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Get closer and make hotspots: liquid–liquid phase separation in plants

Liquid–liquid phase separation (LLPS) facilitates the formation of membraneless compartments in a cell and allows the spatiotemporal organization of biochemical reactions by concentrating macromolecules locally. In plants, LLPS defines cellular reaction hotspots, and stimulus‐responsive LLPS is tightly linked to a variety of cellular and biological functions triggered by exposure to various internal and external stimuli, such as stress responses, hormone signaling, and temperature sensing. Here, we provide an overview of the current understanding of physicochemical forces and molecular factors that drive LLPS in plant cells. We illustrate how the biochemical features of cellular condensates contribute to their biological functions. Additionally, we highlight major challenges for the comprehensive understanding of biological LLPS, especially in view of the dynamic and robust organization of biochemical reactions underlying plastic responses to environmental fluctuations in plants.