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      Isolation of the symbiotic fungus of Acromyrmex pubescens and phylogeny of Leucoagaricus gongylophorus from leaf-cutting ants

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          Abstract

          Leaf-cutting ants live in an obligate symbiosis with a Leucoagaricus species, a basidiomycete that serves as a food source to the larvae and queen. The aim of this work was to isolate, identify and complete the phylogenetic study of Leucoagaricus gongylophorus species of Acromyrmex pubescens. Macroscopic and microscopic features were used to identify the fungal symbiont of the ants. The ITS1-5.8S-ITS2 region was used as molecular marker for the molecular identification and to evaluate the phylogeny within the Leucoagaricus genus. One fungal symbiont associated with A. pubescens was isolated and identified as L. gongylophorus. The phylogeny of Leucoagaricus obtained using the ITS molecular marker revealed three well established monophyletic groups. It was possible to recognize one clade of Leucoagaricus associated with phylogenetically derived leaf-cutting ants ( Acromyrmex and Atta). A second clade of free living forms of Leucoagaricus (non-cultivated), and a third clade of Leucoagaricus associated with phylogenetically basal genera of ants were also recognized. The clades corresponded to traditional taxonomic groups, and were differentiated by ecological habitats of different species.

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          The CLUSTAL_X windows interface: flexible strategies for multiple sequence alignment aided by quality analysis tools.

          J. Thompson (1997)
          CLUSTAL X is a new windows interface for the widely-used progressive multiple sequence alignment program CLUSTAL W. The new system is easy to use, providing an integrated system for performing multiple sequence and profile alignments and analysing the results. CLUSTAL X displays the sequence alignment in a window on the screen. A versatile sequence colouring scheme allows the user to highlight conserved features in the alignment. Pull-down menus provide all the options required for traditional multiple sequence and profile alignment. New features include: the ability to cut-and-paste sequences to change the order of the alignment, selection of a subset of the sequences to be realigned, and selection of a sub-range of the alignment to be realigned and inserted back into the original alignment. Alignment quality analysis can be performed and low-scoring segments or exceptional residues can be highlighted. Quality analysis and realignment of selected residue ranges provide the user with a powerful tool to improve and refine difficult alignments and to trap errors in input sequences. CLUSTAL X has been compiled on SUN Solaris, IRIX5.3 on Silicon Graphics, Digital UNIX on DECstations, Microsoft Windows (32 bit) for PCs, Linux ELF for x86 PCs, and Macintosh PowerMac.
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            One hundred and seventeen clades of euagarics.

            Stig Jacobsson, Rytas Vilgalys, Heinz Clémençon … (2002)
            This study provides a first broad systematic treatment of the euagarics as they have recently emerged in phylogenetic systematics. The sample consists of 877 homobasidiomycete taxa and includes approximately one tenth (ca. 700 species) of the known number of species of gilled mushrooms that were traditionally classified in the order Agaricales. About 1000 nucleotide sequences at the 5(') end of the nuclear large ribosomal subunit gene (nLSU) were produced for each taxon. Phylogenetic analyses of nucleotide sequence data employed unequally weighted parsimony and bootstrap methods. Clades revealed by the analyses support the recognition of eight major groups of homobasidiomycetes that cut across traditional lines of classification, in agreement with other recent phylogenetic studies. Gilled fungi comprise the majority of species in the euagarics clade. However, the recognition of a monophyletic euagarics results in the exclusion from the clade of several groups of gilled fungi that have been traditionally classified in the Agaricales and necessitates the inclusion of several clavaroid, poroid, secotioid, gasteroid, and reduced forms that were traditionally classified in other basidiomycete orders. A total of 117 monophyletic groups (clades) of euagarics can be recognized on the basis on nLSU phylogeny. Though many clades correspond to traditional taxonomic groups, many do not. Newly discovered phylogenetic affinities include for instance relationships of the true puffballs (Lycoperdales) with Agaricaceae, of Panellus and the poroid fungi Dictyopanus and Favolaschia with Mycena, and of the reduced fungus Caripia with Gymnopus. Several clades are best supported by ecological, biochemical, or trophic habits rather than by morphological similarities. (c) 2002 Elsevier Science (USA).
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              Phylogenetic utility of the internal transcribed spacers of nuclear ribosomal DNA in plants: an example from the compositae.

              Bruce Baldwin (1992)
              The internal transcribed spacer (ITS) region of 18-26S nuclear ribosomal DNA was sequenced in 12 representatives of the Compositae subtribe Madiinae and two outgroup species to assess its utility for phylogeny reconstruction. High sequence alignability and minimal length variation among ITS 1, 5.8S, and ITS 2 sequences facilitated determination of positional homology of nucleotide sites. In pairwise comparisons among Madiinae DNAs, sequence divergence at unambiguously aligned sites ranged from 0.4 to 19.2% of nucleotides in ITS 1 and from 0 to 12.9% of nucleotides in ITS 2. Phylogenetic relationships among ITS sequences of Hawaiian silversword alliance species (Argyroxiphium, Dubautia, and Wilkesia) and California tarweed taxa in Adenothamnus, Madia, Raillardella, and Raillardiopsis are highly concordant with a chloroplast DNA-based phylogeny of this group. Maximally parsimonious trees from ITS and chloroplast DNA data all suggest (a) origin of the monophyletic Hawaiian silversword alliance from a California tarweed ancestor, (b) closer relationship of the Hawaiian species to Madia and Raillardiopsis than to Adenothamnus or Raillardella, (c) paraphyly of Raillardiopsis, a segregate of Raillardella, and (d) closer relationship of Raillardiopsis to Madia and the silversword alliance than to Raillardella. These findings indicate that the ITS region in plants should be further explored as a promising source of nuclear phylogenetic markers.
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                Author and article information

                Contributors
                G.A. Bich
                Journal
                Journal ID (nlm-ta): Saudi J Biol Sci
                Journal ID (iso-abbrev): Saudi J Biol Sci
                Title: Saudi Journal of Biological Sciences
                Publisher: Elsevier
                ISSN (Print): 1319-562X
                ISSN (Electronic): 2213-7106
                Publication date PMC-release: 19 May 2016
                Publication date (Print): May 2017
                Publication date (Electronic): 19 May 2016
                Volume: 24
                Issue: 4
                Pages: 851-856
                Affiliations
                [a ]Microbiology and Immunology Laboratory, Misiones National University, 1375, Mariano Moreno Ave., 3300 Posadas, Misiones, Argentina
                [b ]Biotechnology Institute of Misiones “María Ebe Reca”, 12 Road, km 7, 5, 3300 Misiones, Argentina
                Author notes
                [* ]Corresponding author at: Misiones National University, 1375, Mariano Moreno Ave., 3300 Posadas, Misiones, Argentina. Tel.: +54 (0376) 4435118; fax: +54 (0376) 4425414.Misiones National University1375, Mariano Moreno Ave.3300 PosadasMisionesArgentina gustavobich@ 123456gmail.com
                Article
                Publisher ID: S1319-562X(16)30037-7
                DOI: 10.1016/j.sjbs.2016.05.010
                PMC ID: 5415117
                PubMed ID: 28490957
                SO-VID: e41f1428-43d8-46a9-991e-ab9e62f2d2bd
                Copyright © © 2016 The Authors
                License:

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                Date received : 7 August 2015
                Date revision received : 21 April 2016
                Date accepted : 10 May 2016
                Categories
                Subject: Original Article

                Keywords: its,leaf-cutting ants,leucoagaricus,phylogeny
                Data availability:
                Keywords: its, leaf-cutting ants, leucoagaricus, phylogeny

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