Role of Plant Growth - Promoting Rhizobacteria (PGPR) in Sustainable Agriculture

Abstract

The rapid escalation of global food demand combined with climate-induced environmental anomalies challenges the stability of contemporary agricultural systems. Plant Growth-Promoting Rhizobacteria (PGPR) represent a premier biological alternative to hazardous synthetic inputs, steering modern farming toward ecological sustainability. Operating within the immediate root zone, these specialized microbes enhance crop development via multi-pronged direct pathways, including biological nitrogen fixation, insoluble mineral solubilization, and the synthesis of foundational phytohormones that enhance root architecture. Beyond nutritional facilitation, PGPR function as effective biocontrol agents. They suppress severe soil-borne infestations by releasing lytic enzymes, producing iron-chelating siderophores, and awakening the host plant’s innate immunity via Induced Systemic Resistance (ISR). Furthermore, these beneficial microbes ease severe environmental conditions such as prolonged drought, heavy metal accumulation, and soil salinity through Induced Systemic Tolerance (IST). While translating lab-scale success to unpredictable field settings remains a primary operational hurdle, modern metagenomic insights and synthetic microbial consortia hold massive promise. Ultimately, embedding PGPR into mainstream agronomic management is imperative to secure global food networks while preserving edaphic and ecological integrity.

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