Indole acetic acid production by a Rhizobium species from root nodules of a leguminous shrub, Cajanus cajan |
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Authors: | Datta C Basu P S |
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Affiliation: | Department of Botany, Burdwan University, West Bengal, India. |
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Abstract: | A Rhizobium sp. isolated from the root nodules of a leguminous pulse-yielding shrub, Cajanus cajan, was found to produce high amounts (99.7 microg/ml) of indole acetic acid (IAA) during growth in basal medium supplemented with L-tryptophan. The Rhizobium sp. was a fast growing species which reached its stationary phase at 28 h. The IAA production could be increased upto 653.3% over control by supplementing the carbon-free incubation medium with glucose (5 g/l), NiCl2 (10 microg/ml) and glutamic acid (0.5 g/l). The possible role of rhizobial IAA on the rhizobia-legume symbiosis is discussed. |
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