Raphidophyceae (Raphidophyta)

Horiguchi, Takeo

doi:10.1007/978-3-319-28149-0_37

Cited by 5 publications

(1 citation statement)

References 91 publications

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“…Raphidophyceae is a small group of microalgae that includes widely distributed marine and freshwater representatives (Horiguchi ). Taxonomic identification of raphidophytes based only on morphological traits is frequently difficult because cells are usually very sensitive, easily losing their original shape during fixation (Throndsen ; Hargraves & Maranda ).…”

Section: Introductionmentioning

confidence: 99%

Morphological and genetic characterization of bloom‐forming Raphidophyceae from Brazilian coast

Branco

Almeida

Alves‐de‐Souza

et al. 2019

Phycological Research

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SUMMARY Massive fish kills caused by bloom‐forming species of the Raphidophyceae occur in many marine coastal areas and often cause significant economic losses. The ultrastructure and phylogeny of marine raphidophytes from the Brazilian coast have not been fully analyzed. Here, we present the first combined morphological and genetic characterization of raphidophyte strains from the Brazilian coast. Ten strains of four raphidophyte species (Chattonella subsalsa, C. antiqua, Heterosigma akashiwo, and Fibrocapsa japonica) were characterized based on morphology (including ultrastructure) and LSU rDNA sequences. Chattonella subsalsa and C. antiqua formed two distinct genetic clades. We found that the cell size is the only phenotypic feature separating C. subsalsa and C. antiqua strains from Brazil, whereas traditional characteristics used for species separation in the genus Chattonella (i.e., tail size, chloroplast presence in the tail, ‘oboe‐shaped’ mucocysts, and presence of thylakoids in the pyrenoid matrix) were not sufficiently discriminative, due to their overlapping in the two taxa. The phylogenetic analysis indicated intra‐specific geographic differences among C. subsalsa sequences, with two subclades: one formed by isolates from Brazil, USA, and Iran, and another by a sequence from the Adriatic Sea (Italy). Fibrocapsa japonica also showed intra‐specific geographic differences, with a sequence from a Brazilian strain grouped with strains from Japan, Australia, and Germany, all of them distinct from the Italian isolates. This is the first combined morphological and phylogenetic analysis of raphidophytes from the South Atlantic. Our findings broaden knowledge of the biodiversity of this important bloom‐forming algal group.

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Section: Introductionmentioning

confidence: 99%

Morphological and genetic characterization of bloom‐forming Raphidophyceae from Brazilian coast

Branco

Almeida

Alves‐de‐Souza

et al. 2019

Phycological Research

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Algae from Secondary Endosymbiosis

Friedl

2024

Biology of Algae, Lichens and Bryophytes

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Life cycle strategies in free‐living unicellular eukaryotes: Diversity, evolution, and current molecular tools to unravel the private life of microorganisms

Rizos,

Frada,

Bittner

et al. 2024

J Eukaryotic Microbiology

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An astonishing range of morphologies and life strategies has arisen across the vast diversity of protists, allowing them to thrive in most environments. In model protists, like Tetrahymena, Dictyostelium, or Trypanosoma, life cycles involving multiple life stages with different morphologies have been well characterized. In contrast, knowledge of the life cycles of free‐living protists, which primarily consist of uncultivated environmental lineages, remains largely fragmentary. Various life stages and lineage‐specific cellular innovations have been observed in the field for uncultivated protists, but such innovations generally lack functional characterization and have unknown physiological and ecological roles. In the actual state of knowledge, evidence of sexual processes is confirmed for 20% of free‐living protist lineages. Nevertheless, at the onset of eukaryotic diversification, common molecular trends emerged to promote genetic recombination, establishing sex as an inherent feature of protists. Here, we review protist life cycles from the viewpoint of life cycle transitions and genetics across major eukaryotic lineages. We focus on the scarcely observed sexual cycle of free‐living protists, summarizing evidence for its existence and describing key genes governing its progression, as well as, current methods for studying the genetics of sexual cycles in both cultivable and uncultivated protist groups.

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Raphidophyceae (Raphidophyta)

Cited by 5 publications

References 91 publications

Morphological and genetic characterization of bloom‐forming Raphidophyceae from Brazilian coast

Morphological and genetic characterization of bloom‐forming Raphidophyceae from Brazilian coast

Algae from Secondary Endosymbiosis

Life cycle strategies in free‐living unicellular eukaryotes: Diversity, evolution, and current molecular tools to unravel the private life of microorganisms

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