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Chemically-Mediated Interactions Between Macroalgae, Their Fungal Chemically-Mediated Interactions Between Macroalgae, Their Fungal Endophytes, and Protistan Pathogens Marine Vallet, Martina Strittmatter, Pedro Murúa, Sandrine Lacoste, Joëlle Dupont, Cédric Hubas, Grégory Genta-Jouve, Claire Gachon, Gwang Kim, Soizic Prado To cite this version: Marine Vallet, Martina Strittmatter, Pedro Murúa, Sandrine Lacoste, Joëlle Dupont, et al.. Chemically-Mediated Interactions Between Macroalgae, Their Fungal Endophytes, and Protistan Pathogens. Frontiers in Microbiology, Frontiers Media, 2018, 9, pp.3161. 10.3389/fmicb.2018.03161. hal-02297595 HAL Id: hal-02297595 https://hal.sorbonne-universite.fr/hal-02297595 Submitted on 26 Sep 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. ORIGINAL RESEARCH published: 21 December 2018 doi: 10.3389/fmicb.2018.03161 Chemically-Mediated Interactions Between Macroalgae, Their Fungal Endophytes, and Protistan Pathogens Marine Vallet 1, Martina Strittmatter 2, Pedro Murúa 2, Sandrine Lacoste 3, Joëlle Dupont 3, Cedric Hubas 4, Gregory Genta-Jouve 1,5, Claire M. M. Gachon 2, Gwang Hoon Kim 6 and Soizic Prado 1* 1 Muséum National d’Histoire Naturelle, Unité Molécules de Communication et Adaptation des Micro-organismes, UMR 7245, CP 54, Paris, France, 2 The Scottish Association for Marine Science, Scottish Marine Institute, Oban, United Kingdom, 3 Institut Systématique Evolution Biodiversité (ISYEB), Muséum National d’Histoire Naturelle, CNRS, Sorbonne Université, EPHE, Paris, France, 4 Unité Biologie des organismes et écosystèmes aquatiques (UMR BOREA), Muséum national d’Histoire Naturelle, Sorbonne Université, Université de Caen Normandie, Université des Antilles, CNRS, IRD; Station Marine de Concarneau, Concarneau, France, 5 Université Paris Descartes, Laboratoire de Chimie-Toxicologie Analytique et Cellulaire (C-TAC), UMR CNRS 8638, COMETE, Paris, France, 6 Department of Biology, Kongju National University, Kongju, South Korea Filamentous fungi asymptomatically colonize the inner tissues of macroalgae, yet their ecological roles remain largely underexplored. Here, we tested if metabolites produced by fungal endophytes might protect their host against a phylogenetically broad spectrum of protistan pathogens. Accordingly, the cultivable fungal endophytes Edited by: Marcelino T. Suzuki, of four brown algal species were isolated and identified based on LSU and SSU Sorbonne Universités, France sequencing. The fungal metabolomes were tested for their ability to reduce the infection Reviewed by: by protistan pathogens in the algal model Ectocarpus siliculosus. The most active Ravindra Nath Kharwar, metabolomes effective against the oomycetes Eurychasma dicksonii and Anisolpidium Banaras Hindu University, India Ekaterina Shelest, ectocarpii, and the phytomixid Maullinia ectocarpii were further characterized chemically. German Center for Integrative Several pyrenocines isolated from Phaeosphaeria sp. AN596H efficiently inhibited the Biodiversity Research, Germany infection by all abovementioned pathogens. Strikingly, these compounds also inhibited *Correspondence: Soizic Prado the infection of nori (Pyropia yezoensis) against its two most devastating oomycete [email protected] pathogens, Olpidiopsis pyropiae, and Pythium porphyrae. We thus demonstrate that fungal endophytes associated with brown algae produce bioactive metabolites which Specialty section: This article was submitted to might confer protection against pathogen infection. These results highlight the potential Aquatic Microbiology, of metabolites to finely-tune the outcome of molecular interactions between algae, a section of the journal their endophytes, and protistan pathogens. This also provide proof-of-concept toward Frontiers in Microbiology the applicability of such metabolites in marine aquaculture to control otherwise Received: 18 September 2018 Accepted: 06 December 2018 untreatable diseases. Published: 21 December 2018 Keywords: fungal endophytes, macroalgae, protistan pathogens, secondary metabolites, metabolome, molecular Citation: interactions, pyrenocines Vallet M, Strittmatter M, Murúa P, Lacoste S, Dupont J, Hubas C, Genta-Jouve G, Gachon CMM, INTRODUCTION Kim GH and Prado S (2018) Chemically-Mediated Interactions Macroalgae (seaweed) are important ecosystems engineers that contribute significantly to primary Between Macroalgae, Their Fungal Endophytes, and Protistan production in cold and temperate coastal seas and drive essential functions in nutrient cycling Pathogens. Front. Microbiol. 