Abstract
Diatoms, a class of heterokont algae, are among the most important primary producers. They may live attached to the ground as part of the benthos or buoyant in the oceans, in brackish water and in freshwater habitats. Their ability to stay in the water column as well as their propensity to adhere to structures is a result of secretion, even locomotary activity of pennate diatoms is a consequence of secretion. Diatoms make a cell wall of glass-like silicate. This feature, which sets diatoms apart from most other algae, also entails secretory activity. Secretion in diatoms has been studied by biochemical and immunological means, by histochemistry, light and electron microscopy and by physical methods. Recently, the genomes of two diatom species, one of the order Centrales and the other of the order Pennales, have been sequenced and transformation techniques have become available for the establishment of transgenic lines in some species. This has given diatom research an additional push forward, so that not surprisingly, tremendous progress has been made, particularly in the field of silica polycondensation and frustule morphogenesis. In trying to bring together classical biochemical, cell biological and structural work with modern molecular studies, the role of secretory processes in the diatoms is illuminated with particular emphasis on cell wall morphogenesis and locomotion.
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Aumeier, C., Menzel, D. (2012). Secretion in the Diatoms. In: Vivanco, J., Baluška, F. (eds) Secretions and Exudates in Biological Systems. Signaling and Communication in Plants, vol 12. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-23047-9_10
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