WAK genes are inducible by SA and wounding; it has been proposed that TaWAK2 modulates pectin methyl esterase 1 (PME1) negatively in wheat, causing a more rigid cell wall, limiting the penetration and spread of Fusarium graminearum [54]; in tomatoes, WAK1 interacts with flagellin, inducing callose deposition and minimizing infection by P. syringae [55,56]. Here, PPME1 is linked to infection.