9:3161. (Dayton, 1985). Macroalgae represent also a growing economic resource and their aquaculture doi: 10.3389/fmicb.2018.03161 has increased over the last decades, in particular for the Asian food market. In the last 25 years, Frontiers in Microbiology | www.frontiersin.org 1 December 2018 | Volume 9 | Article 3161 Vallet et al. Microbial Interactions Within Seaweed Holobiont the production of Pyropia (nori, formerly called Porphyra), the temperature (Tellenbach and Sieber, 2012). Similar examples are alga extensively used as sushi wrap in Asiatic cuisine, has more known in the phyllosphere; for example, cocoa trees inoculated than tripled, mostly due to a rapid expansion in China and with endophytes isolated from healthy leaves showed increased Korea. Accordingly, human consumption now represents 99% of resistance to a Phytophthora pathogen (Arnold et al., 2003). the global algal market which keeps growing at an annual rate The plant-endophyte coevolution hypothesis (Ji et al., 2009) nearing 10% (Food and Agricultural Organization of the United suggests that endophytes might benefit plants by producing Nations (FAO), 2014). bioactive secondary metabolites. Indeed, endophytes isolated Like most eukaryotes, macroalgae are colonized by widely from Pezicula were shown to produce fungicidal metabolites diverse microorganisms that interact with them throughout toxic to the pathogens of their host (Arnold et al., 2003). their life cycle (Singh and Reddy, 2015). Bacterial communities Conversely, some endophytes may be latent or opportunistic associated with seaweed have profound effects on their growth, pathogens when they exhibit virulence factors or produce toxic defense, development, and nutrition (Egan et al., 2013). Epiphytic metabolites. Hence, the asymptomatic fungal colonization of bacterial communities are essential to the morphological plant organs would be the result of a balance between endophytic development of certain green algae (Wichard et al., 2015) and virulence and defense responses, preventing the development of numerous studies demonstrated the contribution of bacteria to disease (Schulz et al., 1999). In the phycosphere, endophytes are nutrient acquisition or defense by the production of vitamins also able to produce bioactive antimicrobial metabolites (Zhang (Wichard and Beemelmanns, 2018). These multiple interactions et al., 2009; Singh et al., 2015). It is thus plausible to assume led to define macroalgae and their associated microbiota as a that some secondary metabolites may mediate a mutualistic “superorganism,” called the holobiont (Egan et al., 2013). relationship, and may have a protective role toward other algae- Within this large microbial diversity, bacteria have been associated microbiotes such as pathogens. extensively studied, yet macroalgae also harbor a large diversity Macroalgae, comparable with plants in this context, are indeed of fungi. The first report of an obligate mycophycobiosis subject to numerous biotic stressors (Gachon et al., 2010; Thomas between the Fucales Ascophyllum nodosum, Pelvetia canaliculata, et al., 2014) such as viral, bacterial, fungal, oomycete, chytrid and the fungal endosymbiont Stigmidium ascophylli (formerly pathogens, and algal colonization in the form of endo- or Mycosphaerella ascophylli) dates back from more than a century epiphytes. In the seaweed industry, the oomycetes Olpidiopsis (Cotton, 1907; Stanley, 1991), and it has been suggested that porphyrae and Pythium porphyrae are the most destructive the symbiont may protect the algae host from desiccation, while pathogens of laver (Kim et al., 2014). As the industry quickly obtaining nutrients in exchange (Garbary and Macdonald, 1995; develops and intensifies, pathogen outbreaks are becoming a Decker and Garbary, 2005). In the same vein, the fungal symbiont growing cause of concern. A recent Olpidiopsis outbreak in Turgidosculum ulvae colonizing the inner tissue of the green Korea was estimated to have reduced sale volumes by a quarter, alga Blidingia minima can induce dark spots that are never notwithstanding the cost of disease management (Kim et al., consumed by the predatory gastropods of the host (Kohlmeyer 2014; Gachon et al., 2017). Crop protection measures are at best and Volkmann-Kohlmeyer, 2003). partially effective, and novel treatments are needed. Many filamentous fungi can also asymptomatically colonize In brown algae, the obligate endobiotic oomycetes the algal inner tissues without causing any apparent damage or Eurychasma dicksonii and Anisolpidium ectocarpii are frequently disease (Porras-Alfaro
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