana, were made using six allozyme loci. The correlation of outcrossed paternity (r p ) was positive and significant within fruits (0.26) and the effective number of mates for a single fruit was estimated to be 3.85. This correlation was attributed to the low number of potential male parents and pollen-bearing flowers available at any one time in the population. Although consistent with suggestions that correlation of paternity may be a general feature of animal-pollinated plants, the level in E. rameliana was remarkably low considering its population size and phenology. There was no significant correlation of paternity between fruits, probably because flowers were pollinated at different times during the long season. Individual plants differed greatly in both male and female contributions to the next generation, with a small proportion of genotypes located in a small area contributing at least half of the gene pool of the seeds stored in the canopy. In contrast, the male contribution is probably from a wider area. The specialization of floral structure and phenology in E. rameliana for bird-pollination has probably contributed to correlation of paternity within fruits because there are fewer male parents available at any one time than in mass-flowering species. However, the behaviour of the bird pollinators also promotes pollen dispersal and multiplicity of paternity, factors which would be particularly significant when the female contribution to the gene pool is concentrated in a few plants.

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First-pollination primacy and pollen selection in the morning glory, Ipomoea purpurea

Cited by 67 publications

References 33 publications

Outcrossing rates of individual Mimulus ringens genets are correlated with anther–stigma separation

Outcrossing rates of individual Mimulus ringens genets are correlated with anther–stigma separation

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

Multiple paternity in Eucalyptus rameliana (Myrtaceae)

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