ALLELOPATHIC COMPOUNDS PRODUCED BY FOREST PLANTS .2. THE RELATIONSHIPS BETWEEN THE INHIBITION EFFECTS ON PLANT-GROWTH AND KILLING ACTIVITIES OF BRINE SHRIMP ON PHENOLIC-COMPOUNDS

The inhibition effects of the groups of benzoic acid, cinnamic acid, a nd coumarin on the growth of seedlings of radish (Raphanus Sativus L. var. radicula Pers.), lettuce (Latu. Sativa L.), alfalfa (Medicago Sat iva L.) and komatsuna (Brassica rapa L. var. perviridis Bail.) were in vestigated. The inhibition effects of the compounds were different amo ng tested plants. However, the tendencies of the inhibition effects we re similar. The results indicated that the inhibition effects of the c ompounds are as follows: the group of coumarin > the group of cinnamic acid > the group of benzoic acid. This order was similar to that of a ll plants tested. The bioassay system using the larvae of brine shrimp (Artemia salina Leach) against allelopathic compounds was studied. It was found that the activities of the compounds to kill the larvae of brine shrimp were fairly correlated with the plant growth inhibitions by the corresponding compounds. Thus, the larvae of brine shrimp were found to be good test animals for monitoring allelopathic compounds.