title: Multi-Level Interactions Between Heat Shock Factors, Heat Shock Proteins, and the Redox System Regulate Acclimation to Heat.
abstract: High temperature has become a global concern because it seriously affects the growth and reproduction of plants. Exposure of plant cells to high temperatures result in cellular damage and can even lead to cell death. Part of the damage can be ascribed to the action of reactive oxygen species (ROS), which accumulate during abiotic stresses such as heat stress. ROS are toxic and can modify other biomacromolecules including membrane lipids, DNA, and proteins. In order to protect the cells, ROS scavenging is essential. In contrast with their inherent harms, ROS also function as signaling molecules, inducing stress tolerance mechanisms. This review examines the evidence for crosstalk between the classical heat stress response, which consists of heat shock factors (HSFs) and heat shock proteins (HSPs), with the ROS network at multiple levels in the heat response process. Heat stimulates HSF activity directly, but also indirectly via ROS. HSFs in turn stimulate the expression of HSP chaperones and also affect ROS scavenger gene expression. In the short term, HSFs repress expression of superoxide dismutase scavenger genes via induction of miRNA398, while they also activate scavenger gene expression and stabilize scavenger protein activity via HSP induction. We propose that these contrasting effects allow for the boosting of the heat stress response at the very onset of the stress, while preventing subsequent oxidative damage. The described model on HSFs, HSPs, ROS, and ROS scavenger interactions seems applicable to responses to stresses other than heat and may explain the phenomenon of crossacclimation.
authors.affiliation: Department of Molecular Plant Physiology, Institute for Water and Wetland Research, Radboud University , Nijmegen, Netherlands.
authors.forename: Nicky
authors.initials: N
authors.lastname: Driedonks
authors.affiliation: Department of Molecular Plant Physiology, Institute for Water and Wetland Research, Radboud University , Nijmegen, Netherlands.
authors.forename: Jiemeng
authors.initials: J
authors.lastname: Xu
authors.affiliation: Department of Molecular Plant Physiology, Institute for Water and Wetland Research, Radboud University , Nijmegen, Netherlands.
authors.forename: Janny L
authors.initials: JL
authors.lastname: Peters
authors.affiliation: Department of Horticulture, Forestry and Recreation Resources, Kansas State University , Manhattan, KS, USA.
authors.forename: Sunghun
authors.initials: S
authors.lastname: Park
authors.affiliation: Department of Molecular Plant Physiology, Institute for Water and Wetland Research, Radboud University , Nijmegen, Netherlands.
authors.forename: Ivo
authors.initials: I
authors.lastname: Rieu
keywords: ROS scavenging; cross-talk; heat response; heat shock factor; heat shock protein; interaction; reactive oxygen species; signaling