AOBPreview originally published online on November 26, 2004
Annals of Botany 2005 95(2):331-343; doi:10.1093/aob/mci030
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Annals of Botany 95/2 © Annals of Botany Company 2004; all rights reserved
Multiple Developmental Pathways Leading to a Single Morph: Monosulcate Pollen (Examples From the Asparagales)
1 Laboratoire Ecologie, Systématique et Evolution, Bâtiment 360, Université Paris-Sud, 91405 Orsay cédex, France, 2 UMR de Génétique Végétale, INRA/Univ. Paris XI/CNRS/INA PG, Ferme du Moulon, 91190 Gif-sur-Yvette, France and 3 Botany Department, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
* For correspondence. E-mail Laurent.Penet{at}ese.u-psud.fr
Received: 23 June 2004 Returned for revision: 12 August 2004 Accepted: 26 September 2004 Published electronically: 26 November 2004
• Background and Aims Early developmental events in microsporogenesis are known to play a role in pollen morphology: variation in cytokinesis type, cell wall formation, tetrad shape and aperture polarity are responsible for pollen aperture patterning. Despite the existence of other morphologies, monosulcate pollen is one of the most common aperture types in monocots, and is also considered as the ancestral condition in this group. It is known to occur from either a successive or a simultaneous cytokinesis. In the present study, the developmental sequence of microsporogenesis is investigated in several species of Asparagales that produce such monosulcate pollen, representing most families of this important monocot clade.
• Methods The developmental pathway of microsporogenesis was investigated using light transmission and epifluorescence microscopy for all species studied. Confocal microscopy was used to confirm centripetal cell plate formation.
• Key Results Microsporogenesis is diverse in Asparagales, and most variation is generally found between families. It is confirmed that the whole higher Asparagales clade has a very conserved microsporogenesis, with a successive cytokinesis and centrifugal cell plate formation. Centripetal cell wall formation is described in Tecophilaeaceae and Iridaceae, a feature that had so far only been reported for eudicots.
• Conclusions Monosulcate pollen can be obtained from several developmental pathways, leading thus to homoplasy in the monosulcate character state. Monosulcate pollen should not therefore be considered as the ancestral state unless it is produced through the ancestral developmental pathway. The question about the ancestral developmental pathway leading to monosulcy remains open.
Key words: Aperture pattern, Asparagales, cell wall formation, development, microsporogenesis, monosulcate pollen
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