Abstract
In roots of potato (Solanum tuberosurn X S. tuberosum subsp. andigena) resistant to H. rostochiensis pathotype A, higher activities of both phenylalanine ammonia-lyase (PAL) and tyrosine ammonia-lyase (TAL) were found than in roots of susceptible potato. After infection of roots with H. rostochiensis larvae, the activity of these enzymes increased being greater in resistant plants. Both trans-cinnamic acid and p-coumaric acid products of PAL and TAL activity, respectively, caused some resistant reaction to H. rosiochiensis after their introduction into potato plants. The possible role of the two de-aminases in potato resistance to H. rosiochiensis is discussed.
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