S. A. Amin, L. R. Hmelo, H. M. Van-tol, B. P. Durham, L. T. Carlson et al., Interaction and signalling between a cosmopolitan phytoplankton and associated bacteria, Nature, vol.28, issue.7554, pp.98-101, 1038.
DOI : 10.1038/nature14488

R. A. Andersen, Biology and systematics of heterokont and haptophyte algae, American Journal of Botany, vol.91, issue.10, pp.1508-1522, 2004.
DOI : 10.3732/ajb.91.10.1508

E. Armstrong, A. Rogerson, and J. Leftley, Utilisation of seaweed carbon by three surface-associated heterotrophic protists, Stereomyxa ramosa, Nitzschia alba and Labyrinthula sp., Aquatic Microbial Ecology, vol.21, pp.49-57, 2000.
DOI : 10.3354/ame021049

S. L. Baldauf, The Deep Roots of Eukaryotes, Science, vol.300, issue.5626, pp.1703-1706, 2003.
DOI : 10.1126/science.1085544

C. Burke, P. Steinberg, D. Rusch, S. Kjelleberg, T. et al., Bacterial community assembly based on functional genes rather than species, Proc. Natl, 2011.
DOI : 10.1073/pnas.1101591108

C. Burke, T. Thomas, M. Lewis, P. Steinberg, and S. Kjelleberg, Composition, uniqueness and variability of the epiphytic bacterial community of the green alga Ulva australis, The ISME Journal, vol.53, issue.4, pp.590-600, 2011.
DOI : 10.1128/AEM.66.10.4361-4365.2000

J. R. Chisholm, C. Dauga, E. Ageron, and P. A. Grimont, 'Roots' in mixotrophic algae, Nature, vol.381, issue.6581, p.382, 1996.
DOI : 10.1038/381382a0

D. K. Choudhary and B. N. Johri, Interactions of Bacillus spp. and plants ??? With special reference to induced systemic resistance (ISR), Microbiological Research, vol.164, issue.5, 2009.
DOI : 10.1016/j.micres.2008.08.007

J. M. Cock, A. F. Peters, C. , and S. M. , Brown algae, Current Biology, vol.21, issue.15, 2011.
DOI : 10.1016/j.cub.2011.05.006

URL : https://hal.archives-ouvertes.fr/hal-01113862

J. M. Cock, L. Sterck, P. Rouze, D. Scornet, A. E. Allen et al., The Ectocarpus genome and the independent evolution of multicellularity in brown algae, Nature, vol.10, issue.7298, pp.617-621, 1038.
DOI : 10.1038/nature09016

URL : https://hal.archives-ouvertes.fr/cea-00906990

S. M. Coelho, O. Godfroy, A. Arun, G. Le-corguille, A. F. Peters et al., Genetic regulation of life cycle transitions in the brown alga Ectocarpus, Plant Signaling & Behavior, vol.177, issue.11, pp.1858-1860, 2011.
DOI : 10.4161/psb.6.11.17737

S. M. Coelho, O. Godfroy, A. Arun, G. Le-corguille, A. F. Peters et al., OUROBOROS is a master regulator of the gametophyte to sporophyte life cycle transition in the brown alga Ectocarpus, Proceedings of the National Academy of Sciences, vol.108, issue.28, pp.11518-11523, 2011.
DOI : 10.1073/pnas.1102274108

S. Corre and D. Prieur, Density and Morphology of Epiphytic Bacteria on the Kelp Laminaria digitata, Botanica Marina, vol.33, issue.6, 1990.
DOI : 10.1515/botm.1990.33.6.515

J. A. Correa and J. Mclachlan, ENDOPHYTIC ALGAE OF CHONDRUS CRISPUS (RHODOPHYTA). III. HOST SPECIFICITY1, Journal of Phycology, vol.27, issue.3, pp.448-459, 1991.
DOI : 10.1111/j.0022-3646.1991.00448.x

