Results 121 to 130 of about 642 (141)
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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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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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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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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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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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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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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. C. Rich. (Orchidaceae).
Johanne Maad, Lars Gunnar Reinhammar
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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. C. Rich. (Orchidaceae).
Johanne Maad, Lars Gunnar Reinhammar
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Annals of Applied Biology
Abstract Most pear cultivars require cross‐pollination to enhance yields in both self‐fertile and partially self‐fertile cultivars. Due to the deficit of wild bees and the limited pollination efficiency of honey bees, alternative commercial pollinators should be considered.
Karol Giejdasz +3 more
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Abstract Most pear cultivars require cross‐pollination to enhance yields in both self‐fertile and partially self‐fertile cultivars. Due to the deficit of wild bees and the limited pollination efficiency of honey bees, alternative commercial pollinators should be considered.
Karol Giejdasz +3 more
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How far does pollinator behaviour -conditioned by floral rewards- determine geitonogamy rate?
2012The quality and quantity of floral rewards, together with pattern of presentation, “drive” pollinator visits within and among plants. In multi-flowering species, besides floral traits and display, the degree of geitonogamous pollination is determined by intra-plant pollinator movements.
ROSSI, MARTINA +3 more
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2011
Dactylorhiza maculata is a common terrestrial orchid in Finland. It is nectarless and the seed production is relatively high for a deceptive species. The pollinators of D. maculata do not have frequent visits to the flowers, but the species is capable of over 50 % seed capsule production.
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Dactylorhiza maculata is a common terrestrial orchid in Finland. It is nectarless and the seed production is relatively high for a deceptive species. The pollinators of D. maculata do not have frequent visits to the flowers, but the species is capable of over 50 % seed capsule production.
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