Actinobacteria in Plant Health: A Sustainable Approach to Biocontrol and Disease Management

Abstract

Actinobacteria are a diverse group of Gram-positive bacteria found in various ecosystems, including soil, plant rhizospheres, and marine environments. Their presence contributes significantly to microbial diversity, influencing ecosystem stability and plant health. These bacteria play a crucial role in promoting plant growth under normal and stress conditions through multiple mechanisms, including enhanced nutrient uptake, production of phytohormones, and induction of pathogenesis-related (PR) proteins. Additionally, actinobacteria stimulate enzymatic activity, produce antibiotics, and synthesize secondary metabolites that aid in plant defense. One of the key attributes of actinobacteria is their ability to suppress plant pathogens through the production of bioactive compounds, including antimicrobial metabolites and lytic enzymes. These metabolites not only inhibit the growth of pathogens but also activate systemic resistance in plants, improving their ability to withstand infections. Furthermore, actinobacteria contribute to soil fertility by decomposing organic matter and facilitating nutrient cycling, thereby enhancing plant resilience. The biotechnological potential of actinobacteria is immense, as their use in agriculture can offer an eco-friendly alternative to chemical pesticides and fertilizers. By harnessing these beneficial microbes, sustainable plant protection strategies can be developed, reducing crop losses due to pathogenic stress while promoting healthier plant growth and productivity.