development, and physiological responses. Ubiquitylated plasma membrane proteins are internalized by endocytosis and delivered to endosomes, where they are sorted by the ESCRT (Endosomal Sorting Complex Required for Transport) machinery into endosome intralumenal vesicles for their final degradation in the vacuole. Besides their role in endosomal sorting, ESCRT proteins play other essential functions by remodeling cellular membranes during cytokinesis, plasma membrane wound repair, nuclear envelope reformation after mitosis, autophagy. I will discuss the diversification and functional specialization of plant ESCRT proteins and a novel membrane remodeling mechanism operating in plant endosomes.