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Orchestrating systemic ROS signaling in plants
Localized abiotic stresses induce systemic responses that protect plants from subsequent occurrences of the stress. Fichman et al. found that systemic acclimation to light stress in Arabidopsis thaliana required the enzyme RBOHD locally at sites of high light stress to generate reactive oxygen species (ROS) as well as throughout the plant to propagate a wave of systemic ROS signaling. Light stress–induced systemic ROS signaling depended on proteins localized to plasmodesmata, which are structures that connect the cytoplasm of adjacent plant cells, and was associated with increases in plasmodesmata pore size. Aquaporins and various Ca2+-permeable ion channels facilitated systemic ROS signaling by amplifying the ROS signal in each cell along the path of the ROS wave. Together, these findings demonstrate the importance of cell-to-cell transport mechanisms for generating, amplifying, and propagating systemic ROS signaling in response to high light stress in Arabidopsis.
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