Treatment of ethylacetate extract of Asiasarum sieboldi inhibited the germination and the growth of radish seeds. Two phenylpropanoids were isolated from ethylacetate extract. Their structures were identified as safrole and o-methyleugenol by spectroscopic evidence. From the test to inhibitory effect, o-methyleugenol had inhibited the germination and the growth of radish seeds, while safrole did not. The germination rate and radicle length of radish seeds were decreased to 63.0%, 31.5 % of control at 5mg/ml of o-methyleugenol, respectively. At the same concentration, o-methyleugenol inhibited the hypocotyl growth up to 100%.
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