Abstract:

The results showed that the contents of free serine、glutamate、proline、alanine、cystine、valine、isoleucine and total amino acid in the resistant varieties after inoculation during incubation period gradually decreased and reached the lowest point at 168 h after inoculation,the contents of the free aspartate、threonine、serine、glycine、alanine、cystine、valine、isoleucine、leucine、phenylalanine and total amino acid in the middle resistant varieties gradually decreased and reached the lowest point at 168 h,the content of free glutamate in the middle susceptible varieties after inoculation during incubation period gradually increased and reached the highest point at 168 h,other kinds of amino acid in the middle susceptible varieties didn′t show regular changes,the content of free proline in the susceptible varieties after inoculation during incubation period gradually increased and the other kinds of amino acid didn′t show regular changes.Before inoculation the contents of total free amino acid in different resistant varieties didn′t show regular changes,but those of free alanine and cystine were positively relative to the susceptibility of the host,and that of the free phenylalanine were positively relative to the resistance of the variety.At 168h after inoculation the contents of free proline\,glutamate\,serine\,glycine\,alanine and cystine were negatively relative to the resistance of variety.

Key words: Castanea henryi, Chestnut blight, Free amino acid, Resistance