Electrophoretic analysis and staining of PPO activity of BSTN and
JHL roots samples revealed the same pattern with isoenzymes
ranging from 0.06 to 0.8 Rm values (Fig. 5). Neither Foa infection
nor JA treatment induced qualitative differences as compared to untreated samples. However, they enhanced the activity of isoen-
zymes with Rmvalue 0.7 and 0.75 after 2 weeks of incubation. PPO
activity staining decreased in all isoforms in the case of symp-
tomatic plants