Selective isolation of dematiaceous fungi from the workers of Atta laevigata (Formicidae: Attini)

Autor(es)

Guedes, F. L. A. ^[1] ; Attili-Angelis, D. ^[1] ; Pagnocca, F. C. ^[1]

Afiliação do(s) autor(es)

^[1] UNESP Sao Paulo State Univ, Ctr Study Social Insects, BR-13506900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Folia Microbiologica; v. 57, n. 1, p. 21-26, JAN 2012.
• Citações Web of Science: 9

Resumo

Leaf-cutting ants (Formicidae: Attini) are considered pests in agriculture for their impact in human crops, as they utilize leaf fragments to raise their fungal mutualist (Agaricales: Lepiotaceae). Basically, the basidiomycetous fungus is cultivated to supply food to adult workers and broads; in return, the ants protect it against natural enemies. However, recent studies have claimed that other microorganisms are associated to ant nests where a wide range of interactions may take place. To investigate the occurrence of dematiaceous fungi on the cuticle of Atta laevigata ants, 30 workers were sampled from an adult nest located in the surroundings of the Center for the Studies of Social Insects, UNESP-Rio Claro, SP, Brazil. The use of selective techniques to avoid high-sporulation fungi has been recommended and was tested in this study. To favor the isolation of the desired fungi, heads and cuticle scrapings of ant bodies were inoculated on Mycosel agar and incubated for 3 weeks at 35A degrees C. Morphological and molecular methods were used to identify the filamentous fungi recovered. From 56 isolates, 19 were hyaline filamentous species, and among the remaining 37, some are mentioned as phyto-associated fungi like Alternaria arborescens, Bipolaris sorokiniana, Bipolaris eleusines, Bipolaris zeae, Curvularia trifolii, and Paraphaeosphaeria michotii. These species are reported from A. laevigata bodies for the first time. None of the isolation trials revealed the presence of the parasite Escovopsis or entomopathogenic fungi. The possible spread of the fungi in nature by the ants is discussed. (AU)

• Processo FAPESP: 09/10001-9 - Fungos melanizados associados a formigas cortadeiras (Formicidae: tribo Attini)
• Beneficiário: Fábio Lúcio Antunes Guedes
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica