Endo, J., Takahashi, W., Yokoyama, M. and Tanaka, O. 2013. Induction of gene expression for systemic acquired resistance in tobacco by 9-hydroxy-10-oxo-12(Z),15(Z)-octadecadienoic acid (KODA). Can. Plant Sci. 93: 827-830. The reaction of 9-hydroxy-10-oxo-12(Z),15(Z)-octadecadienoic acid (KODA) with (-)-norepinephrine (NE) generates the flowering inducer FN1 of duckweed Lemna paucicostata, although KODA and NE themselves do not promote flowering. We examined the effects of FN1, KODA, and NE on the induction of gene expression for systemic acquired resistance (SAR) in tobacco (Nicotiana tabacum) leaves and found that KODA induces the expression of SAR related genes.