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Abstract:

• Background and Aims: Although orbicular functions are still a matter of debate, they are considered by most authors to be exclusively formed by a secretory tapetum. However, the presence of orbicules on a peritapetal membrane associated with a plasmodial tapetum has been described for Abutilon pictum (Malvaceae) in a previous study. Thus, studies on other species of Malvaceae are necessary to corroborate the presence of such bodies in other members of the family. Pollen and microsporangium development of Modiolastrum malvifolium has been studied in this work. • Methods: Anthers at different stages of development were processed for transmission electron microscopy and light microscopy. Membranes and pollen walls resistant to acetolysis were isolated from whole anthers. • Key Results: Microspore tetrads have a tetrahedral arrangement. Pollen grains are shed at the bicellular stage. The tapetum is invasive, non-syncytial and a peritapetal membrane with orbicules is formed. • Conclusions: This is the first report of the presence of orbicules on a peritapetal membrane in a species with a tapetum of an invasive, non-syncytial type. Taking into consideration all the information on the subject, it can be concluded that the presence of orbicules is not a stable criterion to differentiate between a secretory or plasmodial, or intermediate invasive, non-syncytial tapetum. © The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved.

Registro:

Documento: Artículo
Título:Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae)
Autor:Galati, B.G.; Monacci, F.; Gotelli, M.M.; Rosenfeldt, S.
Filiación:Depto. Biodiversidad Y Biología Experimental, Facultad de Ciencias Exactas Y Naturales, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
Palabras clave:Invasive non-syncytial tapetum; Modiolastrum malvifolium; Orbicules; Peritapetal membrane; angiosperm; cytoplasm; developmental stage; invasive species; pollen; spore; Abutilon pictum; Magnoliophyta; Malvaceae; Modiolastrum; angiosperm; article; growth, development and aging; histology; pollen; transmission electron microscopy; ultrastructure; Malvaceae; Microscopy, Electron, Transmission; Pollen
Año:2007
Volumen:99
Número:4
Página de inicio:755
Página de fin:763
DOI: http://dx.doi.org/10.1093/aob/mcm011
Título revista:Annals of Botany
Título revista abreviado:Ann. Bot.
ISSN:03057364
CODEN:ANBOA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_03057364_v99_n4_p755_Galati.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03057364_v99_n4_p755_Galati

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Citas:

---------- APA ----------
Galati, B.G., Monacci, F., Gotelli, M.M. & Rosenfeldt, S. (2007) . Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae). Annals of Botany, 99(4), 755-763.
http://dx.doi.org/10.1093/aob/mcm011
---------- CHICAGO ----------
Galati, B.G., Monacci, F., Gotelli, M.M., Rosenfeldt, S. "Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae)" . Annals of Botany 99, no. 4 (2007) : 755-763.
http://dx.doi.org/10.1093/aob/mcm011
---------- MLA ----------
Galati, B.G., Monacci, F., Gotelli, M.M., Rosenfeldt, S. "Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae)" . Annals of Botany, vol. 99, no. 4, 2007, pp. 755-763.
http://dx.doi.org/10.1093/aob/mcm011
---------- VANCOUVER ----------
Galati, B.G., Monacci, F., Gotelli, M.M., Rosenfeldt, S. Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae). Ann. Bot. 2007;99(4):755-763.
http://dx.doi.org/10.1093/aob/mcm011