Figure 4.
Structures and in vitro activity of the purified anti-Fusarium compounds from fungal endophyte strains WF5, WF6 and WF7. (a) Structure of compound 1,5-hydroxy benzofuranone (from strain WF5); (b) Representative picture of the disc diffusion assay showing the anti-Fusarium activity of compound 1; (c) Structure of compound 2, dehydrocostus lactone (from strain WF6); (d) Representative picture of the disc diffusion assay showing the anti-Fusarium activity of compound 2; (e) Structure of compound 3, harpagoside (from strain WF7); (f) Representative picture of the disc diffusion assay showing the anti-Fusarium activity of compound 3. Numbers (1–9) denote a concentration gradient of 4000, 2000, 1000, 500, 250, 125, 62.5, 31.25, 15.62 and 7.8 μg/mL while C denotes the solvent control.