Isoliquiritigenin, a strong nod gene- and glyceollin resistance-inducing flavonoid from soybean root exudate

Isoflavonoid signal molecules from soybean (Glycine max (L.) Merr.) seed and root exudate induce the transcription of nodulation (nod) genes in Bradyrhizobium japonicum. In this study, a new compound with symbiotic activity was isolated from soybean root exudate. The isolated 2',4',4-trihy...

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Bibliographic Details
Published in:Applied and Environmental Microbiology 1992-05, Vol.58 (5), p.1705-1710
Main Authors: Kape, R. (Philipps-Universitat Marburg, Marburg, Germany), Parniske, M, Brandt, S, Werner, D
Format: Article
Language:English
Subjects:
Bacteria
Benzopyrans - pharmacology
Biological and medical sciences
BRADYRHIZOBIUM
Bradyrhizobium japonicum
CALCONA
CHALCONE
Chalcone - analogs & derivatives
Chalcone - pharmacology
Chalcones
Chemotaxis - drug effects
Drug Resistance, Microbial
EXSUDAT
EXUDADOS
FITOALEXINA
Fundamental and applied biological sciences. Psychology
GENE
Gene Expression Regulation, Bacterial - drug effects
GENES
Genes, Bacterial
Genetics
GLYCINE MAX
Glycine max - chemistry
Glycine max - metabolism
Glycine max - microbiology
GRAINE
MECANISME CHIMIOTACTIQUE
Parasitism and symbiosis
PHYTOALEXINE
Phytoalexins
Plant Extracts - biosynthesis
Plant Extracts - pharmacology
Plant physiology and development
Pterocarpans
QUIMIOTACTISMO
RACINE
RAICES
SEMILLA
Sesquiterpenes
Soybeans
Symbiosis
Terpenes
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Summary:Isoflavonoid signal molecules from soybean (Glycine max (L.) Merr.) seed and root exudate induce the transcription of nodulation (nod) genes in Bradyrhizobium japonicum. In this study, a new compound with symbiotic activity was isolated from soybean root exudate. The isolated 2',4',4-trihydroxychalcone (isoliquiritigenin) is characterized by its strong inducing activity for the nod genes of B. japonicum. These genes are already induced at concentrations 1 order of magnitude below those required of the previously described isoflavonoid inducers genistein and daidzein. Isoliquiritigenin is also a potent inducer of glyceollin resistance in B. japonicum, which renders this bacterium insensitive to potentially bactericidal concentrations of glyceollin, the phytoalexin of G. max. No chemotactic effect of isoliquiritigenin was observed. The highly efficient induction of nod genes and glyceollin resistance by isoliquiritigenin suggests the ecological significance of this compound, although it is not a major flavonoid constituent of the soybean root exudate in quantitative terms
ISSN:0099-2240
1098-5336
DOI:10.1128/aem.58.5.1705-1710.1992