Production of 3-indolylacetic acid in root nodules and culture by a Rhizobium species isolated from root nodules of the leguminous pulse Phaseolus mungo
2008
Ghosh, S.,Burdwan Univ. (India). Dept. of Botany | Sengupta, C.,Kalyani Univ. (India). Dept. of Botany | Maiti, T.K.,Burdwan Univ. (India). Dept. of Botany | Basu, P.S.,Burdwan Univ. (India). Dept. of Botany
The root nodules of Phaseolus mungo (Vigna mungo) 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 microg/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 microg/mL). The possible role of the rhizobial production of IAA on the rhizobia-legume symbiosis is discussed.
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