PHOSPHORUS DOSES DETERMINE THE PREVALENCE OF NATIVE ARBUSCULAR MYCORRHIZAL FUNGI IN Araucaria angustifolia

• Main Authors: Milene Moreira, Dilmar Baretta, Elke Jurandy Bran Nogueira Cardoso
• Format: Article
• Language: Portuguese
• Published: Universidade Federal de Santa Maria 2012-12-01
• Series: Ciência Florestal
• Subjects: FMA; diversidade; densidade de esporos; pinheiro brasileiro
• Online Access: http://cascavel.ufsm.br/revistas/ojs-2.2.2/index.php/cienciaflorestal/article/view/7562
• ISSN: 0103-9954; 1980-5098

http://dx.doi.org/10.5902/198050987562<br /><br />A greenhouse experiment was installed with bait cultures to extract the AMF species present in a rhizosphere soil sample of a native Araucaria angustifolia forest in Campos do Jordão, Brazil. The experimental design was completely randomized, with four increasing phosphorus doses (0, 20, 50, and 150 mg kg-1, as triple superphosphate), with five replicates, the bait plant was araucaria, and all pots were inoculated with 100g of rhizospheric soil collected in an araucaria forest. After twelve months the spores were extracted, counted and identified, and the percent root colonization was also determined. When taking all four P doses into account, eleven FMA species could be identified: Acaulospora bireticulata, A. morrowiae, Acaulospora sp., Entrophospora colombiana, Gigaspora margarita, Glomus diaphanum, G. etunicatum, G. macrocarpum, Scutellospora calospora, S. gilmorei, and S. pellucida. There was no effect of the P dose on the total amount of spores neither on the percent root colonization. However, the correspondence analysis showed that the different AMF species were selectively associated mostly to either one or another P dose.