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Hui Cao, Scott A. Bowling, A. Susan Gordon, Xinnian Dong, Characterization of an Arabidopsis Mutant That Is Nonresponsive to Inducers of Systemic Acquired Resistance, The Plant Cell, Vol. 6, No. 11 (Nov., 1994), pp. 1583-1592
Cao et al. (Tue,) studied this question.