Diversidade de fungos micorrícos

Brazilian Journal of Microbiology (2009) 40:111-121
ISSN 1517-8382

OCCURRENCE AND DIVERSITY OF ARBUSCULAR MYCORRHIZAL FUNGI IN TRAP CULTURES
FROM SOILS UNDER DIFFERENT LAND USE SYSTEMS IN THE AMAZON, BRAZIL
Patrícia Lopes Leal1; Sidney Luiz Stürmer2*; José Oswaldo Siqueira3
Departamento de Microbiologia, Universidade Federal de Viçosa, Viçosa, MG, Brasil; 2Universidade Regional de Blumenau,
Departamento de Ciências Naturais, Blumenau, SC, Brasil; 3Universidade Federal de Lavras, Departamento de Ciência de Solo,
Lavras, MG, Brasil
1

Submitted: March 18, 2008; Returned to authors for corrections: October 29, 2008; Approved: February 25, 2009.

ABSTRACT
The aim of this work was to evaluate the occurrence of arbuscular mycorrhizal fungi (AMF) species diversity in soil samples from the Amazon region under distinct land use systems (Forest, Old Secondary Forest,
Young Secondary Forest, Agroforestry systems, Crops and Pasture) using two distinct trap cultures. Traps established using Sorghum sudanense and Vigna unguiculata (at Universidade Regional de Blumenau FURB) and Brachiaria decumbens and Neonotonia wightii (at Universidade Federal de Lavras - UFLA) were grown for 150 days in greenhouse conditions, when spore density and species identification were evaluated.
A great variation on species richness was detected in several samples, regardless of the land use systems from where samples were obtained. A total number of 24 AMF species were recovered using both methods of trap cultures, with FURB´s traps yielding higher number of species. Acaulospora delicata, A. foveata,
Entrophospora colombiana and two undescribed Glomus species were the most abundant and frequent species recovered from the traps. Number of species decreased in each genus according to this order:
Acaulospora, Glomus, Entrophospora, Gigaspora, Archaeospora, Scutellospora and Paraglomus. Spore numbers were higher in Young Secondary Forest and Pastures. Our study demonstrated that