@article {Cai2020, title = {Cryptic species in the parasitic Amoebophrya species complex revealed by a polyphasic approach}, journal = {Scientific Reports}, volume = {10}, number = {1}, year = {2020}, note = {Publisher: Springer US tex.mendeley-tags: RCC1627,RCC1720,RCC3018,RCC3043,RCC3044,RCC3047,RCC3048,RCC3049,RCC3145,RCC3278,RCC3596,RCC4381,RCC4382,RCC4383,RCC4384,RCC4385,RCC4386,RCC4387,RCC4388,RCC4389,RCC4390,RCC4391,RCC4392,RCC4393,RCC4394,RCC4395,RCC4396,RCC4397,RCC4398,RCC4399,RCC4400,RCC4401,RCC4402,RCC4403,RCC4404,RCC4405,RCC4406,RCC4407,RCC4408,RCC4409,RCC4410,RCC4411,RCC4412,RCC4413,RCC4414,RCC4415,RCC4416,RCC4711,RCC4712,RCC4713,RCC4715,RCC4716,RCC4722,RCC4723,RCC4726,RCC4728,RCC4729,RCC4732,RCC4733,RCC4734,RCC5984,RCC5985,RCC5986,RCC5987,RCC5988,RCC5989,RCC5990,RCC5991,RCC5992,RCC5993,RCC5994,RCC5995,RCC5997,RCC5998,RCC5999,RCC6000,RCC6001,RCC6002,RCC6003,RCC6004,RCC6005,RCC6006,RCC6007,RCC6008,RCC6009,RCC6010,RCC6079,RCC6080,RCC6081,RCC6082,RCC6083,RCC6084,RCC6085,RCC6087,RCC6088,RCC6094,RCC6096,RCC6100,RCC6101,RCC6102,RCC6103,RCC6104,RCC6105,RCC6106,RCC6107,RCC6108,RCC6109,RCC6110,RCC6111,RCC6112,RCC6113,RCC6115,RCC6116,RCC6117,RCC6118,RCC6119,RCC6120,RCC6121}, month = {dec}, pages = {2531}, keywords = {RCC1627, RCC1720, RCC3018, RCC3043, RCC3044, RCC3047, RCC3048, RCC3049, RCC3145, RCC3278, RCC3596, RCC4381, RCC4382, RCC4383, RCC4384, RCC4385, RCC4386, RCC4387, RCC4388, RCC4389, RCC4390, RCC4391, RCC4392, RCC4393, RCC4394, RCC4395, RCC4396, RCC4397, RCC4398, RCC4399, RCC4400, RCC4401, RCC4402, RCC4403, RCC4404, RCC4405, RCC4406, RCC4407, RCC4408, RCC4409, RCC4410, RCC4411, RCC4412, RCC4413, RCC4414, RCC4415, RCC4416, RCC4711, RCC4712, RCC4713, RCC4715, RCC4716, RCC4722, RCC4723, RCC4726, RCC4728, RCC4729, RCC4732, RCC4733, RCC4734, RCC5984, RCC5985, RCC5986, RCC5987, RCC5988, RCC5989, RCC5990, RCC5991, RCC5992, RCC5993, RCC5994, RCC5995, RCC5997, RCC5998, RCC5999, RCC6000, RCC6001, RCC6002, RCC6003, RCC6004, RCC6005, RCC6006, RCC6007, RCC6008, RCC6009, RCC6010, RCC6079, RCC6080, RCC6081, RCC6082, RCC6083, RCC6084, RCC6085, RCC6087, RCC6088, RCC6094, RCC6096, RCC6100, RCC6101, RCC6102, RCC6103, RCC6104, RCC6105, RCC6106, RCC6107, RCC6108, RCC6109, RCC6110, RCC6111, RCC6112, RCC6113, RCC6115, RCC6116, RCC6117, RCC6118, RCC6119, RCC6120, RCC6121}, issn = {2045-2322}, doi = {10.1038/s41598-020-59524-z}, url = {http://dx.doi.org/10.1038/s41598-020-59524-z http://www.nature.com/articles/s41598-020-59524-z}, author = {Cai, Ruibo and Kayal, Ehsan and Alves-de-Souza, Catharina and Bigeard, Estelle and Corre, Erwan and Jeanthon, Christian and Marie, Dominique and Porcel, Betina M and Siano, Raffaele and Szymczak, Jeremy and Wolf, Matthias and Guillou, Laure} } @article {Crenn2018, title = {Bacterial epibiotic communities of ubiquitous and abundant marine diatoms are distinct in short- and long-term associations}, journal = {Frontiers in Microbiology}, volume = {9}, number = {December}, year = {2018}, note = {tex.mendeley-tags: 2018,RCC2560,RCC2565,rcc}, pages = {1{\textendash}12}, abstract = {Interactions between phytoplankton and bacteria play a central role in mediatingbiogeochemical cycling and food web structure in the ocean. The cosmopolitan diatomsThalassiosiraandChaetocerosoften dominate phytoplankton communities in marinesystems. Past studies of diatom-bacterial associations have employed community-level methods and culture-based or natural diatom populations. Although bacterialassemblages attached to individual diatoms represents tight associations little is knownon their makeup or interactions. Here, we examined the epibiotic bacteria of 436Thalassiosiraand 329Chaetocerossingle cells isolated from natural samples andcollection cultures, regarded here as short- and long-term associations, respectively.Epibiotic microbiota of single diatom hosts was analyzed by cultivation and by cloning-sequencing of 16S rRNA genes obtained from whole-genome amplification products.The prevalence of epibiotic bacteria was higher in cultures and dependent of the hostspecies. Culture approaches demonstrated that both diatoms carry distinct bacterialcommunities in short- and long-term associations. Bacterial epibonts, commonlyassociated with phytoplankton, were repeatedly isolated from cells of diatom collectioncultures but were not recovered from environmental cells. Our results suggest thatin controlled laboratory culture conditions bacterial{\textendash}diatom and bacterial{\textendash}bacterialinteractions select for a simplified, but specific, epibiotic microbiota shaped and adaptedfor long-term associations.