Fig. 3.

SA and several structurally and/or functionally related synthetic compounds induce SAR. a The chemical structures are depicted. b BTH treatment suppresses powdery mildew caused by Blumeria graminis in wheat. Arrows point to the white, powdery-like spots/blotches on the leaves of untreated wheat (Control), which turn yellow and die, whereas the leaves of BTH-treated wheat remain healthy after infection. The picture in (b) is copyrighted by the American Society of Plant Biologists and is reprinted from [112], and modified slightly, with the author’s and American Society of Plant Biologists’ permission