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Harzianic acid is a Trichoderma secondary metabolite. Harzianic acid shows plant growth promotion activity. 3. Harzianic acid has antifungal activity and antibiotic activity against Pythium irregulare, Sclerotinia sclerotiorum, and Rhizoctonia solani.

Harzianic acid, a tetramic acid derivative, with activity of antimicrobial, antibiofilm formation and biofilm disaggregation. Harzianic acid interferes with biofilm formation by limiting bacterial iron availability. Harzianic acid is also a selective inhibitor of Acetohydroxyacid synthase (AHAS), the first enzyme in the branched-chain amino acid biosynthetic pathway. Harzianic acid can used for herbicide and fungicide[1][2].

Antifection

[1] De Filippis A, et al. Antimicrobial activity of harzianic acid against Staphylococcus pseudintermedius. Nat Prod Res. 2021 Dec;35(23):5440-5445. DOI:10.1080/14786419.2020.1779714
[2] Xie L, et al. Harzianic Acid from Trichoderma afroharzianum Is a Natural Product Inhibitor of Acetohydroxyacid Synthase. J Am Chem Soc. 2021 Jun 16:10.1021/jacs.1c03988. DOI:10.1021/jacs.1c03988. doi: 10.1021/jacs.1c03988