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A previous paper1) reported that the rishitin synthetic pathway was activated in the healthy tissue about 2mm in thickness adjacent to the cut surface tissue of potato tuber infected by an incomatible race of P. infestans within 2 days after cutting and inocula tion. In another study2), we reported that the rishitin synthetic pathway had been under operation in tissue slices of potato tuber buds and also in those of shoots sprouted from potato tubers within 10 min after slicing. These results suggested that the rishitin synthetic pathway may operate in amount detectable with an isotope in an intact young potato tissue which is metabolically active. These findings imply that the onset of rishitin synthesis does not need stress such as infection, or treatment with chemicals or hyphal wall components (HWC) and so on. Many reports3,4) have indicated that hyphal wall components (HWC) of pathogenic fungi elicited accumulation (or production) of phytoalexins. These rather contradictory findings pose a question as to whether HWC accelerate the activity of an active rishitin synthetic pathway or not. In the experiments reported here, we tried to clarify whether HWC activates or inhibits the synthetic pathway of rishitin in a cell exposed directly to HWC.

nippon shokubutsu byori gakkaiho/nihon shokubutsu byouri gakkaihou

Effect of hyphal wall component of Phytophthora infestans on activity of rishitin synthetic pathway in a potato cell exposed directly to the component.