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Reactive oxygen species (ROS) are omnipresent and surprisingly not integrated into biological systems. Initially, ROS were merely considered as by-products of aerobic metabolism; however, they have emerged as conserved regulators of physiological and developmental processes in all kingdoms of life. Among ROS, hydrogen peroxide (H2O2) plays a fundamental role in cell signaling and provides oxidative capacity to the endoplasmic reticulum (ER) and the apoplast for normal cellular functioning. H2O2 can cross biological membranes through specialized aquaporins, called peroxiporins. Although the role of peroxiporins in H2O2 transport and signaling is well documented (e.g., yeast, mammals), still little is known about their role in plants. In this chapter, we provide an overview and a perspective on the role of peroxiporins in plant development and their contribution to rapid systemic stress signaling by the …