Eco-friendly Management of Plant Pathogens through Secondary Metabolites Released by Fluorescent Pseudomonads

Concerning sustainable agriculture, plant growth promoting rhizobacteria (PGPR), which are a subgroup of “fluorescent pseudomonads,” are crucial. They are widely known for supporting plant health through a variety of methods. The use of fluorescent pseudomonads in agri-biotechnology has gained traction due to their potential for safeguarding plants from a variety of phytopathogens. Fluorescent pseudomonads being commercialized as bioinoculants for the treatment of various plant diseases is currently regarded as highly successful on a global scale. Fluorescent pseudomonads are being employed as efficient bio-control agents (BCAs) against an array of phytopathogens. Due to their capacity to generate a wide range of secondary metabolites, they offer enormous promise as BCA. Thus, this review’s goal is to outline and evaluate the functions of fluorescent pseudomonads’ secondary metabolites in reducing phytopathogens and improving plant health. Prominent secondary metabolites linked to biocontrol through fluorescent pseudomonads include phenazines (PHZ), 2, 4-diacetylphloroglucinol (DAPG), pyoluteorin (PLT), pyrrolnitrin (PRN), cyclic lipopeptides (CLPs), and volatile organic compounds (VOCs), including hydrogen cyanide (HCN). The antifungal, antibacterial, antiviral, antitumor, and antinematicidal effects of these metabolites are well-established.