title: Preincubation of Mesorhizobium ciceri with flavonoids improves its nodule occupancy.
abstract: Strains of M. ciceri, symbionts of chickpea (Cicer arietinum) were incubated with the flavonoids naringenin, daidzein and quercetin which have earlier been reported as inducers and inhibitors of nodABC-lacZ fusion of M. ciceri. Preincubation of M. ciceri with naringenin and daidzein (100 nmol/L) for 1 d improved the competitive ability of the inoculated strain while preincubation with quercetin decreased the nodule occupancy of inoculated strain under sterile conditions. Under non-sterile conditions induced strains of Rcd 301 and HT-6 formed by 23 and 18% more nodules, respectively, than untreated control. Quercetin-treated strains showed by 13-20% fewer nodules than untreated controls. Therefore, it is possible to regulate the competitive ability of inoculated strains by flavonoid treatment.
authors.affiliation: Department of Microbiology, Chaudhary Charan Singh Haryana Agricultural University, Hisar 125 004, India.
authors.forename: P K
authors.initials: PK
authors.lastname: Sharma
authors.forename: K K
authors.initials: KK
authors.lastname: Upadhyay
authors.forename: D V
authors.initials: DV
authors.lastname: Kamboj
authors.forename: K
authors.initials: K
authors.lastname: Kukreja
mesh_terms: D020561:Alphaproteobacteria / Q000187:drug effects* / Q000254:growth & development; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D029863:Cicer / Q000382:microbiology*; D044950:Flavanones; D005419:Flavonoids / Q000494:pharmacology*; D015964:Gene Expression Regulation, Bacterial; D007529:Isoflavones / Q000494:pharmacology; D018517:Plant Roots / Q000382:microbiology; D011794:Quercetin / Q000494:pharmacology; D013559:Symbiosis / Q000187:drug effects*
chemical_list: D001426:Bacterial Proteins; D044950:Flavanones; D005419:Flavonoids; D007529:Isoflavones; C004742:daidzein; D011794:Quercetin; C005273:naringenin