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Abstract:

The articulated coralline Calliarthron cheilosporioides Manza produces segmented fronds composed of calcified segments (intergenicula) separated by uncalcified joints (genicula), which allow fronds to bend and reorient under breaking waves in the wave-swept intertidal zone. Genicula are formed when calcified cells decalcify and restructure to create flexible tissue. The present study has identified important differences in the main agaran disaccharidic repeating units [→3)-β- d-Gal. p (1→ 4)-α- l-Gal. p(1→] synthesized by genicular and intergenicular segments. Based on chemical and spectroscopical analyses, we report that genicular cells from C. cheilosporioides biosynthesize a highly methoxylated galactan at C-6 position with low levels of branching with xylose side stubs on C-6 of the [→3)-β- d-Gal. p (1→] units, whereas intergenicular segments produce xylogalactans with high levels of xylose and low levels of 6- O-methyl β- d-Gal units. These data suggest that, during genicular development, xylosyl branched, 3-linked β- d-Gal. p units present in the xylogalactan backbones from intergenicular walls are mostly replaced by 6- O-methyl. -d-galactose units. We speculate that this structural shift is a consequence of a putative and specific methoxyl transferase that blocks the xylosylation on C-6 of the 3-linked β- d-Gal. p units. Changes in galactan substitutions may contribute to the distinct mechanical properties of genicula and may lend insight into the calcification process in coralline algae. © 2010 Phycological Society of America.

Registro:

Documento: Artículo
Título:Differences in polysaccharide structure between calcified and uncalcified segments in the coralline calliarthron cheilosporioides (corallinales, rhodophyta)
Autor:Martone, P.T.; Navarro, D.A.; Stortz, C.A.; Estevez, J.M.
Filiación:Hopkins Marine Station of Stanford University, Pacific Grove, CA 93950, United States
Departamento de Química Orgánica (CIHIDECAR-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria - Pabellón 2, 1428 Buenos Aires, Argentina
Laboratorio de Fisiología y Biología Molecular (IFIByNE-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, Buenos Aires C1428EGA, Argentina
Department of Botany, University of British Columbia, Vancouver, BC, Canada
Palabras clave:Agarans; Calliarthron cheilosporioides; Cell wall; Coralline algae; Galactans; Genicula; Intergenicula; Red seaweed; algae; Calliarthron cheilosporioides; Corallinales; Genicula; Rhodophyta
Año:2010
Volumen:46
Número:3
Página de inicio:507
Página de fin:515
DOI: http://dx.doi.org/10.1111/j.1529-8817.2010.00828.x
Título revista:Journal of Phycology
Título revista abreviado:J. Phycol.
ISSN:00223646
CODEN:JPYLA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223646_v46_n3_p507_Martone

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Citas:

---------- APA ----------
Martone, P.T., Navarro, D.A., Stortz, C.A. & Estevez, J.M. (2010) . Differences in polysaccharide structure between calcified and uncalcified segments in the coralline calliarthron cheilosporioides (corallinales, rhodophyta). Journal of Phycology, 46(3), 507-515.
http://dx.doi.org/10.1111/j.1529-8817.2010.00828.x
---------- CHICAGO ----------
Martone, P.T., Navarro, D.A., Stortz, C.A., Estevez, J.M. "Differences in polysaccharide structure between calcified and uncalcified segments in the coralline calliarthron cheilosporioides (corallinales, rhodophyta)" . Journal of Phycology 46, no. 3 (2010) : 507-515.
http://dx.doi.org/10.1111/j.1529-8817.2010.00828.x
---------- MLA ----------
Martone, P.T., Navarro, D.A., Stortz, C.A., Estevez, J.M. "Differences in polysaccharide structure between calcified and uncalcified segments in the coralline calliarthron cheilosporioides (corallinales, rhodophyta)" . Journal of Phycology, vol. 46, no. 3, 2010, pp. 507-515.
http://dx.doi.org/10.1111/j.1529-8817.2010.00828.x
---------- VANCOUVER ----------
Martone, P.T., Navarro, D.A., Stortz, C.A., Estevez, J.M. Differences in polysaccharide structure between calcified and uncalcified segments in the coralline calliarthron cheilosporioides (corallinales, rhodophyta). J. Phycol. 2010;46(3):507-515.
http://dx.doi.org/10.1111/j.1529-8817.2010.00828.x