Document Detail


The mechanism of adhesion and germination in the carpospores of Porphyra spiralis var. amplifolia (Rhodophyta, Bangiales).
MedLine Citation:
PMID:  21930389     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Spore release is the primary means of dispersion employed by red algae, and it provides insight into the elements linking the stages of their life history. In most red algae, spores are released within a sheath-like envelope of mucilage, which is responsible for their primary attachment. However, few studies have characterized the polysaccharides involved in the adhesion of seaweed spores. Therefore, in this paper, the process of spore germination and adhesion in Porphyra spiralis var. amplifolia is described, as representative of the germination pattern of the Naccaria type. Using FITC-labeled lectins, we discovered high concentrations of α-d-mannose, α-d-glucose and β-d-galactose in the mucilage. The germ tube reacted with RCA-FITC, indicating the presence β-d-galactose, and the rhizoidal cells showed the presence of α-d-mannose, α-d-glucose and β-d-galactose, indicating their importance to substrate adhesion. Using light and transmission electron microscopy, we also conducted an analysis of spore ultrastructure. We found that the differentiation of a vacuole in the spore is one of the most important processes marking the initial stage of germination. Thus, as the degree of vacuolation increases, whole cell contents move towards the germ tube, which undergoes several successive divisions forming the sporophytic phase. Therefore, we can conclude that germination in Porphyra spiralis var. amplifolia is characterized by (1) the fixation of carpospores in the substrate by sugars present in the mucilage and (2) the polarization of cell contents by the processes of vacuolization and germ tube formation.
Authors:
Luciane Cristina Ouriques; Eder Carlos Schmidt; Zenilda Laurita Bouzon
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-6
Journal Detail:
Title:  Micron (Oxford, England : 1993)     Volume:  -     ISSN:  1878-4291     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9312850     Medline TA:  Micron     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Affiliation:
Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina 88049-900, CP 476, Florianópolis, SC, Brazil.
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