A phytotoxic compound, identified as 2-(2-acetyl-3,5-dihydroxyphenyl) acetic acid (curvulinic acid), was isolated from liquid cultures of the phytopathogenic fungus Nimbya alternantherae. The activity of curvulinic acid on seed germination and seedling growth of Capsella bursa-pastoris was evaluated. Percentage seed germination of C. bursa-pastoris was decreased with increasing concentrations of curvulinic acid. The compound had stronger inhibitory effects on root length than shoot length. At a concentration of 600 microg x mL(-1), curvulinic acid caused 73.5% and 66.7% growth inhibition on roots and shoots with IC50 values of 204.7 and 281.1 microg x mL(-1), respectively. The finding of curvulinic acid in N. alternantherae and its herbicidal activity are reported here for the first time.

中文翻译：

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从花生互生菌中分离出来的曲维酸的除草活性。

从植物病原性真菌Nimbya alternantherae的液体培养物中分离出一种鉴定为2-（2-乙酰基-3,5-二羟基苯基）乙酸（曲霉素）的植物毒性化合物。评估了curvulinic acid对of菜的种子萌发和幼苗生长的活性。弯孢梭菌种子的发芽百分数随弯曲蛋白酸浓度的增加而降低。该化合物对根长的抑制作用比对茎长的抑制作用强。浓度为600微克x mL（-1）时，曲霉素对根和芽的生长抑制分别为73.5％和66.7％，IC50值分别为204.7和281.1微克x mL（-1）。在这里，首次报道了在交替猪笼草中发现曲霉酸及其除草活性。