Extracts obtained from Cryptomeria japonica leaves were tested for growth inhibition activity against Robinia pseudoacacia seeds, which is known as a representative invasive plant in temperate forests. Inhibitory activities against radicle and hypocotyl growth were found in hexane and ethyl acetate extracts but showed no or weak activity on seed germination. The extracts also showed inhibitory activity against Trifolium repens as a representative weed. The active extracts were fractionated by silica gel column chromatography and cryptomeridiol was isolated as an active compound. Comparison of activities between cryptomeridiol and β-eudesmol indicated that the diol structure of the eudesmane skeleton was important in causing the inhibitory activities.

测试了从日本柳杉叶获得的提取物对刺槐种子的生长抑制活性，刺槐种子被称为温带森林中的代表性入侵植物。在己烷和乙酸乙酯提取物中发现了对胚根和下胚轴生长的抑制活性，但对种子发芽没有抑制作用或弱。提取物还显示出对作为代表杂草的白三叶的抑制活性。通过硅胶柱色谱法分离活性提取物，并分离隐隐美二醇作为活性化合物。隐美体二醇和β-大麦醇的活性比较表明，杜仲骨架的二醇结构对引起抑制活性很重要。