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Microbial Communities in Different Tissues of Atta Sexdens Rubropilosa Leaf-Cutting Ants

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Microbial Communities in Different Tissues of Atta Sexdens Rubropilosa Leaf-Cutting Ants Curr Microbiol (2017) 74:1216–1225 DOI 10.1007/s00284-017-1307-x Microbial Communities in Different Tissues of Atta sexdens rubropilosa Leaf-cutting Ants 1 1 2 1 Alexsandro S. Vieira • Manuela O. Ramalho • Cintia Martins • Vanderlei G. Martins • Odair C. Bueno1 Received: 6 February 2017 / Accepted: 11 July 2017 / Published online: 18 July 2017 Ó Springer Science+Business Media, LLC 2017 Abstract Bacterial endosymbionts are common in all were Burkholderiales, Clostridiales, Syntrophobacterales, insects, and symbiosis has played an integral role in ant Lactobacillales, Bacillales, and Actinomycetales (midgut) evolution. Atta sexdens rubropilosa leaf-cutting ants cul- and Entomoplasmatales, unclassified c-proteobacteria, and tivate their symbiotic fungus using fresh leaves. They need Actinomycetales (postpharyngeal glands). The high abun- to defend themselves and their brood against diseases, but dance of Entomoplasmatales in the postpharyngeal glands they also need to defend their obligate fungus gardens, (77%) of the queens was an unprecedented finding. We their primary food source, from infection, parasitism, and discuss the role of microbial communities in different tis- usurpation by competitors. This study aimed to character- sues and castes. Bacteria are likely to play a role in ize the microbial communities in whole workers and dif- nutrition and immune defense as well as helping antimi- ferent tissues of A. sexdens rubropilosa queens using Ion crobial defense in this ant species. Torrent NGS. Our results showed that the microbial com- munity in the midgut differs in abundance and diversity Keywords Attini Á Endosymbiont Á Entomoplasmatales Á from the communities in the postpharyngeal gland of the Next-generation sequencing queen and in whole workers. The main microbial orders in whole workers were Lactobacillales, Clostridiales, Enter- obacteriales, Actinomycetales, Burkholderiales, and Bacillales. In the tissues of the queens, the main orders Introduction Ants (Hymenoptera: Formicidae) represent a third of the & Alexsandro S. Vieira insect biomass in the tropical rainforests of South America, [email protected] with more than 13,000 species separated into different Manuela O. Ramalho evolutionary branches that have had great ecological suc- [email protected] cess [2, 19]. Symbiosis can be considered one of the Cintia Martins driving forces in ant evolution and diversification [email protected] [3, 28, 37]. Over the course of their 115–168-million-year Vanderlei G. Martins history [7, 28], these diverse and ecologically dominant [email protected] insects have repeatedly evolved symbiotic relationships Odair C. Bueno with sap-feeding insects [40], plants [17], and microbes [email protected] [5, 29, 56]. For instance, fungus-growing attines have obligate and ancient mutualisms with basidiomycete fungi 1 Centro de Estudos de Insetos Sociais, UNESP - Univ (approximately 50 million years BP [30, 41]); not only do Estadual Paulista, Campus Rio Claro, Av. 24A, 1515, Bela Vista, Rio Claro, Sa˜o Paulo 13506-900, Brazil these ants defend themselves and their brood against dis- eases, but they also defend their primary food source, 2 Universidade Federal do Piauı´ - Campus Ministro Reis Velloso, Av. Sa˜o Sebastia˜o, 2819, Parnaı´ba, obligate fungus gardens, from infection, parasitism, and Piauı´ 64.202-020, Brazil usurpation by competitors [18]. 123 Microbial Communities in Different Tissues of Atta sexdens rubropilosa Leaf-cutting Ants 1217 Endobacteria may play a role in the host’s biological proventriculus functions as a micropore filter, blocking the system. For example, carpenter ants harbor Blochmannia entry of bacteria and particles C0.2 lm into the midgut and species that are responsible for nitrogen recycling and hindgut, while allowing dissolved nutrients through, thus nutrient upgrading [13]. However, interactions between protecting the gut microbiome from disruption [26]. As a bacteria and herbivorous and fungivorous ants have not result, different parts of the digestive system have different been extensively explored, although they are thought to bacterial communities. have played a key role in the success of these ants [5, 37]. Next-generation sequencing is an excellent tool to Actinomycetes (phylum Actinobacteria) are the best- characterize the microbial communities associated with studied bacterial symbionts of the higher fungus-growing insects. This study aimed to characterize the microbial ants. One example is genus Pseudonocardia, which pro- communities in whole workers and different tissues of the duces antibiotics against numerous bacterial and fungal queen of A. sexdens rubropilosa