Use este identificador para citar ou linkar para este item: http://repositorio.inpa.gov.br/handle/123/3761
Título: SPEED OF NODULATION AND COMPETITIVE ABILITY AMONG STRAINS OF RHIZOBIUMLEGUMINOSARUM BV PHASEOLI.
Autor(es): P.H. GRAHAM
Luiz Antonio de Oliveira
Assunto: FIXACAO BIOLOGICA DO NITROGENIO
NODULACAO
RIZOBIA
ISSN: -
Revista: ARCHIVES OF MICROBIOLOGY
Volume: 153
Resumo: This study examines the speed of nodulation of 20 strains of Rhizobium leguminosarum bv phaseoli, and relates this trait to the competitive performance of these strains with Phaseolus vulgaris L. At 25/20°C day/night temperature, and with 107 cells applied per growth pouch, there was a strong positive correlation between the speed of nodulation and the competitiveness of strains with the nod + fix− reference strain UMR 1116. Strains UMR 1084, 1125, 1165, 1173 and 1384 combined good competitive performance with extensive nodulation in the uppermost root regions. When inoculant levels in the RTM studies were reduced to 103 cells per pouch no correlation between the apparent competitiveness of strains and their speed in nodulation was evident, presumably because cells had to undergo multiplication before infection. Nodulation was also delayed when growth temperatures were raised to 31/26°C, but a correlation was still evident between competitive performance and nodulation in the region 0.1 to 5.0 mm below the RTM at the time of inoculation. From these results speed of nodulation can be used to estimate the competitive potential of Rhizobium strains, but only under carefully regulated conditions. The effects of inoculation level and temperature on the relationship between speed of nodulation and strain competitiveness could explain the inconsistent results obtained in earlier studies on this topic.
URI: http://repositorio.inpa.gov.br/handle/123/3761
ISSN: -
DOI: http://dx.doi.org/10.1007/BF00248998
Aparece nas coleções:Coordenação de Tecnologia e Inovação (COTI)

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