Diversity of diazotroph populations in the rhizosphere of maize (Zea mays L.) growing on different French soils

Autor: Odile Berge, J. Balandreau, T. Heulin
Přispěvatelé: Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 1991
Předmět:
Zdroj: Biology and Fertility of Soils
Biology and Fertility of Soils, Springer Verlag, 1991, 11, pp.210-215. ⟨10.1007/BF00335769⟩
ISSN: 1432-0789
0178-2762
Popis: International audience; 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 frequently 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 maizerhizosphere-associated bacterium and a potential plant growth-promoting rhizobacterium.
Databáze: OpenAIRE
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