Fungos MicorrÃzicos arbusculares (glomeromycota) em fragmentos de mata atlÃntica no centro de endemismo Pernambuco

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

â (Arbuscular mycorrhizal fungi (Glomeromycota) in fragments of Atlantic Forest in the Pernambuco Endemism Center). The Atlantic Forest is well known for its high biological diversity but now is extremely disturbed. The arbuscular mycorrhizal fungi (AMF) affect the floristic composition, the stabilization of natural systems, being an important element on soil aggregation, throughly production of specific compounds, and nutrient cycle. The aim of this work was to know the diversity, similarly and infectivity of AMF in two areas (Usinas Frei Caneca and Serra Grande) divided, each one, in four fragments. Samples of rhizospheric soil were collected at random from six points, inside and at the border of these fragments. Spores of AMF were extracted from soil, quantified and identified. The infectivity of AMF in the soil was determined using four dilutions (0, 1:10, 1:100, 1:1000), with five replicates, with Zea mays as host. After 35 days, presence of AMF structures was measured. Glomalin was quantified by the Bradfordâs method. Seventeen species of AMF representing five genera were found: Acaulospora (5), Archaeospora (1) Entrophospora (1), Gigaspora (1), Glomus (7) and Scutellospora (2). Ten and 12 species of AMF were registered, respectively, in Serra Grande and Frei Caneca, with 45% of similarity between these areas. Apparently there was no border effect on distribution of spores of AMF in these areas. The MPN of infective propagules of AMF varied from 4.5 to >2,400 propagules.cm-3. The highest values of glomalin occurred in Frei Caneca, reaching 22.21mg.g-1 soil, what has been considered a high level, when compared to other systems. In general, higher density of spores, MPN of infective propagules of AMF and production of glomalin were registered in Frei Caneca, although not always with significative differences.

ASSUNTO(S)

micorriza arbuscular glomalin glomalina mata atlÃntica micologia arbuscular mycorrhiza atlantic forest

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