Soybean-mediated suppression of BjaI/BjaR₁ quorum sensing in Bradyrhizobium diazoefficiens impacts symbiotic nitrogen fixation.

ABSTRACT: The acyl-homoserine lactones (AHLs)-mediated LuxI/LuxR quorum sensing (QS) system orchestrates diverse bacterial behaviors in response to changes in population density. The role of the BjaI/BjaR₁ QS system in Bradyrhizobium diazoefficiens USDA 110, which shares homology with LuxI/LuxR, remains elusive during symbiotic interaction with soybean. Here this genetic system in wild-type (WT) bacteria residing inside nodules exhibited significantly reduced activity compared to free-living cells, potentially attributed to soybean-mediated suppression. The deletion mutant strain ΔbjaR₁ showed significantly enhanced nodulation induction and nitrogen fixation ability. Nevertheless, its ultimate symbiotic outcome (plant dry weight) in soybeans was compromised. Furthermore,

SUBMITTER: Han F 

PROVIDER: S-EPMC10880635 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature