Journal
FEMS MICROBIOLOGY LETTERS
Volume 347, Issue 2, Pages 123-129Publisher
WILEY-BLACKWELL
DOI: 10.1111/1574-6968.12231
Keywords
secondary metabolites; harzianic acid; iron(III); Trichoderma; siderophores
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Agriculture-relevant microorganisms are considered to produce secondary metabolites during processes of competition with other micro- and macro-organisms, symbiosis, parasitism or pathogenesis. Many different strains of the genus Trichoderma, in addition to a direct activity against phytopathogens, are well-known producers of secondary metabolites and compounds that substantially affect the metabolism of the host plant. Harzianic acid is a Trichoderma secondary metabolite, showing antifungal and plant growth promotion activities. This report demonstrates the ability of this tetramic acid to bind with a good affinity essential metals such as Fe3+, which may represent a mechanism of iron solubilisation that significantly alters nutrient availability in the soil environment for other microorganisms and the host plant.
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