Trichoderma are ubiquitous soil fungi that include species widely used as
biocontrol agents in agriculture. Many isolates are known to secrete several secondary
metabolites with different biological activities towards plants and other microbes. Harzianic
acid (HA) is a T. harzianum metabolite able to promote plant growth and strongly bind
iron. In this work, we isolated from the culture filtrate of a T. harzianum strain a new
metabolite, named isoharzianic acid (iso-HA), a stereoisomer of HA. The structure and
absolute configuration of this compound has been determined by spectroscopic methods,
including UV-Vis, MS, 1D and 2D NMR analyses. In vitro applications of iso-HA
inhibited the mycelium radial growth of Sclerotinia sclerotiorum and Rhizoctonia solani.
Moreover, iso HA improved the germination of tomato seeds and induced disease
resistance.
Trichoderma are ubiquitous soil fungi that include species widely used asbiocontrol agents in agriculture. Many isolates are known to secrete several secondarymetabolites with different biological activities towards plants and other microbes. Harzianicacid (HA) is a T. harzianum metabolite able to promote plant growth and strongly bindiron. In this work, we isolated from the culture filtrate of a T. harzianum strain a newmetabolite, named isoharzianic acid (iso-HA), a stereoisomer of HA. The structure andabsolute configuration of this compound has been determined by spectroscopic methods,including UV-Vis, MS, 1D and 2D NMR analyses. In vitro applications of iso-HAinhibited the mycelium radial growth of Sclerotinia sclerotiorum and Rhizoctonia solani.Moreover, iso HA improved the germination of tomato seeds and induced diseaseresistance.
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