}, keywords = {2018, Chaetoceros, diatoms, diversity, heterotrophic bacteria, interactions, microbiome, rcc, RCC2560, RCC2565, Thalassiosira, Western English Channel}, issn = {1664-302X}, doi = {10.3389/fmicb.2018.02879}, url = {https://www.frontiersin.org/article/10.3389/fmicb.2018.02879/full}, author = {Crenn, Klervi and Duffieux, Delphine and Jeanthon, Christian} } @article {Zheng2016, title = {The geographic impact on genomic divergence as revealed by comparison of nine Citromicrobial genomes}, journal = {Applied and Environmental Microbiology}, volume = {82}, number = {24}, year = {2016}, note = {tex.mendeley-tags: 2016,RCC1878,RCC1885,RCC1897,sbr?hyto?app}, pages = {AEM.02495{\textendash}16}, abstract = {Aerobic anoxygenic phototrophic bacteria (AAPB) are thought to be important players in oceanic carbon and energy cycling in the euphotic zone of the ocean. The genus Citromicrobium , widely found in oligotrophic oceans, is a member of marine alphaproteobacterial AAPB. Nine Citromicrobium strains isolated from the South China Sea, the Mediterranean Sea or the tropical South Atlantic were found to harbor identical 16S rRNA sequences. The sequencing of their genomes revealed high synteny in major regions. Nine genetic islands (GIs), involved mainly in type IV secretion systems, flagellar biosynthesis, prophage and integrative conjugative elements, were identified by a fine scale comparative genomics analysis. These GIs played significant roles in genomic evolution and divergence. Interestingly, the co-existence of two different photosynthetic gene clusters (PGCs) was not only found in the analyzed genomes but also confirmed, for the first time, in environmental samples. The prevalence of the coexistence of two different PGCs may suggest an adaptation mechanism for Citromicrobium members to survive in the oceans. Comparison of genomic characteristics (e.g., GIs, ANI, SNPs and phylogeny) revealed that strains within a marine region shared a similar evolutionary history that was distinct from that of strains isolated from other regions (South China Sea vs Mediterranean Sea). Geographic differences are partly responsible for driving the observed genomic divergences, and allow microbes to evolve through local adaptation. Three Citromicrobium strains isolated from the Mediterranean Sea diverged millions of years ago from other strains, and evolved into a novel group.}, keywords = {2016, RCC1878, RCC1885, RCC1897, sbr?hyto?app}, issn = {0099-2240}, doi = {10.1128/AEM.02495-16}, url = {http://aem.asm.org/lookup/doi/10.1128/AEM.02495-16}, author = {Zheng, Qiang and Liu, Yanting and Jeanthon, Christian and Zhang, Rui and Lin, Wenxin and Yao, Jicheng and Jiao, Nianzhi} } @article {Amiraux2016, title = {Paradoxical effects of temperature and solar irradiance on the photodegradation state of killed phytoplankton}, journal = {Journal of Phycology}, volume = {52}, number = {3}, year = {2016}, note = {tex.mendeley-tags: 2016,rcc2022}, month = {jun}, pages = {475{\textendash}485}, abstract = {The aim of this paper was to study the effects of temperature and irradiance on the photodegradation state of killed phytoplankton cells. For this purpose, killed cells of the diatom Chaetoceros neogracilis RCC2022 were irradiated (PAR radiations) at 36 and 446 J. s(-1.) m(-2) (for a same cumulative dose of irradiation energy) and at two temperatures (7 and 17{\textdegree}C). Analyses of specific lipid tracers (fatty acids and sterols) revealed that low temperatures and irradiances increased photooxidative damages of monounsaturated