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<title lang=en>Thioautotrophic ectosymbiosis in Pseudovorticella sp., a peritrich ciliate species colonizing wood falls in marine mangrove</title>
<creator>Grimonprez, Adrien</creator>
<creator>Molza, Audrey</creator>
<creator>Laurent, Mélina C.Z</creator>
<creator>Mansot, Jean-Louis</creator>
<creator>Gros, Olivier</creator>
<contributor>Biologie de la Mangrove (BM) ; Systématique, adaptation, évolution (SAE) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS) - Evolution Paris Seine ; Université des Antilles et de la Guyane (UAG) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA)</contributor>
<contributor>Groupe de Technologie des Surfaces et Interfaces (GTSI) ; Université des Antilles et de la Guyane (UAG) - Université des Antilles (Pôle Guadeloupe) ; Université des Antilles (UA) - Université des Antilles (UA)</contributor>
<contributor>Centre Commun de Caractérisation des Matériaux des Antilles et de la Guyane (C3MAG) ; Université des Antilles et de la Guyane (UAG)</contributor>
<description>International audience</description>
<source>ISSN: 0932-4739</source>
<source>European Journal of Protistology</source>
<publisher>Elsevier</publisher>
<identifier>hal-01655933</identifier>
<identifier>http://hal.upmc.fr/hal-01655933</identifier>
<identifier>http://hal.upmc.fr/hal-01655933/document</identifier>
<identifier>http://hal.upmc.fr/hal-01655933/file/GRIMONPREZ_Adrien_sans%20marque.pdf</identifier>
<source>http://hal.upmc.fr/hal-01655933</source>
<source>European Journal of Protistology, Elsevier, 2018, 62, pp.43-55. 〈10.1016/j.ejop.2017.11.002〉</source>
<identifier>DOI : 10.1016/j.ejop.2017.11.002</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ejop.2017.11.002</relation>
<language>en</language>
<subject lang=en>Protist</subject>
<subject lang=en>Raman</subject>
<subject lang=en>Sulfidic environment</subject>
<subject lang=en>Symbiosis</subject>
<subject lang=en>Ultrastructural analysis</subject>
<subject>[SDV.MP.PRO] Life Sciences [q-bio]/Microbiology and Parasitology/Protistology</subject>
<subject>[SDV.EE.IEO] Life Sciences [q-bio]/Ecology, environment/Symbiosis</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Ciliates represent a diversified group of protists known to establish symbioses with prokaryotic microorganisms. They are mainly phagotrophs and symbiotic relationships with bacteria can give them an important advantage in chemosynthetic environments. The aim of this study is to describe the thiotrophic association that occurs between the peritrich ciliate Pseudovorticella sp. and potential sulfur-oxidizing bacteria. Investigations at microscopic scale (LM, SEM, TEM) showed ectosymbiotic bacteria covering the surface of the body of Pseudovorticella sp. According to 16S rDNA phylogenetic analysis, these ectosymbiotic bacteria belong to-proteobacteria and are phylogenetically close to the symbiont of the recently described Zoothamnium ignavum, which inhabits shallow-water wood falls. FISH experiments, using symbiont specific probes, clearly indicate that these ectosymbiotic bacteria are also ingested into food vacuoles. Electron lucent granules observed in TEM in the cytoplasm of the ectosymbiotic bacteria have been identified as sulfur granules by Raman microspectrometry analyses. Raman microspec-trometry analyses confirmed the thiotrophic nature of this relationship already suggested by the results obtained by TEM and phylogeny. A complete sulfur map was then performed to investigate the sulfur distribution in the zooid. Results show that the relationship between this protist and its bacterial partner is a thiotrophic ectosymbiosis.</description>
<date>2018-02</date>
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