Fungos isolados da rizosfera de plantios de melÃo (Cucumis melo L. cv. Gold Mine) adubados com compostos orgÃnicos, destacando os solubilizadores de fÃsforo

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The rhizosphere is the region of the soil influenced by the roots, which make nutrients available through the exsuded, intensely affecting the activity and the development of the microrganisms. Amongst those, the P-solubilizers stand out, considered of great importance in the rhizosphere for possessing the ability to make available, for the plants, the insoluble phosphate present in composts. Rhizospheric soil samples were collected in cultivated areas of melon (Cucumis melo cv. Gold Mine) and fertilized with organic composts, in the region of the San Francisco Valley, Petrolina, Pernambuco, with the objective of knowing the diversity of filamentous fungi and to evaluate them as to the ability of P-solubilization. The isolation of the fungi was carried out by the serial dilution technique. The plates were kept at room temperature (28Â1 ÂC) and the growth of the fungi was observed until 72 h. The identification of the species was performed by the observation of macroscopic characteristics of the colony and microscopic aspects of the fungi. In order to evaluate the capacity of the filamentous fungi as P-solubilizers, mycelium discs were poured in Petri dishes containing the culture medium GAGES. A total of seventy-eight species was isolated and identified, belonging to the genera Alternaria, Aspergillus, Chaetomium, Cladosporium, Curvularia, Emericella, Eupenicillium, Eurotium, Fusarium, Humicola, Monodictys, Myrothecium, Neocosmospora, Paecilomyces, Penicillium, Rhizopus, Scopulariopsis, Scytalidium, Sordaria, Talaromyces, Thielavia, Torula and Trichoderma, besides representatives of Aphyllophorales and Mycelia sterilia. Of the 318 fungi samples evaluated, only 52 presented capacity to P-solubilize: Aphyllophorales (02), Aspergillus (34), Penicillium (10) and Rhizopus (06). The results contribute for the knowledge of the P-solubilizing species in soils of the region and to subsidize researches that evaluate the capacity of fungi in the solubilization of applied phosphate fertilization in the culture of melon

ASSUNTO(S)

meloeiro microrganisms fertilization microrganismos semi-arid melon tree adubaÃÃo micologia semi-Ãrido san francisco valley vale do sÃo francisco

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