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Ascorbate peroxidase (APX) acts indispensably in synthesizing L-ascorbate (AsA) which is pivotal to plant stress tolerance by detoxifying reactive oxygen species (ROS). Enhanced activity of APX has been shown to be a key step for genetic engineering of improving plant tolerance. However it needs a deeper understanding on the maintenance of cellular ROS homeostasis in response to stress. In this study, we identified and characterized an  APX  ( CaAPX ) gene from  Camellia azalea . Quantitative real-time PCR (qRT-PCR) analysis showed that  CaAPX  was expressed in all tissues and peaked in immature green fruits; the expression levels were significantly upregulated upon cold and hot stresses. Transgenic plants displayed marked enhancements of tolerance under both cold and heat treatments, and plant growth was correlated with  CaAPX  expression levels. Furthermore, we monitored the activities of several ROS-scavenging enzymes including  Cu/Zn-SOD ,  CAT ,  DHAR , and  MDHAR , and we showed that stress tolerance was synchronized with elevated activities of ROS-scavenging. Moreover, gene expression analysis of ROS-scavenging enzymes revealed a role of  CaAPX  to orchestrate ROS signaling in response to temperature stresses. Overall, this study presents a comprehensive characterization of cellular response related to  CaAPX  expression and provides insights to breed crops with high temperature tolerances.

Overexpression ofCaAPXInduces Orchestrated Reactive Oxygen Scavenging and Enhances Cold and Heat Tolerances in Tobacco