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Lepinay, Alexandra; Capiaux, Herve; Turpin, Vincent; Mondeguer, Florence; Lebeau, Thierry. |
Haslea ostrearia produces a water-soluble, blue-green pigment, called marennine, with proven economic benefits (as a bioactive compound used to green oysters, which improves their market value). Incomplete knowledge of the ecological features of this marine diatom complicates its cultivation. More specifically, the ecology of bacteria surrounding H. ostrearia in ponds is what remains unknown. The structure of this bacterial community was previously analyzed by means of PCR-TTGE before and after isolating H. ostrearia cells recovered from 4 localities in order to distinguish the relative parts of the biotope and biocenose and to describe the temporal dynamics of the bacterial community structure at two time scales (2 weeks vs. 9 months). The bacterial... |
Tipo: Text |
Palavras-chave: Biofilm; Ecology; Metabolic fingerprinting; Microalgae; Phycosphere; TTGE. |
Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00326/43737/43344.pdf |
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Lepinay, Alexandra; Capiaux, Hervé; Turpin, Vincent; Mondeguer, Florence; Baron, Regis; Lebeau, Thierry. |
The marine diatom Haslea ostrearia produces a water-soluble blue-pigment named marennine of economic interest (e.g. in aquaculture for the greening of oysters). Up to date the studies devoted to ecological conditions under which this microalga develops never took into account the bacterial-H. ostrearia relationships. In this study the bacterial community was analysed by PCR-TTGE before and after H. ostrearia isolation cells recovered from 4 localities, to distinguish the relative part of the biotope and the biocenose and eventually to describe the temporal dynamic of the structure of the bacterial community. The bacterial structure of the phycosphere differed strongly from that of the bulk sediment. The similarity between bacteria recovered from the... |
Tipo: Text |
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Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00342/45365/44861.pdf |
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Lepinay, Alexandra; Turpin, Vincent; Mondeguer, Florence; Grandet-marchant, Quentin; Capiaux, Herve; Baron, Regis; Lebeau, Thierry. |
A first insight on the interactions between bacteria isolated from monospecific cultures of the marine diatom Haslea ostrearia and this microalgae is described in this work. From 28 bacterial isolates, the maximal growth rate and the maximal cell concentration were on average 58% and 27% higher (max. 67% for isolate B22). Isolates B5, B10 (both Saccharospirillum sp.) and B22 (Rhodobacter sp.) were the most efficient. The geographical origin of H. ostrearia from which bacteria were isolated had no impact on the algal growth performances, and a given bacterial isolate led to the same algal growth irrespective of the geographical origin of H. ostrearia. To explain the results obtained, a comprehensive integrative strategy was conducted that analyzed the... |
Tipo: Text |
Palavras-chave: Bacterial selection; Plant-growth-promoting bacteria; Phycosphere; Metabolomics. |
Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00429/54036/55340.pdf |
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Mondeguer, Florence; Lepinay, Alexandra; Capiaux, Hervé; Turpin, Vincent; Baron, Regis; Hess, Philipp; Lebeau, Thierry; Boug,. |
The marine diatom Haslea ostrearia [1] produces a water-soluble blue-pigment named marennine [2] of economic interest. But the lack of knowledge of the ecological conditions, under which this microalga develops in its natural ecosystem, more especially bacteria H. ostrearia interactions, prevents any optimization of its culture in well-controlled conditions. The structure of the bacterial community was analyzed by PCR-TTGE before and after the isolation of H. ostrearia cells recovered from 4 localities, to distinguish the relative part of the biotope and the biocenose and eventually to describe the temporal dynamic of the structure of the bacterial community at two time-scales. The differences in genetic fingerprints, more especially high between two H.... |
Tipo: Text |
Palavras-chave: Haslea ostrearia; Marine diatom; Co-culture microalgae; Bacterial community; PCR-TTGE; High Resolution Mass Spectrometry; Untargeted metabolomics. |
Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00342/45367/44862.pdf |
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Mondeguer, Florence; Lepinay, Alexandra; Capiaux, Hervé; Turpin, Vincent; Lebeau, Thierry. |
The marine diatom Haslea ostrearia [1] produces a water-soluble blue-pigment named marennine [2] of economic interest. But the lack of knowledge of the ecological conditions, under which this microalga develops in its natural ecosystem, more especially bacteria H. ostrearia interactions, prevents any optimization of its culture in well-controlled conditions. The structure of the bacterial community was analyzed by PCR-TTGE before and after the isolation of H. ostrearia cells recovered from 4 localities, to distinguish the relative part of the biotope and the biocenose and eventually to describe the temporal dynamic of the structure of the bacterial community at two time-scales. The differences in genetic fingerprints, more especially high between two H.... |
Tipo: Text |
Palavras-chave: Haslea ostrearia; Marine diatom; Co-culture microalgae; Bacterial community; TTGE; High Resolution Mass Spectrometry; Untargeted metabolomics. |
Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00342/45368/44863.pdf |
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