Data/hora: 08/06/2024 06:38:06

Biblioteca(s): | Embrapa Mandioca e Fruticultura; Embrapa Tabuleiros Costeiros.
Data corrente: | 24/05/1993
Data da última atualização: | 26/08/1998
Autoria: | BERGE, O.; HEULIN, T.; BALANDREAU, J.
Título: | Diversity of diazotroph populations in the rhizosphere of maize (Zea mays L.) growing on different french soils.
Ano de publicação: | 1991
Fonte/Imprenta: | Biology and Fertility of Soils, v.11, p.210-215, 1991.
Idioma: | Inglês
Conteúdo: | We studied the dominant diazotrophs associated with maize roots and rhizosphere soil originating from three different locations in France. An aseptically grown maize plantlet, the "spermosphere model", was used to isolate N2-fixing (acetylene-reducing) bacteria. Bacillus circulans was the dominant N2-fixing bacterium in the rhizosphere of maize-growing soils from Ramonville and Trogny, but was not found in maize-growing sandy soil from Pissos. In The latter soil, Enterobacter cloacae, Klebsiella terrigena, and Pseudomonas sp. were the most abundant diazotrophs. Azospirillum sp., which has been freguently reported as an important diazotroph accociated with the maize rhizosphere, was not isolated from any of these soils. The strains were compared for their acetylene-reducing activity in the spermosphere model. The Bacillus circulans strains, which were more frequently isolated, also exhibited significantly greater acetylene-reducing activity (3100 nmol ethylene day -1 plant -1) than the Enterobacteriaceae strains (180 nmol ethylene day -1 plant -1). This work indicates for the first time that Bacillus circulans is an important maize-rhizosphere-associated bacterium and a potential plant growth-promoting rhizobacterium.
Palavras-Chave: | Diazotroph populations; Diversificacao; Diversity; Fixacao; Maize; Populacao diazotropica.
Thesagro: | Milho; Nitrogênio; Zea Mays.
Thesaurus Nal: | Bacillus circulans; Enterobacteriaceae; nitrogen fixation; rhizosphere.
Categoria do assunto: | --
Registro original: | Embrapa Tabuleiros Costeiros (CPATC)

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CPATC - (16887-1) - ADD - SP - -- -  -  - SP004292 - DIS
CNPMF - (15272-1) - ADC - SP - -- - S5519 -  - S5519 - DIS