Data/hora: 03/06/2024 00:04:31

Biblioteca(s): | Embrapa Agrobiologia; Embrapa Tabuleiros Costeiros.
Data corrente: | 24/07/1997
Data da última atualização: | 24/07/1997
Autoria: | GARCIA DE SALAMONE, I. E.; DOBEREINER, J.; URQUIAGA, S.; BODDEY, R. M.
Título: | Biological nitrogen fixation in Azospirillum strain-maize genotype associations as evaluated by the 15N isotope dilution technique.
Ano de publicação: | 1996
Fonte/Imprenta: | Biology and Fertility of Soils, Berlin, v. 23, p. 249-256, 1996.
Idioma: | Inglês
Conteúdo: | Few studies of the inoculation of cereal crops with N2-fixing bacteria have included more than one of two plant genotypes. In a recent study performed in Argentina using 12 different maize genotypes, it was found in 2 consecutive field experiments that several of them responded consistently, either negatively or positively, to inoculation with a mixture of strains of Azospirillum spp. The present study in pots was performed to investigate the effect of inoculation of individual strains (and a mixture) of Azospirillum spp., and their nitrate reductase negative (NR-) mutants, on the growth of four of these maize genotypes. Two of these genotypes were grown in 15N-labelled soil with the aim of quantifying and contributions of biological N2 fixation. Two genotypes(Morgan 318 and Dekalb 4D-70= produced similar increases in grain yield when they were inoculated with a mixture of Azospirillum spp. strains or fertilized with the equivalent of 100 kg N ha-1. The other genotypes (Dekalb 2F-11 and CMS 22) showed little response to inoculation or N fertilization. The Morgan 318 and Dekalb 4D-70 genotypes showed a large increase in total mN accumulation, suggesting that the response was due to increased N acquisition, but not the to bacterial nitrate reductase as the NR- mutants generally caused plant responses similar to those of the parent strains. Despite problems with the stabilization of the 15N enrichment in the soil, the 15N isotope dilution results indicated that there were very significant biological nitrogen.....
Palavras-Chave: | Bacteria fixadora; Biological nitrogen; BNF; Diazotrofico; Diazotrophic bacteria; Diazotrophy; FBN; Fixacao; Fixação biologica de nitrogenio; Fixation; Inoculation; Maize; Nitrogen fixing bacteria; Tecnica de diluicao.
Thesagro: | Bactéria; Inoculação; Isótopo; Milho; Zea Mays.
Thesaurus Nal: | Azospirillum; inoculation methods.
Categoria do assunto: | --
Registro original: | Embrapa Agrobiologia (CNPAB)

Exemplares:

CPATC - (16948-1) - ADD - SP - -- -  -  - SP004353 - DIS
CNPAB - (24344-1) - UPC - SP - -- -  -  - 22185 - DIS