Ubiquitin-mediated proteolysis is an integral part of diverse cellular functions. As a component of the ubiquitin conjugation system, E3 ubiquitin ligase is the key element determining the substrate specificity of ubiquitination. E3 ligase plays an important role against various environmental stresses such as drought, salinity, chilling, and pathogen attack and has a function in plant growth and development. There are 4 different types of E3 ubiquitin ligases: RING, U-box, HECT, and F-box. We summarize the ...