Under climatic changes plants are confronted by a multitude of abiotic and biotic stress factors. These stresses induce alterations in primary metabolism and may lead to oxidative stress, disruption of osmotic homeostasis, membrane disruptions, and induction of secondary messengers such as Ca²⁺ and ROS. Plant stresses trigger the production of stress-related phytohormones (salicylic acid, abscisic acid, ethylene, and jasmonic acid). Plant stress-induced alterations in endogenous hormonal status, primary metabolism, and specialized metabolites have been widely reported, however, hormonal cross-talk and their interaction with metabolic and/or signaling pathways have not been clearly established.

Significant progress has been made to characterize the plant stress-responsive hormonal alterations of metabolic pathways. Studies have shown that phytohormones interact with ROS in the regulation of proline metabolism, redox control, and Ca²⁺-dependent photosynthesis, as well as with sugar signaling in primary metabolism. These alterations of metabolic pathways are often due to hormonal cross-talk rather than to a single hormone activity. Additionally, hormone-induced innate immunity has an important role in plant-pathogen interactions. However, it has been not yet completely understood the hormonal regulation of the plant stress-responsive symptom development and resistance mechanism: ROS generation; leaf senescence; osmolyte accumulation; biosynthesis de novo/degradation of primary metabolites and their transport; stress cross-signaling; redox-sensing in the hormone-modulated control, etc. In this context, current updates and future perspectives in stress responses and tolerance mechanisms, especially the hormonal regulation of the complex interconnected signaling and metabolic pathways, require further examination.

We welcome studies on recent advances in phytohormone regulation in plant stress responses. We encourage submissions of high-quality original research articles, reviews, mini-reviews, and perspectives papers on the following topics:

• Phytohormone-mediated innate immunity
• Regulatory mechanisms between ROS and phytohormones
• Redox-sensing processes and their hormone-modulated control
• Interaction of sugar and phytohormone signaling
• Ca²⁺-mediated phytohormone signaling
• Phytohormone-mediated signaling pathway in response to stress intensity

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Frontiers in Plant Science

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