ArticleScientific reports2021
Characterization of a green Stentor with symbiotic algae growing in an extremely oligotrophic environment and storing large amounts of starch granules in its cytoplasm.
Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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13 citing papers in PubMed.
- Article
- Stentor stipatus is a new unicellular species that demonstrates habituation and unique phototaxis.Scientific reports · 2026Article
- Water freeze-drying for high-resolution SEM: an accessible strategy for capturing native microorganism morphology without dedicated rapid-freezing systems.Frontiers in microbiology · 2026Article
- Artifact-free preparation of biological samples for SEM by optimized water freeze-drying.Scientific reports · 2025Article
- Physiology and metabolism of eukaryotic microalgae involved in aquatic photosymbioses.The New phytologist · 2025Review
- The cell biology and genome ofMolecular biology of the cell · 2025Article
- Genomic Signatures of Adaptation to Stress Reveal Shared Evolutionary Trends Between Tetrahymena utriculariae and Its Algal Endosymbiont, Micractinium tetrahymenae.Molecular biology and evolution · 2025Article
- Environment-dependent mutualism-parasitism transitions in the incipient symbiosis between Tetrahymena utriculariae and Micractinium tetrahymenae.The ISME journal · 2025Article
- Species delimitation in the genusPhytoKeys · 2025Article
- The genus Coelastrella (Chlorophyceae, Chlorophyta): molecular species delimitation, biotechnological potential, and description of a new species Coelastrella affinis sp. nov., based on an integrative taxonomic approach.Antonie van Leeuwenhoek · 2024Article
- Phylogeny, morphology, and behavior of the new ciliate speciesbioRxiv : the preprint server for biology · 2024Article
- Cellular interactions and evolutionary origins of endosymbiotic relationships with ciliates.The ISME journal · 2024Review
- Article
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4 authors.
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Abstract
The genus Stentor is a relatively well-known ciliate owing to its lucid trumpet shape. Stentor pyriformis represents a green, short, and fat Stentor, but it is a little-known species. We investigated 124 ponds and wetlands in Japan and confirmed the presence of S. pyriformis at 23 locations. All these ponds were noticeably oligotrophic. With the improvement of oligotrophic culture conditions, we succeeded in long-term cultivation of three strains of S. pyriformis. The cytoplasm of S. piriformis contains a large number of 1-3 μm refractive granules that turn brown by Lugol's staining. The granules also show a typical Maltese-cross pattern by polarization microscopy, strongly suggesting that the granules are made of amylopectin-rich starch. By analyzing the algal rDNA, it was found that all S. pyriformis symbionts investigated in this study were Chlorella variabilis. This species is known as the symbiont of Paramecium bursaria and is physiologically specialized for endosymbiosis. Genetic discrepancies between C. variabilis of S. pyriformis and P. bursaria may indicate that algal sharing was an old incident. Having symbiotic algae and storing carbohydrate granules in the cytoplasm is considered a powerful strategy for this ciliate to withstand oligotrophic and cold winter environments in highland bogs.
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