Biochemical and multi-omics analyses of response mechanisms of rhizobacteria to long-term copper and salt stress: Effect on soil physicochemical properties and growth of Avicennia marina
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View abstract on PubMed
Summary
This summary is machine-generated.Mangrove rhizobacteria exhibit distinct metabolic adaptations to salinity and copper stress, enhancing plant resilience. These findings offer insights into managing mangrove ecosystems under environmental pressures.
Area Of Science
- Environmental microbiology
- Plant-bacteria interactions
- Biogeochemistry
Background
- Mangroves are vital ecosystems with significant carbon sequestration potential.
- Increasing salinity and heavy metal pollution threaten mangrove health and productivity.
- Rhizobacteria play a crucial role in plant stress tolerance and nutrient cycling.
Purpose Of The Study
- To investigate the tolerance mechanisms of rhizobacteria in Avicennia marina under long-term salinity and copper (Cu) stress.
- To identify differential metabolic pathways and community structure changes in response to these stresses.
- To understand the role of rhizobacteria in mitigating abiotic stress and promoting mangrove growth.
Main Methods
- Long-term (4-year) controlled stress experiments with Avicennia marina and its associated rhizobacteria.
- Analysis of antioxidant levels, gene transcripts, and secondary metabolites.
- Metabolomic profiling to identify differentially expressed metabolites and regulated pathways.
- Bacterial community structure analysis using 16S rRNA sequencing.
Main Results
- Significant differences in metabolite profiles and pathway regulation were observed between salt and Cu stress treatments.
- Phenylpropanoid biosynthesis was uniquely regulated under Cu stress, while alanine/aspartate/glutamate and α-linolenic acid metabolism were unique to salt stress.
- Rhizobacterial adaptations enhanced antioxidant defenses, nutrient recycling, osmoprotectant accumulation, membrane stability, and Cu chelation, benefiting A. marina growth.
- Despite community structure shifts dominated by Proteobacteria, Chloroflexi, Actinobacteriota, and Firmicutes, unbalanced responses led to differential plant growth.
Conclusions
- Rhizobacteria possess distinct adaptive mechanisms to salinity and copper stress, crucial for mangrove resilience.
- Understanding these mechanisms is key to developing strategies for managing and restoring mangrove ecosystems under environmental stress.
- This study provides a foundation for future research on long-term mangrove management practices.
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