Effects of Pine Wood Nematode(PWN) Infection on the Activity of PAL and the Content of Phenols in the Host Pine

Taking inoculated slash pine(Pinus elliottii Engelm)and Japanese black pine(Pinus thunbergii Parl)with pine wood nematode [Bursaphelenchus xylophilus(SteinerBuhrer,1934) Nickle] as experimental materials,the effects on the activity of phenylalanine ammonialyase(PAL) and phenols in the pine were investigated.After inoculation,the two pines increased their enzymatic activity of PAL,accompanied with the increase of PAL activity,the increase of the content of total phelonics,and the accumulation of flavonoids.But the changes of PAL activity and secondary metabolites are greater in slash pine.The result shows that these changes may be related to the occurrence and development of the desease.