COCHLIOQUINOL - A NEW COCHLIOQUINONE DERIVATIVE PRODUCED BY THE PLANT-PATHOGENIC FUNGUS BIPOLARIS-CYNODONTIS

The structure of cochlioquinol (1), a new compound isolated from a cul ture of the plant pathogenic fungus. Bipolaris cynodontis, was determi ned, based on single-crystal X-ray diffraction studies. Compound 1 was found to be related to cochlioquinone derivatives that had previously been isolated as phytotoxins from a culture of B. bicolor, in which t he addition of acetone occurred at one of the quinone carbonyl groups of cochlioquinone. Compound 1 inhibited the root growth of Italian rye grass, one of the host plants of B. cynodontis, by 50% at a concentrat ion of 100 ppm.