Figure 1

Time course of phenylalanine ammonia-lyase (PAL) activity. The activity was measured in the leaves of control (dotted line) and P. putida BTP1- treated (continuous line) tomato plants before (0), two days (+2), and four days (+4) after challenge with B. cinerea. Statistical analysis (Student's T test, α = 0.05) revealed that differences between control and bacterized plants, at the same infection time, were not significant. Data are means and standard deviations calculated from three measurements on two enzyme extracts.