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PMID: 1768137 Published · ppublish English Journal Article Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S.

Chemotaxis of Bradyrhizobium japonicum to soybean exudates.

Applied and environmental microbiology ·Vol. 57 ·No. 9 ·1991-09-00 ·Pages 2635-9

Barbour WM, Hattermann DR, Stacey G

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.

Related Genes
nod
MeSH Terms
Amino Acids/pharmacology Chemotaxis/drug effects Genes, Bacterial Hydroxy Acids/pharmacology Isoflavones/pharmacology Mutation Rhizobiaceae/drug effects,genetics,physiology Seeds/chemistry,microbiology Soybeans/chemistry,microbiology
Chemicals
Amino Acids Hydroxy Acids Isoflavones
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Barbour W M
Department of Microbiology, University of Tennessee, Knoxville 37996-0845.
Hattermann D R
Stacey G
References (16)
16 references, click to expand
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Article Info
Journal
Applied and environmental microbiology
Abbr.
Appl Environ Microbiol
ISSN
0099-2240
DOI
10.1128/aem.57.9.2635-2639.1991
Published
1991-09-00
Pages
2635-9
Language
English
Region
United States
NLM ID
7605801
PMCID
PMC183632
Subset
IM
Grants
NIGMS NIH HHS · GM 33494 · United States
NIGMS NIH HHS · GM 40183 · United States
External Links
PubMed source DOI: 10.1128/aem.57.9.2635-2639.1991 PMC Full Text View journal details
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