STUDY ON ISOLATION, IDENTIFICATION AND BIOACTIVITY OF ALLELOCHEMICALS IN RHIZOSPHERE
根际区他感化学物质的分离、鉴定与生物活性的研究

This paper described the results of effects of some allelochemical in the rhizosphere soil solution on seed germination and seedling growth of some crops and weeds. Those extracts of samples showed bioactivity were select6d for GC-MS analysis, More than 50 different chemicals were identified, Three chemicals have been studied in some details to evaluated their aLlelopathic effect on the germination, root and seeding groWth of wheat, maize, barnyard brass and sesban. It was not found up to now that published 4-tert-butylbenzoic acid showed allelop4thic activity. At concentration of 50 mg/l, allochemicals inhibited all seeds, and the inhibitlug effects increased with concentration. The germination rate of wheat and maize seeds was culy 41 % and 7% of the control at concentration 50 mg/l, respectively. Benzaldehyde showed a mediate allelopathic activity. It inhibited the sprout of seeds at concentration over 200 mg/l,. tetradecent-1 was not considered as an allelochemical. It didn' t show any bioactivity for the tested seeds even though the solution concentration as high as 2000 mg/l.