SYNTHETIC BIOLOGY PLATFORMS FOR ENGINEERING DROUGHT-TOLERANT AGRICULTURAL MICROBIOMES

Abstract

Background: Drought stress is one of the most important environmental constraints that limit agricultural productivity and global food security. Traditional crop improvement techniques are not well suited to the rapidly changing climatic conditions and typically take a long time for breeding. Agricultural microbiomes have recently been emphasized for their potential to improve plant resilience through beneficial plant–microbe interactions. Synthetic biology provides sophisticated tools to design microbial communities with enhanced drought-responsive traits for sustainable agriculture.

Objective: The goal of this study is to design drought-resistant agricultural microbiomes using synthetic biology platforms to enhance plant growth and stress tolerance under water-deficit conditions.

Methodology:  Beneficial rhizosphere microbes including Bacillus subtilis, Pseudomonas fluorescens, and Azospirillum brasilense were genetically engineered using CRISPR-Cas9 mediated pathway optimization. Engineered microbial consortia were tested in greenhouse drought conditions with maize and wheat crops. The drought tolerance was evaluated by measuring physiological and biochemical parameters.

Findings: Engineered microbiomes enhanced biomass accumulation by 42%, chlorophyll retention by 36%, root development by 48% and relative water content by 81% compared to untreated controls. Enhanced drought resistance was due to better microbial colonization and activation of stress-responsive genes.

Conclusion: This study shows that synthetic biology assisted microbiome engineering is an effective and sustainable strategy to develop climate-resilient agricultural systems under drought-prone conditions.