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Characterization of fungal soil communitirs by F-RISA and arbuscular mycorrhizal fungi from araucária angustifolia florest soils after replantion and widfire disturbances

Grant number: 08/11003-2
Support type:Regular Research Grants - Publications - Scientific article
Duration: January 01, 2009 - June 30, 2009
Field of knowledge:Agronomical Sciences - Agronomy
Principal Investigator:Elke Jurandy Bran Nogueira Cardoso
Grantee:Elke Jurandy Bran Nogueira Cardoso
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

The Fungal Ribosomal Intergenic Spacer Analysis (F-RISA) was used to characterize soil fungal communities from threeecosystems of Araucaria angustifolia from Brazil: a native forest and two replanted forest ecosystems, one of them with apast history of wildfire. The arbuscular mycorrhizal fungi (AMF) infection was evaluated in Araucaria roots of 18-montholdaxenic plants previously inoculated with soils collected from those areas in a greenhouse experiment. The principalcomponent analysis of F-RISA profiles showed different soil fungal community between the three studied areas. Sixty threepercent of F-RISA fragments amplified in the soil and the substrate samples presented lengths between 500 and 700 bp. Thenumber of Operational Taxonomic Units (OTUs) was 34 for soil and 38 for substrate, however, more fragments weredetected in soil (214) than in substrate (163). An in silico F-RISA analysis to compare our data with ITS1-5.8S-ITS2sequences from NCBI database showed the presence of Ascomycota, Basidiomycota and Glomeromycota among the soiland substrate fungal communities. AMF infection was higher in plants inoculated with soil from the native forest and thereplanted forest with wildfire, both presenting similar chemical characteristics but with different disturbance levels. Theseresults indicate that soil chemical composition may influence the soil fungal community structures rather than theanthropogenic or fire disturbances. (AU)

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