Results 111 to 120 of about 642 (141)

The Role of Geitonogamy in the Gradual Evolution towards Dioecy in Cosexual Plants

Selection, 2002
We 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).
Tom De Jong
exaly   +2 more sources

Contributions of Autogamy and Geitonogamy to Self-Fertilization in a Mass-Flowering, Clonal Plant

Ecology, 2000
The fitness consequences of self-fertilization are largely determined by how self-pollination occurs. Within-flower self-pollination (autogamy) may be advantageous, since it can provide reproductive assurance without much seed or pollen discounting. In contrast, between-flower self-pollination (geitonogamy) provides no reproductive assurance and can ...
exaly   +4 more sources

The relationship between floral display size, pollen carryover and geitonogamy in Myosotis colensoi (Kirk) Macbride (Boraginaceae)

Biological Journal of the Linnean Society, 1992
The relative amounts of self- and cross-pollen deposited on stigmas depends on both the number of pollinator visits that occur within plants and the amount of pollen carryover. Data collected for Myosotis colensoi (Kirk) Macbride and compiled from a survey of the literature, reveal that pollen carryover is frequently very high (upwards of 80%) and this
Alastair Robertson, Robertson Alastair W   +1 more
exaly   +2 more sources

Plant size, geitonogamy and seed set in Ipomopsis aggregata

Oecologia, 1992
We used powdered fluorescent dyes to estimate receipt of self vs. outcross pollen in the self-incompatible species Ipomopsis aggregata (Polemoniaceae). Flowers on small and large plants received equal amounts of outcross pollen, whereas flowers on large plants received more self pollen, so the proportion of self pollen delivered through geitonogamy ...
Tom J, de Jong, Nickolas M, Waser, Mary V, Price, Richard M, Ring   +3 more
openaire   +2 more sources

Opportunities for geitonogamy in the clonal herb Maianthemum dilatatum

Canadian Journal of Botany, 2005
Clonal plant species have a diverse range of morphologies, which influences the spatial proximity of clonemates, which may affect the rate of geitonogamy. This study measured fine-scale clonal structure, pollinator behaviour, and impacts of geitonogamy on seed set in Maianthemum dilatatum (A. Wood) Nels. & J.F.
Amy S.G. Wilson, Bart J. van der Kamp, Carol Ritland   +2 more
openaire   +1 more source

TAXONOMIC AND GEOGRAPHIC DISTRIBUTION OF INTERNAL GEITONOGAMY IN NEW WORLD CALLITRICHE (CALLITRICHACEAE)

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
openaire   +1 more source

Pollinator directionality as a response to nectar gradient: promoting outcrossing while avoiding geitonogamy

Plant Biology, 2011
AbstractPlants with multiple flowers could be prone to autonomous self‐pollination and insect‐mediated geitonogamy, but physiological and ecological features have evolved preventing costs related to autogamy. We studied the rare perennial herb Dictamnus albus as a model plant, with the aim of describing the plant–pollinator system from both plant and ...
FISOGNI, ALESSANDRO, CRISTOFOLINI, GIOVANNI, ROSSI, MARTINA, GALLONI, MARTA   +3 more
openaire   +4 more sources

The Contribution of Display Size and Dichogamy to Potential Geitonogamy in Campanula americana

International Journal of Plant Sciences, 2002
An increase in floral display size may enhance fitness by increasing a plant’s attractiveness to pollinators. Alternatively, a larger display may reduce fitness by increasing pollen movement within an individual. In dichogamous species the frequency of this geitonogamy also depends on floral gender ratio and pollinator response to floral gender and to ...
Laura F. Galloway, Tammy Cirigliano, Kristina Gremski   +2 more
openaire   +1 more source

GEITONOGAMY IN ANIMAL POLLINATED TROPICAL ANGIOSPERMS

TAXON, 1976
SummaryRecent reproductive biology studies reveal high levels of self‐incompatibility in species diverse tropical communities. Many tropical trees are animal pollinated, pollen transfer patterns closely following the energetics of foraging. The energy output (in the form of nectar, pollen and other food bodies) of a single massively flowering tropical ...
openaire   +1 more source

Pollinator-mediated selfing in two deceptive orchids and a review of pollinium tracking studies addressing geitonogamy

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
openaire   +2 more sources