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New Antimicrobial Cyclopentenones from Nigrospora sphaerica ZMT05, a Fungus Derived from Oxya chinensis Thunber.
Journal of Agricultural and Food Chemistry 2018 May 31
Six new cyclopentenone derivatives (+)-nigrosporione A (+)-1, (-)-nigrosporione A (-)-1, nigrosporione B (2), nigrosporione C (3), (+)-nigrosporione D (+)-4, and (-)-nigrosporione D (-)-4 were isolated from an endophytic fungus Nigrospora sphaerica ZMT05, collected from the rice grasshopper ( Oxya chinensis Thunberg), which is an insect pest in rice and which is also used as a food for people in some countries. Their planar and spatial structures were determined by spectroscopic analyses and eletronic circular dichroism (ECD) calculations. Compounds (+)-1, (-)-1, and 2 inhibited the plant pathogens Fusarium oxysporum, Colletotrichum musae, Penicillium italicum, and Fusarium graminearum, compounds 3 and (-)-4 inhibited F. oxysporum, C. musae, and P. italicum, and compound (+)-4 inhibited F. oxysporum, C. musae, and F. graminearum, showing antifungal activities stronger than triadimefon. Additionally, compounds (+)-1, (-)-1, 2, and 3 displayed moderate antibacterial activities against Staphyloccocus aureus and Escherichia coli.
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