“…The increase in concentration of SA in the upper leaves also occurred later than in the stem parts (Métraux et al, 1990), possibly suggesting a time lag in the translocation of the signal. The transport of signals to the lower, lateral and opposite sides of plants to induce SAR and SA accumulation has suggested the involvement of pathways other than the vascular bundles (Chen et al, 1999;Gessler and Kuć, 1982;Guedes et al, 1980;Jenns and Kuć, 1977;Kiefer and Slusarenko, 2003;Abiko, 2000, 2001;Madi and Katan, 1998;Meuwly et al, 1994;Reglinski et al, 2001;Tjamos, 1979;Xue et al, 1998). The signal is presumed to use both the phloem and alternative pathways.…”