Terrestrial and marine Antarctic fungi extracts active against Xanthomonas citri subsp citri

Autor(es)

Vieira, G. ^[1] ; Puric, J. ^[1] ; Morao, L. G. ^[1] ; dos Santos, J. A. ^[1] ; Inforsato, F. J. ^[1] ; Sette, L. D. ^[1] ; Ferreira, H. ^[1] ; Sass, D. C. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP Julio de Mesquita Filh, Inst Biosci, Dept Biochem & Microbiol, Rio Claro, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Letters in Applied Microbiology; v. 67, n. 1, p. 64-71, JUL 2018.
• Citações Web of Science: 3

Resumo

This study aims to obtain secondary metabolites extracts from filamentous fungi isolated from soil and marine sediments from Antarctica and assess its potential antibacterial activity on Xanthomonas citri subsp. citri, the agent of citrus canker. Metabolites production was conducted in Malt 2% broth at 15 degrees C for 20days after which intracellular and extracellular extracts were obtained. The extracts were evaluated by cell viability assays through Resazurin Microtitre Assay. From 158 fungal extracts, 33 hampered bacterial growth invitro. The average inhibition of the extracts obtained from terrestrial (soil) and marine (sediments) fungi was 94 and 97% respectively. These inhibition values were close to the average of 90% cell death for the positive control. MIC90 and MBC for the bioactive extracts were established. Isolates that produced active metabolites against the phytopathogen were identified using molecular taxonomy (ITS-rRNA sequencing) as: Pseudogymnoascus, Penicillium, Cadophora, Paraconiothyrium and Toxicocladosporium. Antarctic fungal strains isolated from terrestrial and marine sediments were able to produce secondary metabolites with antimicrobial activity against X. citri subsp. citri, highlighting the importance of these microbial genetic resources. These metabolites have potential to be used as alternatives for the control of this plant pathogen. Significance and Impact of the StudyThis manuscript makes an impact on the study of micro-organisms from extreme habitats and their possible contribution in discovering new active molecules against pathogens of agricultural interest. Studies on the Antarctic continent and its communities have attracted the scientific community due to the long period of isolation and low levels of disturbance that surrounds the region. Knowing the potential of fungi in this region to produce active secondary metabolites, we aim to contribute to the discovery of compounds with antibacterial action in Xanthomonas citri subsp. citri, a plant pathogen present in several regions around the globe. (AU)

• Processo FAPESP: 15/20629-6 - Potencial biotecnológico de metabólitos secundários de fungos da Antártica com atividade contra bactérias fitopatogênicas.
• Beneficiário: Daiane Cristina Sass
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/07957-7 - Micologia marinha e Antártica: diversidade e aplicação ambiental
• Beneficiário: Lara Durães Sette
• Modalidade de apoio: Auxílio à Pesquisa - Regular