Claim · model-written summary
Indole acetic acid production by A. brasilense increased with increasing tryptophan concentration from 1 to 100 mug/ml.
Azospirillum brasilenseVerbatim
e0“Azospirillum brasilense, a nitrogen-fixing bacterium”
e1“Indole acetic acid production increased with increasing tryptophan concentration from 1 to 100 mug/ml”
Title
T. M. Tien; M. H. Gaskins; D. H. Hubbell Applied and Environmental Microbiology 1979. doi:10.1128/aem.37.5.1016-1024.1979
Other claims from this paper (11)
- Observation Azospirillum brasilense produced indole acetic acid and indole lactic acid from tryptophan in liquid culture.
- Association Indole acetic acid concentration in A. brasilense cultures increased with culture age until the bacteria reached the stationary phase.
- Intervention effect Shaking favored indole acetic acid production by A. brasilense, especially in a nitrogen-containing medium.
- Observation A small but biologically significant amount of gibberellin was detected in the A. brasilense culture medium.
- Observation At least three cytokinin-like substances, equivalent to about 0.001 mug of kinetin per ml, were present in the A. brasilense culture.
- Intervention effect Inoculation with A. brasilense increased the number of lateral roots of pearl millet plants in solution culture.
- Intervention effect In pearl millet inoculated with A. brasilense, all lateral roots were densely covered with root hairs.
- Intervention effect Gibberellin increased lateral root production in pearl millet in experiments with pure plant hormones.
- Intervention effect Cytokinin stimulated root hair formation in pearl millet.
- Intervention effect Cytokinin reduced lateral root production and elongation of the main root in pearl millet.
- Intervention effect Combinations of indole acetic acid, gibberellin and kinetin produced changes in pearl millet root morphology similar to those produced by inoculation with A. brasilense.