Abstract
Rice (Oryza sativa L.) seedlings of eight cultivars inhibited the growth of lettuce, cress and alfalfa seedlings when grown together. Growth inhibiting activities of these rice seedlings differed with the cultivars. All rice cultivars released momilactone B into culture solution, and their release levels differed among rice cultivars. There was a good correlation between the release levels of momilactone B from rice cultivars and the allelopathic activities of these rice cultivars. Thus, momilactone B may be important for the allelopathic activity of these rice cultivars.
