The fungus Paecilomyces variotii Bainier, isolated from larvae of Dendroctonus ponderosa Hopk. (mountain pine beetle), is antagonistic to Ophiostoma clavigerum, the fungus believed responsible for tree mortality caused by blue stain fungi. The metabolites produced by P. variotii when grown in liquid culture have been studied and two new 1H-naphtho[2,3-c]pyran-1-ones related to semi-vioxanthin (4) have been isolated. The structures of these two metabolites, semi-viriditoxin (1) and semi-viriditoxic acid (2), have been determined by chemical and spectroscopic methods. Key words: fungal metabolites, blue stain disease, Paecilomyces variotii, semi-viridotoxin, semi-viridotoxic acid.
从白松毛虫幼虫中分离出的Paecilomyces variotii Bainier真菌对蓝色霉菌引起的树木死亡负责的真菌Ophiostoma clavigerum具有拮抗作用。当P. variotii在液体培养条件下生长时,所产生的代谢产物已被研究,并分离出两种新的1H-
萘[2,3-c]
吡喃-1-酮,与半-
黄酮(4)有关。通过
化学和光谱方法确定了这两种代谢产物,半-绿毒素(1)和半-绿毒酸(2)的结构。关键词:真菌代谢产物、蓝色污斑病、Paecilomyces variotii、半-绿毒素、半-绿毒酸。