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Redalyc.Isolation and Molecular Characterization of Symbiotic Fungus from Acromyrmex Ambiguus and Acromyrmex Heyeri Ants Of

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Redalyc.Isolation and Molecular Characterization of Symbiotic Fungus from Acromyrmex Ambiguus and Acromyrmex Heyeri Ants Of Ciência Rural ISSN: 0103-8478 [email protected] Universidade Federal de Santa Maria Brasil Brayer Pereira, Daniela Isabel; de Avila Botton, Sônia; de Azevedo, Maria Isabel; Urach Monteiro, Danieli; Weiblen, Carla; Schopt Machado, Vanessa; Guimarães Donatti, Michele; Loeck, Alci Enimar Isolation and molecular characterization of symbiotic fungus from Acromyrmex ambiguus and Acromyrmex heyeri ants of Rio Grande do Sul State, Brazil Ciência Rural, vol. 45, núm. 7, julio, 2015, pp. 1256-1261 Universidade Federal de Santa Maria Santa Maria, Brasil Available in: http://www.redalyc.org/articulo.oa?id=33139460017 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Ciência1256 Rural, Santa Maria, v.45, n.7, p.1256-1261, jul, 2015 Pereira et al. http://dx.doi.org/10.1590/0103-8478cr20141064 ISSN 0103-8478 MICROBIOLOGY Isolation and molecular characterization of symbiotic fungus from Acromyrmex ambiguus and Acromyrmex heyeri ants of Rio Grande do Sul State, Brazil Isolamento e caracterização molecular do fungo simbionte de formigas-cortadeiras (Acromyrmex heyeri e Acromyrmex ambiguus) do Rio Grande do Sul, Brasil Daniela Isabel Brayer PereiraI Sônia de Avila BottonII Maria Isabel de AzevedoII Danieli Urach MonteiroII Carla WeiblenII Vanessa Schopt MachadoII Michele Guimarães DonattiIII Alci Enimar LoeckIII ABSTRACT dependentes obrigatórias da simbiose com Leucoagaricus gongylophorus. O objetivo deste estudo foi identificar Leaf-cutting ants of the genera Atta and Acromyrmex morfologicamente e molecularmente, bem como verificar a determine serious agricultural problems and live on symbiosis variabilidade genotípica do fungo simbionte, cultivado por with Leucoagaricus gongylophorus. The aim of this study is to Acromyrmex heyeri e Acromyrmex ambiguus em três regiões identify morphological and molecularly, as well as to verify the do RS, Brasil. Jardins de fungo foram coletados do interior de genotypic variability of the symbiotic fungus cultivated by A. formigueiros e fragmentos de micélio foram cultivados em meio heyeri and A. ambiguus from three different regions of the state de cultura seletivo. O DNA total foi extraído e a amplificação da of Rio Grande do Sul, Brazil. Fungus gardens were collected and região ITS foi realizada por PCR, utilizando primers universais. fragments of mycelia were grown in selective medium. Total DNA Após sequenciamento, os cromatogramas foram montados e as was extracted and amplification of the ITS region was performed análises filogenéticas foram realizadas pelo método de Neighbor- by PCR using universal primers. After DNA sequencing, the Joining. Dos jardins de fungo, obtiveram-se seis isolados de L. chromatograms were assembled and phylogenetic analyzes gongylophorus, confirmados por análise molecular. A análise were performed by the Neighbor-Joining method. A total of six filogenética da região ITS mostrou uma árvore com dois grupos isolates of L. gongylophorus were obtained and their identities distintosem relação aos isolados do fungo oriundos de ninhos de A. were confirmed by molecular analyses. Phylogenetic analysis of heyeri e A. ambiguus. Neste estudo, evidenciou-se que as espécies the ITS region showed a tree with two distinct groups regarding de formigas A. heyeri e A. ambiguus cultivam o mesmo fungo. the fungus isolates from A. heiyeri and A. ambiguous. In this Entretanto, o marcador molecular estudado evidenciou variações study, it was verified that A. heyeri and A. ambiguous, cultivate de L. gongylophorus que permitiram formar duas ramificações the same fungus. Additionally, the molecular marker used in diferentes na árvore filogenética relacionada à espécie de formiga this study showed variations in L. gongylophorus, evidencing que o cultiva. Todavia, para validar as possíveis variações nas two distinct branches in the phylogenetic tree, according to the relações filogenéticas deste fungo simbionte, é necessária a ant species that cultivate L. gongylophorus. However, other inclusão de um maior número de isolados de L. gongylophorus, studies involving the inclusion of a great number of isolates of L. bem como o emprego de outros marcadores moleculares. gongylophorus, as well as the use of other molecular markers to validate the possible variations in the phylogenetic relationship Palavras-chave: Basidiomicetos, Leucoagaricus gongylophorus, of this symbiotic fungus are required. internal transcribed spacer. Key words: Basidiomycete, Leucoagaricus gongylophorus, internal transcribed spacer. INTRODUCTION RESUMO Formigas-cortadeiras dos gêneros Atta e Leaf-cutting ants belong to the family Acromyrmex causam elevados prejuízos à agricultura e são Formicidae which are grouped in the Attine tribe IDepartamento de Microbiologia e Parasitologia, Instituto de Biologia, Universidade Federal de Pelotas (UFPel), 96010-900, Pelotas, RS, Brasil. E-mail: [email protected]. Corresponding author. IIDepartamento de Medicina Veterinária Preventiva, Centro de Ciências Rurais (CCR), Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brasil. IIIDepartamento de Entomologia, Faculdade de Agronomia, UFPel, Pelotas, RS, Brasil. Received 07.17.14 Approved 12.10.14 Returned by the author 04.13.15 CR-2014-1064.R1 Ciência Rural, v.45, n.7, jul, 2015. Isolation and molecular characterization of symbiotic fungus from Acromyrmex ambiguus and Acromyrmex heyeri... 1257 and included in the sub-family Myrmicinae. The MATERIAL AND METHOD Attine ants are found only in Neotropical regions and are distributed between southern South America The research was performed with the and the southern United States (MEHDIABADI & species A. heyeri (narrow leaf cutter) and A. SCHultZ, 2010). The genera Atta and Acromyrmex ambiguus (cutter broadleaf) covering three regions stands out due to the damage they cause, both in of the state of Rio Grande do Sul: South region, in native plants and at cultivated plants, in which they the city of Pelotas (Latitude: 31º46’19”S - Longitude: cut fresh material that serves as a substrate for the 52º20’33”W), campaign region in the city of Bage cultivation of the symbiotic fungus inside their nests (Latitude: 31º19’53” S - Longitude: 54º06’25”W) (CHAPELLA et al., 1994; MUELLER et al., 2001). and Central region, in the municipality of Santa Maria All Attine ants (that includes about 256 described (Latitude: 29º41’03”S-Longitude:53º48’25”W). In species in 15 genera) (SOSA-CALVO et al., 2013) each area, fungi garden of four nests of both ant species are mandatory dependent on this symbiosis, which studied were collected. Fragments of mycelia were involves Lepiotaceaeous fungi (order Agaricales, transferred to Petri plates containing Yeast Nitrogen Basidiomycota division) (CHAPELA et al., 1994). Base Glucose Chloramphenicol culture media This fungus is considered of monophyletic origin, (YNBGC). The plates were incubated at 25°C for 30 having co-evolved with the ants for 50 million years days. Colonies suspected of having Leucoagaricus through vertical transmission (CHAPELA et al., spp. were micromorphologic evaluated for their 1994; MUELLER et al., 2001). characteristics (presence of gongylidium) and The symbiosis between ants and their picked into Petri dishes containing the same medium fungus has been subject of many studies involving YNBGC without chloramphenicol (YNBG) biochemical (BORBA et al., 2006; BACCI JR In order to obtain the total DNA, about et al., 2013), metabolic and molecular aspects 100mg of mycelium grown on YNBG agar was (SILVA-PINHATI et al., 2004).The results of this collected and frozen in liquid nitrogen over night research demonstrate mostly that different species (~16h). Total DNA was extracted according to of leaf-cutting ants cultivate only Leucoagaricus the protocol described by MOLLER et al. (1992) gongylophorus as a single species of symbiotic and KLASSEN et al. (1996) with modifications fungus (Silva-PINHATI et al., 2004; POULSEN (BOTTON et al., 2011), and the frozen isolates were & BOOMSMA, 2005). However, they could present macerated in a buffer lysis (beta 2-mercaptoethanol, two different strains (Silva-PINHATI et al., 2004). 2% SDS), 10% CTAB and 5N NaCl, followed by Moreover, the behavioral characteristics of fungal phenol extraction and the total DNA was resuspended growth cultivated for different ants species differ in sterile TE. The total DNA concentrations were in different culture media (LOECK et al., 2004; determined using spectrophotometry. Amplification BORBA et al., 2006), and the foraging habits of of the ITS region (intergenic transcribed spacer of different species of leaf cutting ants suggest that the ribosomal RNA), containing partial gene fragments symbiotic fungus can present nutritional differences of the spacer regions 1 and 2 of the internal (BORBA et al., 2006). transcribed and the region corresponding to the In Rio Grande do Sul, the main spacing between the 5.8S ribosomal DNA gene was species of leaf-cutting ants belong to the performed by PCR using the universal primers ITS1 genus Acromyrmex, and plenty of the species (5’-GTAGTCATATGCTTGTCTC-3’) and ITS4 to Acromyrmex heyeri and Acromyrmex (5’CTTCCGTCAATTCCTTTAAG-3’) (WHITE et ambiguus. The first uses monocotyledonous al., 1990). All reactions were performed in a total leaves, while the second uses dicotyledonous volume of 50µl containing: 20 pmol
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