Bernard Vernooij, Leslie Friedrich, Alison Morse, Roland Reist, Rachida Kolditz-Jawhar, Eric Ward, Scott Uknes, Helmut Kessmann, John Ryals, Salicylic Acid Is Not the Translocated Signal Responsible for Inducing Systemic Acquired Resistance but Is Required in Signal Transduction, The Plant Cell, Vol. 6, No. 7 (Jul., 1994), pp. 959-965
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Vernooij et al. (1994) studied this question.