The importance of NO in plant resistance has been well documented.
The treatment of NO donors to tobacco plants or tobacco
suspension cells induces the expression of the phenylalanine
ammonia lyase (PAL) gene and the pathogenesis-related protein 1
(PR1) gene [35]. Additionally, the accumulation of cellular NO
content changes SNO protein levels and regulates both the increase
in SA and the expression of SA-dependent genes [22,23].
NO accumulation, an increase in SNO protein levels, and SAmediated
defense responses were also observed in the present
study, suggesting that EAWP could trigger a similar process in
tomato plants.