Coumarins, the secondary metabolites, have a role in the stress resistance in plants.

本研究的重点是香豆素在植物中的作用。香豆素生物合成关键酶的可视化显示了其生物合成的空间细节。在真菌或激发子刺激感染后，在感染区周围发现了局部诱导香豆素生物合成的现象。对李树根际香豆素的降解进行了检测，并在根际分离到香豆素降解微生物。香豆素降解微生物仅从李树周围土壤中分离得到。这一结果表明了香豆素对植物与微生物的相互作用。确定了这些微生物对香豆素的降解途径。降解中间体对其他微生物和植物无活性。

This study focused on the role of coumarins in plants. Visualization of the key enzyme of coumarin biosynthesis showed spacial detail of its biosynthesis. After infectious stimulation by fungus or elicitors, local induction of coumarin biosynthesis was found around the area of infection.Coumarin degradation in the rhizosphere of Prunus sp. was detected, where coumarin-degrading microbes were isolated. The coumarin degrading microbes were isolated from soil only around Prunus tree. This result indicates the interaction between the plant and the microbe by coumarin.Coumarin degradation pathway by these microbes were determined. The intermediates of degradation showed no activity to other microbes and plants.