Abstract
The root nodules of Phaseolus mungo (a herbaceous leguminous pulse) contained a high amount of 3-indolylacetic acid (IAA). A tryptophan pool present in the nodule might play the role of precursor for IAA production. From the root nodule a Rhizobium sp. was isolated. The symbiont produced a large amount of IAA (142 μg/mL) from L-tryptophan-supplemented basal medium. The production of IAA by the symbiont was much increased over the control when a l-tryptophan (2 mg/mL) supplemented C-free mineral medium was enriched with mannitol (1 %), l-asparagine (0.3 %) and thiamine hydrochloride (1 μg/mL). The possible role of the rhizobial production of IAA on the rhizobia-legume symbiosis is discussed.
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Abbreviations
- IAA:
-
3-indolylacetic acid
- YEM:
-
yeast extract mineral medium
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Ghosh, S., Sengupta, C., Maiti, T.K. et al. Production of 3-indolylacetic acid in root nodules and culture by a Rhizobium species isolated from root nodules of the leguminous pulse Phaseolus mungo . Folia Microbiol 53, 351–355 (2008). https://doi.org/10.1007/s12223-008-0054-6
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DOI: https://doi.org/10.1007/s12223-008-0054-6