Siderophores: Enhancing crop nutrition and improving stress tolerance through microbial iron scavenging

Soil stress conditions, such as nutrient deficiencies, drought, salinity, and heavy metal contamination, significantly hinder plant growth and agricultural productivity. This review explores the use of microbial consortia, particularly siderophore-producing bacteria, as biocontrol agents and biofertilizers to mitigate these stresses. Siderophores, molecules that sequester iron, enhance plant access to nutrients while limiting pathogen growth. The microbial consortia improve nutrient availability, combat pathogens, and stimulate plant growth. These microorganisms also enhance soil fertility, resistance to abiotic stress, and overall soil health. The review examines the molecular mechanisms behind siderophore production, their chemical structures, and the interaction between plant roots and microbes. It also highlights the potential of siderophores to promote plant growth on degraded lands, offering an alternative to chemical fertilizers. This approach represents a shift towards sustainable, biologically-driven agricultural practices, reducing reliance on synthetic inputs. However, the exact mechanisms of siderophore action remain unclear. The review identifies research gaps in understanding their production, modes of action, and roles in soil-plant-microbe interactions. Addressing these gaps could lead to optimized siderophore-based consortia, providing sustainable solutions for mitigating soil stress, improving soil health, and boosting agricultural productivity.