Biomaterial Database

Chemotaxis of Bradyrhizobium japonicum to soybean exudates. 1991

W M Barbour, and D R Hattermann, and G Stacey

Department of Microbiology, University of Tennessee, Knoxville 37996-0845.

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.

UI	MeSH Term	Description	Entries
D007529	Isoflavones	3-Phenylchromones. Isomeric form of FLAVONOIDS in which the benzene group is attached to the 3 position of the benzopyran ring instead of the 2 position.	3-Benzylchroman-4-One,3-Benzylidene-4-Chromanone,Homoisoflavone,Homoisoflavones,Isoflavone,Isoflavone Derivative,3-Benzylchroman-4-Ones,3-Benzylidene-4-Chromanones,Isoflavone Derivatives,3 Benzylchroman 4 One,3 Benzylchroman 4 Ones,3 Benzylidene 4 Chromanone,3 Benzylidene 4 Chromanones,Derivative, Isoflavone,Derivatives, Isoflavone
D009154	Mutation	Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations.	Mutations
D002633	Chemotaxis	The movement of cells or organisms toward or away from a substance in response to its concentration gradient.	Haptotaxis
D005798	Genes, Bacterial	The functional hereditary units of BACTERIA.	Bacterial Gene,Bacterial Genes,Gene, Bacterial
D006880	Hydroxy Acids	Organic compounds containing both the hydroxyl and carboxyl radicals.	Hydroxy Acid,Acid, Hydroxy,Acids, Hydroxy
D000596	Amino Acids	Organic compounds that generally contain an amino (-NH2) and a carboxyl (-COOH) group. Twenty alpha-amino acids are the subunits which are polymerized to form proteins.	Amino Acid,Acid, Amino,Acids, Amino
D012230	Rhizobiaceae	A family of gram-negative bacteria which are saprophytes, symbionts, or plant pathogens.	Bradyrhizobium lupini,Neorhizobium galegae,Rhizobium galegae,Rhizobium lupini
D012639	Seeds	The encapsulated embryos of flowering plants. They are used as is or for animal feed because of the high content of concentrated nutrients like starches, proteins, and fats. Rapeseed, cottonseed, and sunflower seed are also produced for the oils (fats) they yield.	Diaspores,Elaiosomes,Embryos, Plant,Plant Embryos,Plant Zygotes,Zygotes, Plant,Diaspore,Elaiosome,Embryo, Plant,Plant Embryo,Plant Zygote,Seed,Zygote, Plant
D013025	Glycine max	An annual legume. The SEEDS of this plant are edible and used to produce a variety of SOY FOODS.	Soy Beans,Soybeans,Bean, Soy,Beans, Soy,Soy Bean,Soybean