Microbial consortium mediated growth promotion and Arsenic reduction in Rice: An integrated transcriptome and...

Area of Science:

• Environmental Science
• Plant Biology
• Microbiology

Background:

• Arsenic (As) contamination in rice poses a significant threat to global food security and safety.
• Understanding the mechanisms of arsenic (As) stress mitigation in rice is crucial for sustainable agriculture.

Purpose of the Study:

• To investigate the mechanisms by which a microbial consortium (P. putida + C. vulgaris) promotes rice growth and ameliorates arsenic (As) toxicity.
• To analyze the molecular-level changes in gene and protein expression in rice plants exposed to arsenic (As) and treated with the microbial consortium.

Main Methods:

• Hydroponic culture of rice seedlings exposed to 50 µM arsenic (As) alone and with a microbial consortium.
• Transcriptome analysis using Illumina sequencing to identify differentially expressed genes.
• Proteome profiling via 2D gel electrophoresis to analyze protein abundance changes.

Main Results:

• Microbial consortium inoculation significantly reduced arsenic (As) toxicity, improved root hair growth, and maintained cellular integrity.
• Down-regulation of arsenic (As) transporters and up-regulation of nutrient transporters were observed, suggesting reduced As uptake and improved nutrient status.
• Differential expression of regulatory genes (AUX/IAA, WRKY, MYB) and proteins involved in photosynthesis, energy metabolism, and defense mechanisms were identified.

Conclusions:

• The microbial consortium effectively ameliorates arsenic (As) stress and promotes rice growth through multifaceted molecular mechanisms.
• This study provides comprehensive insights into the genetic and proteomic responses of rice plants to arsenic (As) and microbial intervention.
• Findings support the potential of microbial consortia as a sustainable strategy for mitigating arsenic (As) contamination in rice.