Stimulation of indoleacetic acid production in a <Emphasis Type="Italic">Rhizobium</Emphasis> isolate of <Emphasis Type="Italic">Vigna mungo</Emphasis> by root nodule phenolic acids |
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| Authors: | Santi M Mandal Mahitosh Mandal Amit K Das Bikas R Pati Ananta K Ghosh |
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| Institution: | (1) Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, India;(2) Department of Microbiology, Vidyasagar University, Midnapur, India;(3) School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, India |
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| Abstract: | The influence of endogenous root nodules phenolic acids on indoleacetic acid (IAA) production by its symbiont (Rhizobium) was examined. The root nodules contain higher amount of IAA and phenolic acids than non-nodulated roots. Presence of IAA
metabolizing enzymes, IAA oxidase, peroxidase, and polyphenol oxidase indicate the metabolism of IAA in the nodules and roots.
Three most abundant endogenous root nodule phenolic acids (protocatechuic acid, 4-hydroxybenzaldehyde and p-coumaric acid) have been identified and their effects on IAA production by the symbiont have been studied in l-tryptophan supplemented yeast extract basal medium. Protocatechuic acid (1.5 μg ml−1) showed maximum stimulation (2.15-fold over control) of IAA production in rhizobial culture. These results indicate that
the phenolic acids present in the nodule might serve as a stimulator for IAA production by the symbiont (Rhizobium).
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
An erratum to this article can be found at |
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| Keywords: | IAA Phenolic acids Rhizobium sp Root nodule Vigna mungo |
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