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Annals of Botany (1)
Albert, Béatrice (2)
David, Jean R. (1)
Debat, Vincent (1)
Dreyer, Leanne (1)
Gidaszewski, Nelly (1)
Hivert, Jean (1)
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The Drosophilidae (Diptera) of the Scattered Islands, with the description of a novel association with Leptadenia madagascariensis Decne. (Apocynaceae)
David, Jean R.
Thirteen drosophilid species belonging to seven genera and two subfamilies are reported from three coral islands (namely Europa, Juan de Nova and Glorioso) that belong to the Scattered Islands in the Indian Ocean. Five species are cosmopolitan and five are African. Three are endemic to the insular Western Indian Ocean, including a presumably new Scaptodrosophila species. On the island of Juan de Nova, most captured flies had pollinia attached to the bases of their proboscis. DNA analysis using the rbcl gene revealed that these pollinia belong to the genus Leptadenia (Apocynaceae), of which a single species L. madagascariensis, endemic in Madagascar and Comoros, is present in this island. This is the first reported association between this plant and drosophilids.
taxonomy; DNA barcoding; island biogeography; myophily; conservation
The influence of tetrad shape and intersporal callose wall formation on pollen aperture pattern ontogeny in two eudicot species
Annals of Botany
Background and Aims
In flowering plants, microsporogenesis is accompanied by various types of cytoplasmic partitioning (cytokinesis). Patterns of male cytokinesis are suspected to play a role in the diversity of aperture patterns found in pollen grains of angiosperms. The relationships between intersporal wall formation, tetrad shape and pollen aperture pattern ontogeny are studied.
A comparative analysis of meiosis and aperture distribution was performed within tetrads in two triporate eudicot species with contrasting aperture arrangements within their tetrads [Epilobium roseum (Onagraceae) and Paranomus reflexus (Proteaceae)].
Key Results and Conclusions
Intersporal wall formation is a two-step process in both species. Cytokinesis is first achieved by the formation of naked centripetal cell plates. These naked cell plates are then covered by additional thick, localized callose deposits that differ in location between the two species. Apertures are finally formed in areas in which additional callose is deposited on the cell plates. The recorded variation in tetrad shape is correlated with variations in aperture pattern, demonstrating the role of cell partitioning in aperture pattern ontogeny.
Microsporogenesis; tetrad shape; aperture; callose; Epilobium roseum; Paranomus reflexus
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