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Post-meiotic cytokinesis and pollen aperture pattern ontogeny: comparison of development in four species differing in aperture pattern¹

²UMR de Genetique Vegetale, Ferme du Moulon, 91190 Gif-sur-Yvette, France; ³Botany Department, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa; ⁴Laboratoire Ecologie Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, 91405 Orsay cedex, France

ABSTRACT

Pollen aperture patterns vary widely in angiosperms. An increasing number of studies indicate that aperture pattern ontogeny is correlated with the way in which cytokinesis that follows male meiosis is completed. The formation of the intersporal callose walls that isolate the microspores after meiosis was studied in four species with different aperture patterns (two monocots, Phormium tenax and Asphodelus albus, and two eudicots, Helleborus foetidus and Protea lepidocarpodendron). The way in which post-meiotic cytokinesis is performed differs between all four species, and variation in callose deposition appears to be linked to aperture pattern definition.

Key Words: aperture pattern ontogeny • callose • cytokinesis • eudicot • meiosis, monocot • pollen

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