Intrinsic antibiotic resistance in relation to colony morphology in three populations of West African cowpea rhizobia

Sinclair, M. J.; Eaglesham, A. R. J.

doi:10.1016/0038-0717(84)90009-9

Cited by 32 publications

(12 citation statements)

References 10 publications

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“…All rhizobial strains exhibited high sensitivity to gentamicin, as compared to streptomycin. Similar variations in IAR pattern among strains of fast growing rhizobia were reported earlier by several workers (Graham, 1963;Pankhurst, 1977;Hagedorn, 1979;McLaughlin and Ahmad, 1984;Sinclair and Eaglesham, 1984). The variation pattern in intrinsic antibiotic resistance (IAR) level has been used successfully to differentiate rhizobial strains of common bean (Josey et al, 1979;Beynon and Josey, 1980).…”

Section: Discussionsupporting

confidence: 71%

Physiological behavior and antibiotic response of soybean (Glycine max L.) nodulating rhizobia isolated from Indian soils

Singh¹,

Jaiswal²,

Vaishampayan³

et al. 2013

Afr. J. Microbiol. Res.

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A total of 92 soybean nodulating rhizobia were isolated from different agro regions and screened for sensitivity against 8 rhizobiophages. Only 33 showed susceptibility with phage strains. Nineteen rhizobial isolates selected, including 9 isolates having high lytic behaviour and 10 resistant to all phages, were subjected to study on symbiotic effectiveness. Strains ALSR12, KNSR16, USDA123 and USDA94 showed highly significant interaction with host plant grown under axenic conditions. Strains USDA123 and ANSR12 had distinct lytic reaction with phage strain SR1 and SR2, respectively. Plaques formed by SR1 on USDA123 were quite clear with sharp margin, whereas central halo was surrounded by turbid concentric by SR2 on strain ALSR12. In view of generation time varying from 9.2 h (USDA94) to 12.6 h (ALSR12), they were marked as slow grower. Of the different carbon sources used, arabinose served as a potent carbon source for supporting highest growth of these strains. As compared to the other strain, ALSR12 was able to grow at 45°C and capable to tolerate a higher range of acidity and alkalinity. Strains ALSR12 and USDA123 showed highest resistance level with the antibiotics streptomycin and gentamicin, respectively. Ex-planta N 2 -ase activity was determined only in USDA94 and ALSR12. This study provides means for conducting a systematic and scientific investigation towards obtaining a reliable understanding of the bradyrhizobial diversity in terms of their physiological behaviour.

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Section: Discussionsupporting

confidence: 71%

Physiological behavior and antibiotic response of soybean (Glycine max L.) nodulating rhizobia isolated from Indian soils

Singh¹,

Jaiswal²,

Vaishampayan³

et al. 2013

Afr. J. Microbiol. Res.

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“…O isolado R11, no entanto, caracterizou-se por sua alta suscetibilidade a todos os antibióticos, com exceção ao ácido nalidíxico. Observou-se, assim, relação direta entre resistência a antibióticos e produção de muco, como relatado por Sinclair & Eaglesham (1984). Xavier et al (1998) observaram que estirpes de rizóbios com resistência a antibióticos têm sido mais freqüentemente isoladas em solo com Al, o que pode indicar a existência de uma relação entre estas duas características em rizóbios.…”

Section: Resultsunclassified

Seleção inicial e caracterização parcial de rizóbios de tabuleiros costeiros quando associados ao guandu

Fernandes

2000

Rev. Bras. Ciênc. Solo

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“…Differences in growth rate were paralleled by differences in colony type. Slow-and fast-growers conformed, respectively, to the "dry" and "wet" colony types described for cowpea rhizobia (Sinclair & Eaglesham 1984).…”

Section: Resultsmentioning

confidence: 95%

Denitrifying and symbiotic characteristics of lotus rhizobia from two New Zealand soils

Steele

Neville

1991

New Zealand Journal of Agricultural Research

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The ability of lotus rhizobia isolated from two New Zealand soils to denitrify was tested in vitro, along with their symbiotic characteristics on the two host species (Lotus pedunculatus cv. Maku and L. corniculatus cv. Tana) used for their isolation. Based on colony type and growth rate, isolates from each soil were separated into two groups corresponding to Bradyrhizobium sp. (Lotus) and to Rhizobium loti. R. loti formed a significant proportion of nodules only on L. corniculatus. The bradyrhizobia were predominantly active denitrifiers. The proportion of non-denitrifying isolates found in this group differed between the two soils (12 versus 4%), but there was no effect of host plant (Maku, Tana) on their selection. No active denitrifiers were found among the R. loti isolates. Bradyrhizobium sp. were generally ineffective on L. corniculatus, but effective on L. pedunculatus. R. loti isolates were more effective on L. corniculatus than on L. pedunculatus, but the difference was not as great as with the bradyrhizobia. The implications of these findings are discussed in relation to possible nitrogen losses from pasture soils. A90082

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Intrinsic antibiotic resistance in relation to colony morphology in three populations of West African cowpea rhizobia

Cited by 32 publications

References 10 publications

Physiological behavior and antibiotic response of soybean (Glycine max L.) nodulating rhizobia isolated from Indian soils

Physiological behavior and antibiotic response of soybean (Glycine max L.) nodulating rhizobia isolated from Indian soils

Seleção inicial e caracterização parcial de rizóbios de tabuleiros costeiros quando associados ao guandu

Denitrifying and symbiotic characteristics of lotus rhizobia from two New Zealand soils

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