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Abscisic acid (ABA) production has emerged a susceptibility factor in plant-pathogen interactions. This work examined the interaction of ABA with nitric oxide (NO) in tomato following challenge with the ABA-synthesizing pathogen,  Botrytis cinerea.  Trace gas detection using a quantum cascade laser detected NO production within minutes of challenge with  B. cinerea  whilst photoacoustic laser detection detected ethylene production – an established mediator of defense against this pathogen – occurring after 6 h. Application of the NO generation inhibitor  N -Nitro- L -arginine methyl ester ( L -NAME) suppressed both NO and ethylene production and resistance against  B. cinerea . The tomato mutant  sitiens  fails to accumulate ABA, shows increased resistance to  B. cinerea  and we noted exhibited elevated NO and ethylene production. Exogenous application of  L -NAME or ABA reduced NO production in  sitiens  and reduced resistance to  B. cinerea.  Increased resistance to  B. cinerea  in  sitiens  have previously been linked to increased reactive oxygen species (ROS) generation but this was reduced in both  L -NAME and ABA-treated  sitiens.  Taken together, our data suggests that ABA can decreases resistance to  B. cinerea  via reduction of NO production which also suppresses both ROS and ethylene production.

ABA Suppresses Botrytis cinerea Elicited NO Production in Tomato to Influence H2O2 Generation and Increase Host Susceptibility