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Microsporogenesis in Amelanchier alnifolia: sporogenous cells, microsporocytes, and tetrads.
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- Author(s): Sumner, Michael J.; Remphrey, William R.
- Source:
Canadian Journal of Botany; Sep2005, Vol. 83 Issue 9, p1106-1116, 10p, 1 Color Photograph, 3 Black and White Photographs, 1 Chart- Subject Terms:
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- Abstract: As part of an overall program aimed at increasing our knowledge of the male reproductive system of Amelanchier alnifolia Nutt., this study documents structural and developmental changes that occur in the sporogenous cells, microsporocytes, and tetrads of microspores during microsporogenesis using general cytochemical techniques in conjunction with bright field, fluorescence, and transmission electron microscopy. The sporogenous cells are thin walled and stain positively for β-1,4-glucans, pectic acids, and cellulose, but not callose. At the microsporocyte and tetrad stages of microsporogenesis, thick walls develop and stain positively for β-1,4-glucans (hemicelluloses but not cellulose), pectic acids, and callose. Thus, the eventual release of maturing microspores from the tetrads requires the digestion of all three of these carbohydrate wall materials. Postmeiotic cytokinesis is of the simultaneous type and is initiated when Golgi vesicles aggregate simultaneously into a network of cylindrical tubules in both central and peripheral cell locations of the coenocytic tetrad. Eventually, this network fuses to form the new cell walls within the microspore tetrad. [ABSTRACT FROM AUTHOR]
- Abstract: Cette contribution s’insère dans un programme d’ensemble visant à augmenter les connaissances du système reproducteur mâle de l’Amelanchier alnifolia Nutt. L’objectif de l’étude est d’observer les modifications des structures et du développement qui surviennent chez les cellules sporogènes, les microsporocytes et les tétrades de microspores, au cours de la microsporogénèse, en utilisant des techniques cytochimiques générales, avec la microscopie sur fond clair, en fluorescence et électronique par transmission. Les cellules sporogènes ont de minces parois et la coloration révèle des β-1,4-glucans, des acides pectiques et de la cellulose, mais pas de callose. Aux stades microsporocyste et tétrade de la microsporogénèse, des parois épaisses se développent où la coloration révèle la présence de β-1,4-glucans (hémicellulose, mais pas de cellulose) et des acides pectiques ainsi que de la callose. Conséquemment, le relâchement éventuel des microspores de la tétrade en maturation nécessite la digestion de l’ensemble de ces trois matériaux glucidiques pariétaux. La cytocinèse post-méiotique de type simultané est initiée lorsque les vésicules de l‘appareil de Golgi se regroupent en un réseau de tubules cylindriques simultanément aux localisations des cellules centrales et périphériques de la tétrade cénocytique. Éventuellement, ce réseau se fusionne pour former les nouvelles parois cellulaires, à l’intérieur de la tétrade de microspores. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Canadian Journal of Botany is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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