Key points are not available for this paper at this time.
John A. Ryals, Urs H. Neuenschwander, Michael G. Willits, Antonio Molina, Henry-York Steiner, Michelle D. Hunt, Systemic Acquired Resistance, The Plant Cell, Vol. 8, No. 10, Special Review Issue on Plant-Microbe Interactions (Oct., 1996), pp. 1809-1819
Ryals et al. (Tue,) studied this question.