Mitogen-activated protein kinases (MAPKs), which are members of the serine/threonine protein kinase family, underwent activation in response to extracellular stimuli through the complex MAPK cascade reaction (MAPKKK-MAPKK-MAPK), which regulates various cellular, physiological and biochemical processes, such as plant growth and development, cell division, and hormone response, as well as adaption to a wide range of biotic and abiotic stresses, including drought, salinity, heat and heavy metal stress, and pathogen infection [3,4,37,38]. Here, WNK2 is linked to infection.