Published in Scientific Papers. Series B, Horticulture, Vol. LXVII, Issue 1
Written by Sorin MATEI, Gabi-Mirela MATEI
The paper aims to select probiotic microorganisms capable of producing siderophores for iron chelation and to make conjugates with the water-soluble fulvic fraction of Mollic Gleysol (WRB), (0–20 cm). The biosynthetic performances of 5 strains of probiotic bacteria from the collection, belonging to genera Lactobacillus (LAB 41, LAB 62, LAB 57, LAB 83, LAB 69), isolated from different soil types, were evaluated in terms of siderophores production (CAS method), type (Arnow and Csaky tests) and complexation capacity. The probiotic strains produced amounts of siderophores between 97–158 µmol L-1 in 48–96 hours, of catecholate and hydroxymate type and of both types in the case of LAB 62, LAB 69 and LAB 83 strains. LAB 83 strain had the highest iron chelating capacity. The inhibition capacity of the conjugates was tested and evaluated on 3 phytopathogenic fungal isolates (P. expansum, A. flavus and A. ochraceus). Probiotic strains are promising for the purpose of producing siderophores but also for antifungal effect when these act as conjugants with a fulvic acid subfraction.
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