J. F. Cryan and T. G. Dinan, Mind-altering microorganisms: the impact of the gut microbiota on brain and behaviour, Nature Reviews Neuroscience, vol.109, issue.10, pp.701-712, 2012.
DOI : 10.1038/nrn3346

S. M. Dittami, T. Barbeyron, C. Boyen, J. Cambefort, G. Collet et al., Genome and metabolic network of "Candidatus Phaeomarinobacter ectocarpi" Ec32, a new candidate genus of Alphaproteobacteria frequently associated with brown algae, Front. Genet, 2014.
URL : https://hal.archives-ouvertes.fr/hal-01079739

S. M. Dittami, L. Duboscq-bidot, M. Perennou, A. Gobet, E. Corre et al., Host???microbe interactions as a driver of acclimation to salinity gradients in brown algal cultures, The ISME Journal, vol.4, issue.1, pp.51-63, 2015.
DOI : 10.1371/journal.pone.0024570

S. M. Dittami, A. Gravot, D. Renault, S. Goulitquer, A. Eggert et al., Integrative analysis of metabolite and transcript abundance during the short-term response to saline and oxidative stress in the brown alga Ectocarpus siliculosus, Plant, Cell & Environment, vol.149, issue.4, pp.629-642, 2011.
DOI : 10.1111/j.1365-3040.2010.02268.x

URL : https://hal.archives-ouvertes.fr/hal-00597335

S. M. Dittami, D. Scornet, J. L. Petit, B. Segurens, D. Silva et al., Global expression analysis of the brown alga Ectocarpus siliculosus (Phaeophyceae) reveals large-scale reprogramming of the transcriptome in response to abiotic stress Bacterial diversity and 'unculturables'. Microbiol, Genome Biol, vol.10, issue.27, pp.4151-4160, 2000.

Y. Fukui, M. Abe, M. Kobayashi, Y. Yano, and M. Satomi, Isolation of Hyphomonas Strains that Induce Normal Morphogenesis in Protoplasts of the Marine Red Alga Pyropia yezoensis, Microbial Ecology, vol.66, issue.205, pp.556-566, 2014.
DOI : 10.1007/s00248-014-0423-4

F. Goecke, A. Labes, J. Wiesse, R. Schmaljohann, and J. Ímhoff, Observation of bacteria over the surface of released oogonia from Fucus vesiculosus L. (Phaeophyceae), Gayana. Bot??nica, vol.69, issue.2, pp.376-379, 2012.
DOI : 10.4067/S0717-66432012000200016

S. Goulitquer, P. Potin, and T. Tonon, Mass Spectrometry-Based Metabolomics to Elucidate Functions in Marine Organisms and Ecosystems, Marine Drugs, vol.10, issue.12, pp.849-880, 2012.
DOI : 10.3390/md10040849

URL : https://hal.archives-ouvertes.fr/hal-00925443

L. Grenville-briggs, C. M. Gachon, M. Strittmatter, L. Sterck, F. C. Kupper et al., A Molecular Insight into Algal-Oomycete Warfare: cDNA Analysis of Ectocarpus siliculosus Infected with the Basal Oomycete Eurychasma dicksonii, PLoS ONE, vol.136, issue.9, 2011.
DOI : 10.1371/journal.pone.0024500.s003

F. Gutiérrez-luna, J. López-bucio, J. Altamirano-hernández, E. Valencia-cantero, H. Reyes-de-la-cruz et al., Plant growth-promoting rhizobacteria modulate root-system architecture in Arabidopsis thaliana through volatile organic compound emission, Symbiosis, vol.21, issue.1, pp.75-83, 2010.
DOI : 10.1007/s13199-010-0066-2

J. Handelsman, Metagenomics: Application of Genomics to Uncultured Microorganisms, Microbiology and Molecular Biology Reviews, vol.68, issue.4, pp.669-685, 2004.
DOI : 10.1128/MMBR.68.4.669-685.2004

