Redox regulation of intercellular transport |
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Authors: | Yoselin Benitez-Alfonso David Jackson Andy Maule |
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Institution: | (1) John Innes Centre, Norwich Research Park, Colney Lane, Norwich, Norfolk, NR4 7UH, UK;(2) Cold Spring Harbor Laboratory, 1 Bungtown road, Cold Spring Harbor, NY 11724, USA |
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Abstract: | Plant cells communicate with each other via plasmodesmata (PDs) in order to orchestrate specific responses to environmental
and developmental cues. At the same time, environmental signals regulate this communication by promoting changes in PD structure
that modify symplastic permeability and, in extreme cases, isolate damaged cells. Reactive oxygen species (ROS) are key messengers
in plant responses to a range of biotic and abiotic stresses. They are also generated during normal metabolism, and mediate
signaling pathways that modulate plant growth and developmental transitions. Recent research has suggested the participation
of ROS in the regulation of PD transport. The study of several developmental and stress-induced processes revealed a co-regulation
of ROS and callose (a cell wall polymer that regulates molecular flux through PDs). The identification of Arabidopsis mutants simultaneously affected in cell redox homeostasis and PD transport, and the histological detection of hydrogen peroxide
and peroxidases in the PDs of the tomato vascular cambium provide new information in support of this novel regulatory mechanism.
Here, we describe the evidence that supports a role for ROS in the regulation of callose deposition and/or in the formation
of secondary PD, and discuss the potential importance of this mechanism during plant growth or defense against environmental
stresses. |
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