Use este identificador para citar ou linkar para este item: http://repositorio.inpa.gov.br/handle/123/3739
Título: NODULATION OF LEGUMES, NITROGENASE ACTIVITY OF ROOTS AND OCCURENCE OF NITROGEN-FIXING AZOSPIRILLUM SPP. IN REPRESENTATIVE SOILS OF CENTRAL AMAZONIA
Autor(es): SYLVESTER-BRADLEY
PODESTA FILHO
J.A.
STA. JONH
T.V.
Luiz Antonio de Oliveira
Assunto: NODULACAO
FIXACAO BIOLOGICA DO NITROGENIO
ISSN: -
Revista: AGRO-ECOSYSTEMS
Volume: 6
Resumo: Leguminosae do not predominate in the Brazilian Amazon rain forest, although they are among the five best represented families. Plant roots from various soils were examined for the presence of nodules, acetylene-reducing activity and N(,2)-fixing Azospirillum spp. Abundant nodulation was found in black earth ("terra preta dos indios") and in one case on sandy soil under campinarana vegetation along a tributary of the upper Rio Negro. Nodules were not found on plants from many other soils and sites in this area, nor in primary or secondary forest on clayey latosol near Manuas. In sandy latosol some nodules occurred in secondary forest and fewer in primary forest. Legumes in disturbed clayey or sandy latosol showed more frequent nodulation. Primary forest on alluvial ("varzea") soil, and in Bahia coastal rain forest on sandy latosol and Erythrina glauca used for shaing cacao plantations were abundantly nodulated. Acetylene reduction assays showed no, or very little, nitrogenase activity of roots from primary or secondary forest on clayey latosol near Manaus. Nodulated roots from secondary forest on sandy latosol showed acetylene-reducing activity. High rates of acetylene reduction were observed in nodulated roots of primary forest on alluvial "varzea" soil. Root samples showed ethylene absorption in controls without acetylene which might interfere with the results of acetylene reduction tests. The incidence of Azospirillum was also higher in black earth than
URI: http://repositorio.inpa.gov.br/handle/123/3739
ISSN: -
Local de publicação: Estados Unidos
Aparece nas coleções:Coordenação de Tecnologia e Inovação (COTI)

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