Fig. 2.

NO production in Psph- and Pt-inoculated -fed and -fed tobacco. (A) NO production in -fed and -fed tobacco leaves challenged with avirulent Psph or virulent Pt measured using a QCL. No NO was detected in tobacco leaves infiltrated with 10mM MgCl₂ (data not shown). In these experiments, the tobacco plants were grown in low-nutrient compost supplemented with or . (B) The results were partially replicated in hydroponically grown plants challenged with Psph where NO production was measured using chemiluminescence detection. Data from the QCL represent the results of three separate experiments. Data from chemiluminescence represent results from two independent experiments.