lipids (i.e. palmitoleic acid, cholesterol and campesterol). The high efficiency of type II photosensitized degradation processes was attributed to: (i) the relative preservation of the sensitizer (chlorophyll) at low irradiances allowing a longer production of singlet oxygen and (ii) the slow diffusion rate of singlet oxygen through membranes at low temperatures inducing more damages. Conversely, high temperatures and irradiances induced (i) a rapid degradation of the photosensitizer and a loss of singlet oxygen by diffusion outside the membranes (limiting type II photosensitized oxidation), and (ii) intense autoxidation processes degrading unsaturated cell lipids and oxidation products used as photodegradation tracers. Our results may likely explain the paradoxical relationship observed in situ between latitude and photodegradation state of phytoplankton cells. This article is protected by copyright. All rights reserved.}, keywords = {2016, rcc2022}, issn = {00223646}, doi = {10.1111/jpy.12410}, url = {http://www.ncbi.nlm.nih.gov/pubmed/26992328 http://doi.wiley.com/10.1111/jpy.12410}, author = {Amiraux, Remi and Jeanthon, Christian and Vaultier, Fr{\'e}d{\'e}ric and Rontani, Jean-Fran{\c c}ois}, editor = {Mock, T.} } @article {Lepelletier2014a, title = {Dinomyces arenysensis gen. et sp. nov. (rhizophydiales, dinomycetaceae fam. nov.), a chytrid infecting marine dinoflagellates}, journal = {Protist}, volume = {165}, number = {2}, year = {2014}, note = {tex.mendeley-tags: 2014,macumba,rcc,sbr?hyto$_\textrmd$ipo,sbr?hyto?app}, pages = {230{\textendash}244}, abstract = {Environmental 18S rRNA gene surveys of microbial eukaryotes have recently revealed the diversity of major parasitic agents in pelagic freshwater systems, consisting primarily of chytrid fungi. To date, only a few studies have reported the presence of chydrids in the marine environment and a limited number of marine chytrids have been properly identified and characterized. Here, we report the isolation and cultivation of a marine chytrid from samples taken during a bloom of the toxic dinoflagellate Alexandrium minutum in the Arenys de Mar harbour (Mediterranean Sea, Spain). Cross-infections using cultures and natural phytoplankton communities revealed that this chytrid is only able to infect certain species of dinoflagellates, with a rather wide host range but with a relative preference for Alexandrium species. Phylogenetic analyses showed that it belongs to the order Rhizophydiales, but cannot be included in any of the existing families within this order. Several ultrastructural characters confirmed the placement of this taxon within the Rhizophydiales as well its novelty notably in terms of zoospore structure. This marine chytridial parasitoid is described as a new genus and species, Dinomyces arenysensis, within the Dinomycetaceae fam. nov.}, keywords = {2014, chytrid, Dinoflagellates, Dinomyces arenysensis, Fungi, MACUMBA, microbial parasitoids, rcc, RCC?o?dd, Rhizophydiales., SBR$_\textrmP$hyto$_\textrmD$PO, sbr?hyto$_\textrmd$ipo, sbr?hyto?app}, doi = {10.1016/j.protis.2014.02.004}, url = {http://www.sciencedirect.com/science/article/pii/S1434461014000170}, author = {Lepelletier, Fr{\'e}d{\'e}ric and Karpov, Sergey A and Alacid, Elisabet and Le Panse, Sophie and Bigeard, Estelle and Garc{\'e}s, Esther and Jeanthon, Christian and Guillou, Laure} } @article {Jeanthon2011, title = {Diversity of cultivated and metabolically active aerobic anoxygenic phototrophic bacteria along an oligotrophic gradient in the Mediterranean Sea}, journal = {Biogeosciences}, volume = {8}, year = {2011}, note = {tex.mendeley-tags: 2011,rcc,sbr?hyto$_\textrmd$ipo,sbr?hyto?app}, pages = {1955{\textendash}1970}, keywords = {2011, rcc, SBR$_\textrmP$hyto$_\textrmD$PO, SBR$_\textrmP$hyto$_\textrmE$PPO, SBR$_\textrmP$hyto$_\textrmP$PM, sbr?hyto$_\textrmd$ipo, sbr?hyto?app}, doi = {10.5194/bg-8-1955-2011}, author = {Jeanthon, Christian and Boeuf, Dominique and Dahan, Oc{\'e}ane and Le Gall, F and Garczarek, Laurence and Bendif, El Mahdi and Lehours, Anne-Catherine} }