T. Harder, Marine Epibiosis: Concepts, Ecological Consequences and Host Defence, 2009.
DOI : 10.1007/978-3-540-69796-1_12

S. Heesch, G. Y. Cho, A. F. Peters, G. Le-corguille, C. Falentin et al., A sequence-tagged genetic map for the brown alga Ectocarpus siliculosus provides large-scale assembly of the genome sequence, New Phytologist, vol.45, issue.Suppl., pp.42-51, 2010.
DOI : 10.1111/j.1469-8137.2010.03273.x

M. B. Hengst, S. Andrade, B. Gonzalez, and J. A. Correa, Changes in Epiphytic Bacterial Communities of Intertidal Seaweeds Modulated by Host, Temporality, and Copper Enrichment, Microbial Ecology, vol.71, issue.2, pp.282-290, 2010.
DOI : 10.1007/s00248-010-9647-0

J. Hollants, F. Leliaert, O. De-clerck, and A. Willems, What we can learn from sushi: a review on seaweed-bacterial associations, FEMS Microbiology Ecology, vol.83, issue.1, 2013.
DOI : 10.1111/j.1574-6941.2012.01446.x

I. Joint, K. Tait, W. , and G. , Cross-kingdom signalling: exploitation of bacterial quorum sensing molecules by the green seaweed Ulva, Philosophical Transactions of the Royal Society B: Biological Sciences, vol.70, issue.10, pp.1223-1233, 2007.
DOI : 10.1128/IAI.70.10.5635-5646.2002

F. C. Kupper, L. J. Carpenter, G. B. Mcfiggans, C. J. Palmer, T. J. Waite et al., Iodide accumulation provides kelp with an inorganic antioxidant impacting atmospheric chemistry, Proceedings of the National Academy of Sciences, vol.105, issue.19, pp.6954-69580709959105, 2008.
DOI : 10.1073/pnas.0709959105

T. Lachnit, D. Meske, M. Wahl, T. Harder, and R. Schmitz, Epibacterial community patterns on marine macroalgae are host-specific but temporally variable, Environmental Microbiology, vol.62, issue.371, pp.655-665, 2011.
DOI : 10.1111/j.1462-2920.2010.02371.x

L. Bail, A. Billoud, B. Kowalczyk, N. Kowalczyk, M. Gicquel et al., Auxin Metabolism and Function in the Multicellular Brown Alga Ectocarpus siliculosus, PLANT PHYSIOLOGY, vol.153, issue.1, pp.128-144, 2010.
DOI : 10.1104/pp.109.149708

L. Bail, A. Dittami, S. M. De-franco, P. O. Rousvoal, S. Cock et al., Normalisation genes for expression analyses in the brown alga model Ectocarpus siliculosus, BMC Molecular Biology, vol.9, issue.1, pp.75-85, 2008.
DOI : 10.1186/1471-2199-9-75

Y. K. Lee and S. K. Mazmanian, Has the Microbiota Played a Critical Role in the Evolution of the Adaptive Immune System?, Science, vol.330, issue.6012, pp.1768-1773, 2010.
DOI : 10.1126/science.1195568

D. R. Littman and E. G. Pamer, Role of the Commensal Microbiota in Normal and Pathogenic Host Immune Responses, Cell Host & Microbe, vol.10, issue.4, pp.311-323, 2011.
DOI : 10.1016/j.chom.2011.10.004

M. Macel, N. M. Van-dam, and J. J. Keurentjes, Metabolomics: the chemistry between ecology and genetics, Molecular Ecology Resources, vol.105, issue.4, 2010.
DOI : 10.1111/j.1755-0998.2010.02854.x

K. Marshall, I. Joint, M. E. Callow, J. A. Callow, M. Maeda et al., Effect of Marine Bacterial Isolates on the Growth and Morphology of Axenic Plantlets of the Green Alga Ulva linza, Microbial Ecology, vol.22, issue.2, pp.302-310, 1986.
DOI : 10.1007/s00248-006-9060-x

