During the evolution the benthic macrophytic algae developed effective mechanisms of bioadhesion enabling their attachment to almost any surface in the aqueous medium. The attachment of algal spores and zygotes includes two successive stages: the primary and the secondary (final) adhesion. Analysis of information on the composition of adhesive materials and attachment mechanisms in brown, green, and red marine macrophytes indicates that synthesis and release of adhesive substances by algal cells can be considered as a temporary intensification of cell wall synthesis. The structure of the primary adhesive material comprises a gel phase (alginate, ulvan, and agar gels) and a structuring component, i.e., a flexible network based on branched chains and/or rings of phenolic compounds, polysaccharides, or glycoproteins. Irreversible hardening of the primary adhesive material arises from phenol polymerization catalyzed by different peroxidases (brown algae) or from polymerization of glycoproteins comprising amino acids with phenolic residues (red algae). In parallel with these processes, covalent cross-links are being formed between the adhesive structural components and the gel phase polysaccharides. This results in the formation of the secondary adhesive and in eventual attachment of the organism to the substrate. The attachment mechanisms of benthic algae appear to have some features in common with the mechanisms of bioadhesion of marine invertebrates.
Russian Journal of Plant Physiology – Springer Journals
Published: Dec 28, 2013
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