Chemotaxis of Bradyrhizobium japonicum to soybean exudates

Barbour, W.M. and Hattermann, D.R. and Stacey, G. (1991) Chemotaxis of Bradyrhizobium japonicum to soybean exudates. Applied and Environmental Microbiology, 57 (9). pp. 2635-2639.

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Abstract

The chemotactic response of Bradyrhizobium japonicum toward soybean seed and root exudates was examined. Assays using various isoflavones and fractionated exudate indicated that isoflavones are not the principal attractants in exudates. Likewise, induction of nod genes with isoflavones or seed exudate before assay did not enhance chemotaxis. Screening of numerous compounds revealed that only dicarboxylic acids and the amino acids glutamate and aspartate were strong attractants. The presence of glutamate, aspartate, and dicarboxylic acids in appreciable concentrations in soybean seed and root exudates indicates that these compounds likely represent natural chemoattractants for B. japonicum

Item Type: Article
Author Affiliation: Department of Microbiology, University of Tennessee, Knoxville 37996-0845
Subjects: Crop Improvement
Divisions: Soyabean
Depositing User: Mr B Krishnamurthy
Date Deposited: 14 May 2013 11:18
Last Modified: 14 May 2013 11:18
URI: http://eprints.icrisat.ac.in/id/eprint/10533

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