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Dothideomycetes and Leotiomycetes Sterile Mycelia

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Dothideomycetes and Leotiomycetes Sterile Mycelia Gnavi et al. SpringerPlus 2014, 3:508 http://www.springerplus.com/content/3/1/508 a SpringerOpen Journal RESEARCH Open Access Dothideomycetes and Leotiomycetes sterile mycelia isolated from the Italian seagrass Posidonia oceanica based on rDNA data Giorgio Gnavi1, Enrico Ercole2, Luigi Panno1, Alfredo Vizzini2 and Giovanna C Varese1* Abstract Marine fungi represent a group of organisms extremely important from an ecological and biotechnological point of view, but often still neglected. In this work, an in-depth analysis on the systematic and the phylogenetic position of 21 sterile mycelia, isolated from Posidonia oceanica, was performed. The molecular (ITS and LSU sequences) analysis showed that several of them are putative new species belonging to three orders in the Ascomycota phylum: Pleosporales, Capnodiales and Helotiales. Phylogenetic analyses were performed using Bayesian Inference and Maximum Likelihood approaches. Seven sterile mycelia belong to the genera firstly reported from marine environments. The bioinformatic analysis allowed to identify five sterile mycelia at species level and nine at genus level. Some of the analyzed sterile mycelia could belong to new lineages of marine fungi. Keywords: Dothideomycetes; Fungal molecular phylogeny; Leotiomycetes; Marine fungi; Posidonia oceanica; Sterile mycelia Background metabolites that often display promising biological and The oceans host a vast biodiversity. Most of the marine pharmacological properties (Rateb and Ebel 2011) and the microbial biodiversity has not yet been discovered and remarkably high hit rates of marine compounds in screen- characterized, both taxonomically and biochemically. ing for drug leads makes the search in marine organisms Marine fungal strains have been obtained from virtually quite attractive. every possible marine habitat, including inorganic matter, In our previous work (Panno et al. 2013) the diversity, marine microbial communities, seagrasses, algae, drift- the ecological role and the potential biotechnological appli- wood, invertebrates and vertebrates (Imhoff et al. 2011; cations of marine fungi associated with different parts Rateb and Ebel 2011). However, it is worth mentioning (leaves, rhizomes, roots and matte) of the seagrass Posidonia that the fraction of cultivable isolates is very low, around oceanica (L.) Delile, were investigated. The results showed 1% or less, with regard to the overall estimated biodiver- that the mycobiota associated to young P. oceanica sity (Rateb and Ebel 2011), similar to the situation with plants is very rich, both in term of load and number of bacteria (Alain and Querellou 2009). Only recently, the species, and is higher than those found on algae, corals, immense diversity of microbes in the marine environ- sponges and other seagrasses such as Thalassia testudinum ments has attracted the attention of the scientific commu- Banks ex König and Zostera marina L. (Meyers et al. 1965; nity for their almost untouched capacity to produce Newell 1981; Toledo-Hernández et al. 2007; Suryanarayanan bioactive natural products (Imhoff et al. 2011). Marine 2012; Zuccaro et al. 2008). The mycobiota composition and bacteria and fungi produce structurally unique secondary structure changes significantly in the four parts of P. oceanica,displayinga“district specificity” thatmaybedue to multiple factors: specific environmental parameters * Correspondence: [email protected] 1Mycotheca Universitatis Taurinensis (M.U.T.), Department of Life Sciences (nutrients, light, different hydrodynamic motions, etc.), and Systems Biology (DBIOS), University of Turin, Viale Mattioli, 25, 10125 Turin, Italy Full list of author information is available at the end of the article © 2014 Gnavi et al.; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. Gnavi et al. SpringerPlus 2014, 3:508 Page 2 of 11 http://www.springerplus.com/content/3/1/508 presence of different antagonistic macro- and micro- stage. Their anamorphs are either undiscovered or it is as- organisms, presence of high concentration of tannic acid in sumed that they have been lost in the process of evolution the leaves (Mazzella and Alberte 1986; Pergent et al. 2008). (Wang et al. 2006b). Surprisingly, most of the few fungi that have been already The aim of this work was to investigate the systematic reported associated with P. oceanica by other authors (Jones and the phylogenetic position of 21 SM isolated in our 1963; Cuomo et al. 1985; Garzoli 2013) were not found in previous work (Panno et al. 2013), from rhizomes and our survey. This result could be explained