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The life cycle of the amoeboid alga Synchroma grande (Synchromophyceae, Heterokontophyta)--highly adapted yet equally equipped for rapid diversification in benthic habitats

The life cycle of the amoeboid alga Synchroma grande (Synchromophyceae, Heterokontophyta)--highly adapted yet equally equipped for rapid diversification in benthic habitats

Plant Biology 13(5): 801-808

ISSN/ISBN: 1435-8603

PMID: 21815985

DOI: 10.1111/j.1438-8677.2010.00427.x

Synchroma grande (Synchromophyceae, Heterokontophyta) is a marine amoeboid alga, which was isolated from a benthic habitat. This species has sessile cell stages (amoeboid cells with lorica and cysts) and non-sessile cell stages (migrating and floating amoebae) during its life cycle. The different cell types and their transitions within the life cycle are described, as are their putative functions. Cell proliferation was observed only in cells attached to the substrate but not in free-floating or migrating cells. We also characterised the phagotrophy of the meroplasmodium in comparison to other amoeboid algae and the formation of the lorica. The functional adaptations of S. grande during its life cycle were compared to the cell stages of other amoeboid algae of the red and green chloroplast lineages. S. grande was found to be highly adapted to the benthic habitat. One sexual and two asexual reproductive strategies (haplo-diploid life cycle) support the ability of this species to achieve rapid diversification and high adaptivity in its natural habitat.

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Accession: 056395753

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