What is the Role of Salicylic Acid?

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Salicylic Acid I would like to suggest is the sixth and final of the
major plant hormones and is the compliment of ABA.

It's role therefore would be an all clear signal after environmental
stress has passed.

The evidence for this is slim but it does reverse stomate closings
caused by ABA. It also Retards senescence (regulatory role) -
probably by inhibiting Ethylene biosynthesis.

Inhibits seed germination - by inhibiting ABA synthesis which is
needed for "hardening" bed.

May also block the wound response and act antagonistically to ABA -
preventing the wound response from spreading further than necessary.