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• W2049053447 abstract "Some species produce pollen grains with different aperture numbers within a single individual (pollen aperture heteromorphism). In the pansy Viola diversifolia, aperture number is positively correlated with pollen germination speed, and negatively correlated with viability. In V. calcarata, young five-aperturate pollen grains germinate faster than four-aperturate ones. Heteromorphism could thus be favoured when pollination is unpredictable, as plants produce both very competitive and long-lived pollen grains. Depending on the efficiency of the pollinators, different proportions of pollen types will be optimal. In insect-pollinated species, such as V. calcarata, pollination efficiency generally decreases as elevation increases. We therefore expect a decrease in mean aperture number as altitude increases. This was found in four transects (out of six). Pollinator activity therefore has a potential impact on pollen morphology. Certaines espèces produisent des grains de pollen avec des nombres d'apertures différents dans un même individu (hétéromorphisme pollinique). Chez la pensée Viola diversifolia, le nombre d'apertures est positivement corrélé à la vitesse de germination du pollen et négativement à sa survie. Chez V. calcarata, les jeunes grains de pollen 5-aperturés germent plus rapidement que les 4-aperturés. L'hétéromorphisme permettrait donc de répondre à une pollinisation imprévisible, les plantes produisant à la fois des grains de pollen très compétitifs et d'autres à longue survie. Selon l'efficacité de la pollinisation, différentes proportions des types polliniques seront donc sélectionnées. Chez les plantes entomophiles, comme V. calcarata, l'efficacité de la pollinisation décroît avec l'altitude. Nous attendons ainsi une décroissance du nombre moyen d'apertures lorsque l'altitude augmente. C'est ce qui a été trouvé dans quatre localités (sur six observées). L'activité des pollinisateurs est donc un facteur pouvant influer sur la morphologie pollinique." @default.
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• W2049053447 date "1999-07-01" @default.
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• W2049053447 title "Pollen aperture heteromorphism. Variation in pollen-type proportions along altitudinal transects in Viola calcarata" @default.
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• W2049053447 doi "https://doi.org/10.1016/s0764-4469(00)88528-5" @default.
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