Legume microgreens are gaining popularity as a superfood due to their rich micronutrient content and easy cultivation methods. Indoor soilless cultivation of legume microgreens can be a futuristic agricultural solution to achieve efficient farming without causing environmental destruction. Soilless farming methods use only a fraction of the water required for outdoor traditional farming and almost none of the harmful pesticides. Plant growth-promoting rhizobium (PGPR) are beneficial bacteria that enhance plant growth and health through various mechanisms, offering a sustainable alternative to synthetic fertilizers and pesticides, especially relevant for the cultivation of leguminous microgreens. PGPR can help improve nutrition assimilation, modulate phytohormones, induce gene expression, and enhance stress tolerance, which can have a positive effect on plant growth. Therefore, the implementation of PGPR in soilless microgreen farming may reduce chemical nutrient requirements and improve yield, quality, and shelf life. PGPR also chelate iron with siderophores, regulate growth via phytohormone production, and produce ACC deaminase to alleviate stress by lowering ethylene levels. Additionally, PGPR produce antimicrobial compounds and trigger plant defense mechanisms, enhancing resistance to pathogens. In soilless farming systems like hydroponics and vertical farming, advances in high-throughput sequencing, functional genomics, and synthetic biology are expanding the understanding and application of PGPR, enabling manipulation of strains for enhanced beneficial traits. Here, we highlight the importance of PGPR in leguminous seed germination and seedling growth, emphasizing its possible use in soilless microgreen farming, contributing to resilient and productive agricultural systems.