Salicylic acid is not the translocated signal responsible for inducing systemic acquired resistance but is required in signal transduction. - Vernooij, ,B.,.; Friedrich, ,L.,.; Morse, ,A.,.; Reist, ,R.,.; Kolditz Jawhar, ,R.,.; Ward, ,E.,.; Uknes, ,S.,.; Kessmann, ,H.,.; and Ryals, ,J.. (Plant Cell, 1994)