The plasma membrane as a mechanotransducer in plants.

Abstract

The plasma membrane is a physical boundary made of amphiphilic lipid molecules, proteins and carbohydrates extensions. Its role in mechanotransduction generates increasing attention in animal systems, where membrane tension is mainly induced by cortical actomyosin. In plant cells, cortical tension is of osmotic origin. Yet, because the plasma membrane in plant cells has comparable physical properties, findings from animal systems likely apply to plant cells too. Recent results suggest that this is indeed the case, with a role of membrane tension in vesicle trafficking, mechanosensitive channel opening or cytoskeleton organization in plant cells. Prospects for the plant science community are at least three fold: (i) to develop and use probes to monitor membrane tension in tissues, in parallel with other biochemical probes, with implications for protein activity and nanodomain clustering, (ii) to develop single cell approaches to decipher the mechanisms operating at the plant cell cortex at high spatio-temporal resolution, and (iii) to revisit the role of membrane composition at cell and tissue scale, by considering the physical implications of phospholipid properties and interactions in mechanotransduction.