considering the matte of P. oceanica, using the ITS and LSU (28S) rDNA different samplings periods (young plants in spring vs old or regions. senescent plants in autumn and winter) in relation to the life cycle of this seagrass, the different parts of the plant analysed, and the focus on marine obligate species or on the Results and discussion total mycobiota. According to the literature many marine-derived fungi Moreover the results showed that about 30% of the (10–40% of the isolates according to the original sub- isolated fungal taxa grow only as sterile mycelia (SM) strate) are able to grow only as SM in axenic conditions exclusively associated to matte and rhizomes. Most of these both on normal and specific media containing seawater SM remained unidentified, since their ITS sequences dis- (Morrison-Gardiner 2002; Raghukumar 2004; Damare played low homologies with those present in public data- et al. 2006; Panno et al. 2013). The high presence of SM bases. On the other hand, this preliminary molecular in marine environment supports the hypothesis that analysis showed that they could belong to Dothideomycetes many fungi may have evolved, as a system of preferential O.E. Erikss. and Winka (mainly Pleosporales Luttr. ex M.E. dispersion, the fragmentation of the hyphae in respect to Barr) and Leotiomycetes O.E. Erikss. and Winka (Helotiales the production of conidia or spores (Damare et al. 2006). Nannf. ex Korf and Lizon). Another explanation could be the composition of the cul- The Dothideomycetes represents the largest class of ture media that do not mimic in situ conditions limiting Ascomycota Caval.-Sm. and displays a high level of eco- fungi to grow and/or sporulate ex situ. logical diversity (Hyde et al. 2013; Egidi et al. 2014). The predominance of Ascomycota and, in particular, of They are often found as pathogens, infecting a broad fungi belonging to Dothideomycetes and Leotiomycetes range of hosts (Crous et al. 2013; Hyde et al. 2013), but classes in marine habitats has been discussed in the litera- also as endophytes or epiphytes on living plants and as ture, and the most important hypothesis is that these fungi saprobes degrading cellulose and other complex carbo- have evolved efficient adaptations to the aquatic ecosys- hydrates in dead or partially digested plant matter, in leaf tem (Prasannarai and Sridhar 2001; Vijaykrishna et al. litter or dung. However, their nutritional modes are not 2006); it is also possible that those groups of fungi are limited to associations with plants; several species are more readily cultivable compared to other and it could be mycobionts in lichens, while others occur as parasites easily recovered when culture-dependent techniques are on other fungi or animals (Shearer et al. 2009; Hyde applied (Baker et al. 2008). et al. 2013; Perez-Ortega et al. 2014; Schoch et al. 2009). The relevance of SM in marine ecosystems prompted us Adaptation to fresh- and salt-water habitats has occurred to analyse the systematic and the phylogenetic position of multiple times within the Dothideomycetes (Shearer et al. 21 sterile mycelia, isolated from Posidonia oceanica. The 2009; Perez-Ortega et al. 2014). Marine Dothideomycetes ITS and LSU analysis, molecular markers fundamental for are considered mainly intertidal, occurring on a wide systematic and phylogenetic studies, allowed us to attri- range of substrata like mangrove habitat, and sea and bute the precise taxonomic position: 14 strains belong marsh grasses, and they usually do not produce an ana- to Dothideomycetes-Pleosporales, 1 to Dothideomycetes- morphic state. Species that occur completely submerged Capnodiales and six to Leotiomycetes-Helotiales s.l. are mostly parasites or symbionts of seagrasses or marine Both the applied phylogenetic analysis yielded the same algae (Suetrong et al. 2009; Hyde et al. 2013). topology; therefore, only the Bayesian trees with both As regard to Leotiomycetes, this class includes both non- Bayesian Posterior Probabilities (BPP) and Maximum lichen- and lichen-forming fungi. These species colonize a Likelihood Bootstrap (MLB) values are shown (Figures 1, large variety of habitats, and act as saprobes or form para- 2 and 3). The LSU data matrix of the Dothideomycetes- sitic associations with a wide range of other organisms. Pleosporales tree included a total of 159 sequences (14 Besides parasites and saprobes, the group includes endo- newly generated, 145 from GenBank). The LSU data phytes and symbionts of a wide range of plants (Wang matrix of the Dothideomycetes-Capnodiales tree included et al. 2006a) and it has recently been signalled also from a total of 31 sequences (1 newly generated, 30 from marine environments (Burgaud et al. 2009; Jones
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