| http://dbpedia.org/ontology/abstract
|
Chasmogamia – rodzaj zapylenia zachodzący w otwartym kwiecie. Jej przeciwieństwem jest klejstogamia, zachodząca w kwiecie zamkniętym.
, La chasmogamie (formé à partir des mots gr … La chasmogamie (formé à partir des mots grecs χάσμα / kháasma, « ouverture béante », et γάμος / gámos, mariage), désigne la caractéristique de certaines espèces de plantes de se reproduire avec une reproduction sexuée, par la pollinisation croisée. C'est la caractéristique de base des plantes allogames. Le contraire de la chasmogamie est la cléistogamie (formé à partir des mots grecs κλειστός / kleistós, fermé, et γάμος / gámos, mariage), indiquant une « fleur fermée », qui implique une autopollinisation automatique. C'est la caractéristique de base des plantes autogames (parmi lesquelles la majorité des graminées). Sur une même plante, deux modes de reproduction peuvent être à l'œuvre, avec une partie des fleurs qui s'ouvrent et l'autre partie qui restent fermées, mais à l'intérieur desquelles une autopollinisation s'effectue. Le taux de fleurs ne s'ouvrant pas dépend pour partie, mais pas uniquement de bases génétiques. Suivant ce taux, les plantes sont classées parmi les allogames ou les autogames.sées parmi les allogames ou les autogames.
, La casmogàmia és un tipus de pol·linitzaci … La casmogàmia és un tipus de pol·linització que passa quan la flor està oberta. Les flors que fan servir la casmogàmia s'obren quan arriben a la maduresa, deixant els estams i el pistil exposats als agents pol·linitzadors. El pistil d'aquestes plantes generalment reben el pol·len d'altres plantes. El fenomen contrari es coneix amb el nom de cleistogàmia, és a dir, flors que s'autopol·linitzen.a, és a dir, flors que s'autopol·linitzen.
, Chasmogamy, is a plant reproductive mechan … Chasmogamy, is a plant reproductive mechanism in which pollination occurs in chasmogamous flowers. Chasmogamous flowers are commonly showy with open petals encircling exposed reproductive parts. Chasmogamous stems from Greek for "open marriage", named after the open arrangement of floral structures. Once chasmogamous flowers have reached maturity, they unfurl and their stamens and/or style are made available for pollination. Although some plant species possess self-fertilizing chasmogamous flowers, most chasmogamous flowers are cross-pollinated by biotic (e.g. insects) or abiotic (e.g. wind) agents. Chasmogamous flowers that are cross-pollinated have the advantage of sexual reproduction between two different parents, resulting in sexual recombination and genetically distinct seeds. These distinct seeds increase genetic diversity of the plant population and reduce inbreeding depression and deleterious alleles. Seeds produced by chasmogamous flowers that are cross-pollinated, may also exhibit hybrid vigor (heterosis) and increased fitness. To promote cross-pollination, chasmogamous flowers often have strikingly colored petals and nectar guides/nectaries to attract and reward pollinators. However, these attractive floral organs can be disadvantageous as they are energetically costly to produce and require a surplus of resources. Pollination of chasmogamous flowers is also dependent upon the availability of pollinating agents. Thus, chasmogamous flowers generally develop when resources like light, water, nutrients, and pollinators are high. In contrast to chasmogamous flowers, are minute, bud-like cleistogamous ("closed marriage") flowers, and pollination of cleistogamous flowers is cleistogamy. Unlike chasmogamous flowers, cleistogamous flowers remain mechanically sealed throughout the entirety of their development and reproduction. The closed morphology of cleistogamous flowers hinders them from exposing their reproductive organs and forces self-pollination. Without the need for pollinating agents, cleistogamous flowers lack nectar and elaborate petals, making them much less costly to produce than chasmogamous flowers and developmentally favored in suboptimal conditions. In addition to chasmogamy and cleistogamy, many plant species possess a mixed breeding system that utilizes both chasmogamous and cleistogamous flowers. This breeding system has been referred to under multiple names including true cleistogamy, dimorphic cleistogamy, and the chasmogamous/cleistogamous mixed breeding system. In this mixed breeding system, species produce both chasmogamous and cleistogamous flowers on the same plant. Chasmogamous and cleistogamous flowers may exhibit spatial separation and develop simultaneously at different morphological locations, or the two flowers may be temporally separated and develop at different times during the flowering season. Rarely, the two flowers have also been documented as being both spatially and temporally separated. The presence of both flower types allows mixed breeding system species to cross-pollinate and self-fertilize. This leads to increases in genetic diversity and assures reproductive success in variable environmental and pollinator conditions.e environmental and pollinator conditions.
|
| rdfs:comment |
Chasmogamy, is a plant reproductive mechan … Chasmogamy, is a plant reproductive mechanism in which pollination occurs in chasmogamous flowers. Chasmogamous flowers are commonly showy with open petals encircling exposed reproductive parts. Chasmogamous stems from Greek for "open marriage", named after the open arrangement of floral structures. Once chasmogamous flowers have reached maturity, they unfurl and their stamens and/or style are made available for pollination. Although some plant species possess self-fertilizing chasmogamous flowers, most chasmogamous flowers are cross-pollinated by biotic (e.g. insects) or abiotic (e.g. wind) agents.g. insects) or abiotic (e.g. wind) agents.
, La chasmogamie (formé à partir des mots gr … La chasmogamie (formé à partir des mots grecs χάσμα / kháasma, « ouverture béante », et γάμος / gámos, mariage), désigne la caractéristique de certaines espèces de plantes de se reproduire avec une reproduction sexuée, par la pollinisation croisée. C'est la caractéristique de base des plantes allogames.ctéristique de base des plantes allogames.
, La casmogàmia és un tipus de pol·linitzaci … La casmogàmia és un tipus de pol·linització que passa quan la flor està oberta. Les flors que fan servir la casmogàmia s'obren quan arriben a la maduresa, deixant els estams i el pistil exposats als agents pol·linitzadors. El pistil d'aquestes plantes generalment reben el pol·len d'altres plantes. El fenomen contrari es coneix amb el nom de cleistogàmia, és a dir, flors que s'autopol·linitzen.a, és a dir, flors que s'autopol·linitzen.
, Chasmogamia – rodzaj zapylenia zachodzący w otwartym kwiecie. Jej przeciwieństwem jest klejstogamia, zachodząca w kwiecie zamkniętym.
|