A. Maruyama, M. Maeda, and U. Simidu, Distribution and classification of marine bacteria with the ability of cytokinin and auxin production., Bulletin of Japanese Society of Microbial Ecology, vol.5, issue.1, pp.1-8, 1990.
DOI : 10.1264/microbes1986.5.1

Y. Matsuo, H. Imagawa, M. Nishizawa, and Y. Shizuri, Isolation of an Algal Morphogenesis Inducer from a Marine Bacterium, Science, vol.307, issue.5715, 2005.
DOI : 10.1126/science.1105486

Y. Matsuo, M. Suzuki, H. Kasai, Y. Shizuri, and S. Harayama, Isolation and phylogenetic characterization of bacteria capable of inducing differentiation in the green alga Monostroma oxyspermum, Environmental Microbiology, vol.146, issue.1, pp.25-35, 2003.
DOI : 10.1046/j.1462-2920.2001.00155.x

E. A. Mayer, Gut feelings: the emerging biology of gut???brain communication, Nature Reviews Neuroscience, vol.351, issue.8, pp.453-466, 2011.
DOI : 10.1038/nrn3071

D. G. Meldau, S. Meldau, L. H. Hoang, S. Underberg, H. Wunsche et al., Dimethyl Disulfide Produced by the Naturally Associated Bacterium Bacillus sp B55 Promotes Nicotiana attenuata Growth by Enhancing Sulfur Nutrition, The Plant Cell, vol.25, issue.7, pp.2731-2747, 2013.
DOI : 10.1105/tpc.113.114744

D. G. Müller, C. M. Gachon, and F. C. Kupper, Axenic clonal cultures of filamentous brown algae: initiation and maintenance, Cah. Biol. Mar, vol.49, pp.59-65, 2008.

K. Nakanishi, M. Nishijima, M. Nishimura, K. Kuwano, and N. Saga, BACTERIA THAT INDUCE MORPHOGENESIS IN ULVA PERTUSA (CHLOROPHYTA) GROWN UNDER AXENIC CONDITIONS1, Journal of Phycology, vol.32, issue.3, pp.479-482, 1996.
DOI : 10.1111/j.0022-3646.1996.00479.x

K. Nakanishi, M. Nishijima, A. M. Nomoto, A. Yamazaki, and N. Saga, Requisite Morphologic Interaction for Attachment between Ulva pertusa (Chlorophyta) and Symbiotic Bacteria, Marine Biotechnology, vol.1, issue.1, pp.107-111, 1007.
DOI : 10.1007/PL00011744

A. C. Newton, B. D. Fitt, S. D. Atkins, D. R. Walters, D. et al., Pathogenesis, parasitism and mutualism in the trophic space of microbe???plant interactions, Trends in Microbiology, vol.18, issue.8, pp.365-373, 2010.
DOI : 10.1016/j.tim.2010.06.002

P. Nyvall, E. Corre, C. Boisset, T. Barbeyron, S. Rousvoal et al., Characterization of Mannuronan C-5-Epimerase Genes from the Brown Alga Laminaria digitata, PLANT PHYSIOLOGY, vol.133, issue.2, pp.726-735, 2003.
DOI : 10.1104/pp.103.025981

M. Pedersen, Ectocarpus fasciculatus: Marine Brown Alga requiring Kinetin, Nature, vol.114, issue.5143, 1968.
DOI : 10.1038/218776a0

A. Peters, D. Marie, D. Scornet, B. Kloareg, and J. Cock, (ECTOCARPALES, PHAEOPHYCEAE) AS A MODEL ORGANISM FOR BROWN ALGAL GENETICS AND GENOMICS, Journal of Phycology, vol.40, issue.6, pp.1079-1088, 2004.
DOI : 10.1111/j.1529-8817.2004.04058.x

A. F. Peters, A. D. Mann, C. A. Cordova, J. Brodie, J. A. Correa et al., Genetic diversity of Ectocarpus (Ectocarpales, Phaeophyceae) in Peru and northern Chile, the area of origin of the genome-sequenced strain, New Phytologist, vol.43, issue.1, pp.30-41, 2010.
DOI : 10.1111/j.1469-8137.2010.03303.x

L. Provasoli and I. Pintner, Bacteria induced polymorphism in an axenic laboratory strain of Ulva lactuca (Chlorophyceae), J. Phycol, vol.16, 1980.

