SYNTHETIC BIOLOGY STRATEGIES FOR ENGINEERING NITROGEN-EFFICIENT MICROBIAL COMMUNITIES IN AGRICULTURE

Abstract

Background: Nitrogen deficiency is a key factor limiting the global agricultural productivity, and excessive application of synthetic nitrogen fertilizers leads to soil degradation, greenhouse gas emissions and environmental pollution. Therefore, there is a need for sustainable alternatives to improve the nitrogen-use efficiency in agriculture.

Objective: The present study aimed to develop nitrogen-efficient microbial communities by synthetic biology approaches to improve biological nitrogen fixation, rhizosphere stability and sustainable crop productivity.

Methodology: We engineered beneficial microbial consortia with nitrogen-fixing and plant growth-promoting bacteria by using CRISPR-based genome editing, synthetic gene circuits and metabolic pathway optimization. We conducted soil microcosm experiments, metagenomic sequencing, transcriptomic analysis, and plant growth assessment to assess the efficiency of nitrogen fixation and interactions in microbial communities.

Findings: They found that engineered microbial communities significantly increased nitrogen fixation efficiency. Nitrogen fixation rates were 38% in the control group and 82% in engineered microbial treatments. The use of synthetic microbial consortium enhanced plant biomass by 48%. Transcriptomic analysis showed an up-regulation of nitrogen metabolism genes such as nifH (4.2-fold), amoA (3.1-fold), and glnA (2.8-fold). Synthetic regulatory circuits enhanced microbial cooperation, stress tolerance and nutrient assimilation in the rhizosphere ecosystem.

Conclusion: Our findings show that synthetic microbiome engineering can help achieve sustainable agriculture through improved nitrogen cycling efficiency, lower dependence on fertilizers, and climate-resilient crop production.