Potential Bioinoculants for Sustainable Agriculture Prospected from Ferruginous Caves of the Iron Quadrangle/Brazil

Biocontrol and plant growth-promoting bacteria (PGPB) are important agricultural bioinoculants. This study aimed to prospect new potential bioinoculants for a more sustainable agriculture from ferruginous caves of the Brazilian Iron Quadrangle. Culturable bacteria, seven one canga soil sample, were evaluated biocontroller activity phytopathogens Xanthomonas citri subsp. Citri—Xcc306 (citrus canker), Fusarium oxysporum—Fo (fusariosis), Colletotrichum lindemuthianum—Cl89 (bean anthracnose). The ability superior candidates solubilize inorganic phosphate, fix nitrogen, produce hydrolytic enzymes siderophores was then analyzed. Out 563 isolates, 47 inhibited growth Xcc306 in vitro, which 9 reduced citrus canker up 68% when co-inoculated with pathogen on host plants. Twenty Fo directly by 51–73%, 15 indirectly 75–81%. These Cl89 vitro (up 93% 100% indirectly), fixed produced proteases siderophores, showed motility ability, biofilm, all but solubilized phosphate. Therefore, (2.66%) bacterial genera Serratia, Nissabacter, Dickeya, act simultaneously as biocontrollers PGPBs, could be future investigations planta an alternative minimize use pesticides chemical fertilizers through management practices.