Application of <i>Aureobasidium pullulans</i> in iron?poor soil. Can the production of siderophores improve iron bioavailability and yeast antagonistic activity?

Iron is a fundamental element for plants as well microorganisms and several pathogens, including Rhizoctonia solani, one of the main soil-borne pathogens tomato. This study demonstrated ability Aureobasidium pullulans strain L1 to produce siderophores how these molecules were, directly indirectly, connected its antagonistic activity iron bioavailability. By ICP-OES (Inductively Coupled Plasma—Optical Emission Spectroscopy) trace analysis, displayed increase bioavailability Fe (II) in soil by almost 50% 30 days after inoculation. Also, Mn, Cu Zn was increased incubation 31.8, 38.4 27.1%, respectively. In vivo assays, A. showed growth promotion tomato roots length stem diameter, respectively, 19.1 27.3%, acted biocontrol agent (BCA) against R. solani (80% inhibition). The results demonstrate new aspect this microorganism, usually applied an antagonist postharvest fruit diseases, explore different environments such pathogens.