Superoxide Anion Generation: A Response of Potato Leaves to Infection withPhytophthora infestans

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Abstract
In potato leaves [Solanum tuberosum] inoculated by a zoospore suspension of Phytophthora infestans, O2- generation appeared at two stages, before and after fungus penetration. The former reaction was only temporal in leaves that were inoculated with either the compatible or incompatible races of P. infestans. This reaction was also activated by zoospore germination fluid. The later reaction, however, was characteristic of the incompatible, but not the compatible interactions, with respect to the occurrence of a hypersensitive cell reaction following fungus penetration. An O2- generating reaction before fungus penetration was also found to be activated in some nonhost plant leaves that were either inoculated with the fungus or treated with the germination fluid. However, a few penetrating fungi in these nonhost plants resulted in no detection of enhanced O2- generation after fungus penetration. These results suggest that intact leaves may recognize some substance released from germinating spores that activates an O2- generating reaction, and that further activation of O2- generating reaction may occur in potato leaf tissues in close association with a hypersensitive reaction elicited by penetration by incompatible races of P. infestans.

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