Results 131 to 140 of about 1,101 (151)
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Oecologia, 2007
Among the factors thought to have favoured the evolution of deception (rewardlessness) in orchids is the reduction of pollinator-mediated selfing when unrewarded pollinators visit fewer flowers per inflorescence. We obtained data on natural levels of geitonogamy in the deceptive orchids Dactylorhiza sambucina and Himantoglossum hircinum by monitoring ...
Matthias, Kropf, Susanne S, Renner
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Among the factors thought to have favoured the evolution of deception (rewardlessness) in orchids is the reduction of pollinator-mediated selfing when unrewarded pollinators visit fewer flowers per inflorescence. We obtained data on natural levels of geitonogamy in the deceptive orchids Dactylorhiza sambucina and Himantoglossum hircinum by monitoring ...
Matthias, Kropf, Susanne S, Renner
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Canadian Journal of Botany, 2004 We estimated geitonogamy in individuals with different inflorescence sizes in a small (100-200 flowering individuals) and a large population (>700 flowering individuals) of the self-compatible, moth-pollinated orchid Platanthera bifolia (L.) L.
J. Maad, L. Reinhammar
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American Journal of Botany, 1992 Internal geitonogamy (IG) is a unique self‐fertilization system that occurs in the genus Callitriche. In IG self‐fertilization is effected by pollen tube growth through vegetative tissues from the staminate to pistillate flowers.
C. Thomas Philbrick, Luis M. Bernardello
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The Role of Geitonogamy in the Gradual Evolution towards Dioecy in Cosexual Plants
Selection, 2002We present a model for the gradual evolution towards dioecy in cosexual plants with geitonogamous selfing. We show how geitonogamous selfing (i.e. transfer of pollen between flowers on the same plant) can facilitate the evolution of dioecy (i.e. separate male and female individuals) in cosexual plants (i.e. both sexual functions on the same plant).
T. J. de Jong, S. A. H. Geritz
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How floral displays affect geitonogamy in an upward foraging bumblebee‐pollinated protandrous plant
Journal of Systematics and Evolution, 2019AbstractReducing geitonogamy (pollen transfer among flowers within the same plant) has been suggested as a major selective force for plants with multiple flowers. The occurrence of geitonogamy is generally different among flowers within inflorescences; however, no researchers have examined whether plants enlarge their display size without increasing ...
Xing‐Fu Zhu +2 more
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International Journal of Plant Sciences, 2006
A flexible mating system may enable self‐compatible plants to prevent self‐fertilization under certain circumstances. Campanulastrum americanum is a self‐compatible, protandrous herb. Although within‐plant pollen transfer is likely and self pollen can produce a full set of seeds, selfing in natural populations is rare.
Leah J. Kruszewski, Laura F. Galloway
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A flexible mating system may enable self‐compatible plants to prevent self‐fertilization under certain circumstances. Campanulastrum americanum is a self‐compatible, protandrous herb. Although within‐plant pollen transfer is likely and self pollen can produce a full set of seeds, selfing in natural populations is rare.
Leah J. Kruszewski, Laura F. Galloway
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American Journal of Botany, 2003
The role of geitonogamy in the evolution of inflorescence design is not well understood. The plant's dilemma hypothesis proposes that evolution of larger inflorescences is driven by selection for greater pollinator attraction, but constrained by higher rates of geitonogamy experienced by larger inflorescences.
Matthew S, Finer, Martin T, Morgan
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The role of geitonogamy in the evolution of inflorescence design is not well understood. The plant's dilemma hypothesis proposes that evolution of larger inflorescences is driven by selection for greater pollinator attraction, but constrained by higher rates of geitonogamy experienced by larger inflorescences.
Matthew S, Finer, Martin T, Morgan
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Geitonogamy: a mechanism responsible for high selfing rates in borage (Borago officinalis L.)
Theoretical and Applied Genetics, 2001Borage, a species traditionaly defined as allogamous, has revealed a high selfing rate although a mechanism of protandry has been confirmed in this plant. Studies investigating flower behaviour showed that several flowers open every day and that others are also receptive at the same time within a plant.
C. Montaner, E. Floris, J. M. Alvarez
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Evolutionary Ecology, 2002
Many orchid species are unusual in that they provide no nectar or pollen rewards for their pollinators. Absence of reward is expected to have a fundamental effect on pollinator visitation patterns. In particular the number of flowers visited per inflorescence is expected to be affected in both unrewarding and co-flowering rewarding species.
Jean-Baptiste Ferdy, Ann Smithson
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Many orchid species are unusual in that they provide no nectar or pollen rewards for their pollinators. Absence of reward is expected to have a fundamental effect on pollinator visitation patterns. In particular the number of flowers visited per inflorescence is expected to be affected in both unrewarding and co-flowering rewarding species.
Jean-Baptiste Ferdy, Ann Smithson
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Effects of Geitonogamy on the Seed Set of Magnolia obovata Thunb. (Magnoliaceae)
International Journal of Plant Sciences, 2003The effects of geitonogamy on the seed set of a protogynous hermaphroditic tree, Magnolia obovata Thunb., were investigated by electrophoretic allozyme analysis and pollination experiments. The multilocus outcrossing rates (tm) estimated in 1995 and 1997 by using four polymorphic loci were 0.39 and 0.42, respectively, indicating that more than half of ...
Kiyoshi Ishida +2 more
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