O. Ravanko, Morphological, developmental, and taxonomic studies in the Ectocarpus complex (Phaeophyceae), Nova Hedwigia, vol.20, p.79, 1970.

F. C. Schroeder, M. L. Del-campo, J. B. Grant, D. B. Weibel, S. R. Smedley et al., Pinoresinol: A lignol of plant origin serving for defense in a caterpillar, Proceedings of the National Academy of Sciences, vol.103, issue.42, pp.15497-15501, 2006.
DOI : 10.1073/pnas.0605921103

R. P. Singh, A. J. Bijo, R. S. Baghel, C. R. Reddy, B. R. Jha et al., Role of bacterial isolates in enhancing the bud induction in the industrially important red alga Gracilaria dura, FEMS Microbiology Ecology, vol.76, issue.2, pp.381-392, 2011.
DOI : 10.1111/j.1574-6941.2011.01057.x

C. A. Smith, E. J. Want, G. O-'maille, R. Abagyan, and G. Siuzdak, XCMS:?? Processing Mass Spectrometry Data for Metabolite Profiling Using Nonlinear Peak Alignment, Matching, and Identification, Analytical Chemistry, vol.78, issue.3, pp.779-787, 1021.
DOI : 10.1021/ac051437y

M. Spoerner, T. Wichard, T. Bachhuber, J. Stratmann, W. W. Oertel et al., (Chlorophyta) Depends on A Combination of Two Bacterial Species Excreting Regulatory Factors, Journal of Phycology, vol.9, issue.6, pp.1433-1447, 1023.
DOI : 10.1111/j.1529-8817.2012.01231.x

M. T. Suzuki, M. S. Rappe, Z. W. Haimberger, H. Winfield, N. Adair et al., Bacterial diversity among small-subunit rRNA gene clones and cellular isolates from the same seawater sample, Appl. Environ. Microbiol, vol.63, pp.983-989, 1997.

S. Van-der-ent, S. C. Van-wees, and C. M. Pieterse, Jasmonate signaling in plant interactions with resistance-inducing beneficial microbes, Phytochemistry, vol.70, issue.13-14, 2009.
DOI : 10.1016/j.phytochem.2009.06.009

F. Weinberger, Pathogen-Induced Defense and Innate Immunity in Macroalgae, The Biological Bulletin, vol.213, issue.3, pp.290-302, 2007.
DOI : 10.2307/25066646

F. Weinberger, J. Beltran, J. A. Correa, G. Pohnert, N. Kumar et al., SP. (RHODOPHYTA) IS BACTERIALLY CONTROLLED, Journal of Phycology, vol.43, issue.2, pp.235-241, 2007.
DOI : 10.1111/j.1529-8817.2007.00329.x

W. G. Weisburg, S. M. Barns, D. A. Pelletier, L. , and D. J. , 16S ribosomal DNA amplification for phylogenetic study., Journal of Bacteriology, vol.173, issue.2, pp.697-703, 1991.
DOI : 10.1128/jb.173.2.697-703.1991

W. B. Whitman, D. C. Coleman, and W. J. Wiebe, Prokaryotes: The unseen majority, Proceedings of the National Academy of Sciences, vol.95, issue.12, pp.6578-6583, 1998.
DOI : 10.1073/pnas.95.12.6578

J. Yang, J. W. Kloepper, and C. M. Ryu, Rhizosphere bacteria help plants tolerate abiotic stress, Trends in Plant Science, vol.14, issue.1, 2009.
DOI : 10.1016/j.tplants.2008.10.004