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Armaan Kaur Sandhu1, McKenzie Rae Brown1, Senthil Subramanian1,2
1Departments of Biology and Microbiology, South Dakota State University, Brookings, SD, United States.
Frontiers in Microbiology
|June 5, 2023
Summary
Soybean root exudates significantly alter Bradyrhizobium diazoefficiens surface properties and attachment. Cell surface hydrophobicity is key for root attachment, demonstrating bacteria
Area of Science:
- Microbiology
- Plant-Bacterial Interactions
- Biochemistry
Background:
- Bradyrhizobium diazoefficiens is crucial for soybean nitrogen fixation.
- Bacterial attachment to soybean roots is essential for symbiosis.
- Little is known about how root exudates affect bacterial phenotype and attachment.
Purpose of the Study:
- To investigate the impact of root exudate chemical compounds (RECCs) on B. diazoefficiens USDA110 phenotype.
- To determine how RECCs influence bacterial attachment to soybean roots.
- To identify key bacterial surface properties affecting root attachment.
Main Methods:
- Studied 12 RECCs, a carbon source, and SESOM effects on B. diazoefficiens USDA110.
- Assessed motility (swimming, swarming, chemotaxis, flagellar expression).
- Measured attachment properties (hydrophobicity, biofilm, cellulose/root attachment) and surface polysaccharides.
Main Results:
- B. diazoefficiens USDA110 exhibits high phenotypic plasticity in response to RECCs.
- Specific RECCs differentially modulated motility and attachment.
- Cell surface hydrophobicity significantly impacted root attachment; biofilm formation on polystyrene did not correlate with root attachment.
Conclusions:
- Soybean RECCs determine B. diazoefficiens attachment phenotype and surface plasticity.
- Observed bacterial behavior with standard carbon sources may not reflect soil conditions.
- Cell surface hydrophobicity is a critical factor for symbiotic association.