using Ion Torrent NGS. microbes [31, 36, 42, 57]. These metabolites are narrow- The queens were chosen for the study because they belong spectrum antimicrobials that are active against Escovop- to the reproductive caste and are responsible for vertical sis, a potentially virulent, specialized fungus that attacks microbiome transmission, whereas the workers were the ants’ mutualistic fungus [7, 8]. Several other bacterial chosen because they belong to a sterile caste. This study symbionts may be involved in the defense against para- of the microbiome may provide answers on the ability of sites and diseases, in addition to having other roles. fungi-forming ants to control pathogens since we already Examples include Streptomyces species associated with know that the main function of the metapleural gland is to Acromyrmex octospinosus [4, 20, 44, 45], Amycolatopsis produce antibiotic compounds, but little is known about in Mycocepurus smithii workers [42], and Burkholderia in how bacteria could contribute to the defense antimicrobial fungus gardens of A. sexdens rubropilosa [46]. Atta and activity of ants. We hypothesized that whole workers and Acromyrmex are derived attines and present the well-de- queens would have different microbial communities, and veloped metapleural gland in relation to basal fungus- that the community in the midgut would differ from the growing attines [52, 53]; this gland produces antibiotic community in the postpharyngeal gland of the foregut; compounds that inhibit pathogens. However, which bac- this gland was thought to be exclusive to Formicidae [11], teria would be assisting the antimicrobial defense of A. but Herzner and collaborators [18] found them in the sexdens rubropilosa? solitary wasps. Recently, Decio and collaborators [10] Only a few studies used next-generation sequencing defined this gland as a diverticulum of the anterior (NGS) techniques to study microbial communities in fun- intestine with the ability to absorb, store, metabolize, and gus-growing ants. Kellner et al. [24] used pyrosequencing mobilize lipids to the hemolymph [54], so this study to describe the bacterial community in M. smithii, a lower investigated whether PPG, which belongs to the digestive fungus-growing ant, and found a low abundance of acti- tract, differs from its microbial communities in relation to nomycete bacteria. Instead, the bacterial community was the midgut. characterized by a high abundance of Lactobacillus and Pantoea, both in the garden and in worker ants. In Tra- chymyrmex septentrionalis ants, 454 sequencing revealed a Materials and Methods diverse group of associated Actinobacteria, most notably Solirubrobacter, Pseudonocardia, and Microlunatus [22]. Three whole workers from three different colonies were Meirelles et al. [32] used Illumina sequencing to study the collected to create a DNA pool. In addition, the queens microbiome in workers of the leaf-cutter ant Atta texana, from the same three colonies were dissected to extract the and found that Pseudomonas, Acinetobacter, Propionibac- midgut (MD) and postpharyngeal gland (PPG) to create terium and Corynebacterium were consistently abundant, two additional DNA pools. All colonies were collected and that some pellet and ant samples had a high abundance from a pine reforestation area in Itirapina, SP, Brazil (S of Mesoplasma bacteria (clade Entomoplasmatales). 22°1404200,W47°5003400). Individuals were placed in 95% Sapountzis et al. [47] found that Acromyrmex leaf-cut- ethanol until further processing. ting ants have simple gut microbiota (Rhizobiales) with nitrogen-fixing potential. In non-fungus-growing ants, several symbiotic bacteria grow in the ant gut, which is DNA Extraction and Sequencing inhabited by a wide range of microorganisms [1, 23, 26, 37, 48]. The composition of the gut bacterial For DNA extraction, all specimens (workers and queens) community varies among ant taxa and across trophic were anesthetized by cooling (4 °C) and subjected to levels [11], as well as between tissues [26]. In the Sonoran ultrasonic cleaning for 1 min. The queens were dissected in Desert turtle ant Cephalotes rohweri, for instance, the a Petri dish containing an insect saline solution (0.128 M 123 1218 A. S. Vieira et al. NaCl, 0.016 M Na2HPO4, 0.019 M KH2PO2, pH 7.2); the (transformed and standardized) using the MG-RAST MD and PPG were removed under a stereomicroscope. analysis tool, so that the values of all samples were Total DNA pools were extracted from: (a) whole rescaled from 0 (minimum value) to 1 (maximum value). workers (WW), (b) the midguts of the queens (MD), and This is important for meaningful comparisons between (c) the postpharyngeal glands of the queens (PPG). Dis- samples. The RDP server was also used to estimate rich- sected organs were sonicated and incubated at 55 °C for ness and diversity indices (Chao1, Shannon, and evenness)
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