Abstract:

The phenylalanine ammonialyase (PAL) speciaific activity in the healthy bark of Castanea henryi were not relative to the variety resistance, the PAL specific activity all increased in the different resistant varieties after inoculation, at 144hr the PAL specific activity in the resistant varieties were higher than that in the susceptible ones after inoculation. The contents of lignin in the resistant varieties were all higher than that in the susceptible ones before and after inoculation. The contents of chlorogenic acid in Castanea henryi were not relative to the resistance to the blight. So, the PAL specific activity after inoculation in bark could be used as the criterion to evaluate the disease resistance.

Key words: Castanea henryi, Cryphonectria parasitica, Disease resistance, Phenylalanine ammonialyase