Dear Colleagues,

Adverse changes in environmental factors (e.g., light intensity, temperature, water content, or mechanical actions) ranging across wide time intervals are the essential characteristics of a plant’s life. The fast changes (from seconds to hours and days) in these factors are especially dangerous. These changes require complex adaptive responses of the main physiological processes including the expression of genes, photosynthesis, respiration, water exchange, the synthesis of biochemical compounds, and many others. The activation of a plant’s stress signaling mechanisms is a necessary stage connecting the impacts of environmental factors and the adaptive responses of plants. There are different spatial levels of the stress signaling in plants (from a cell level to the level of the whole organism); these signals can be based on Ca²⁺, H⁺, and K⁺ fluxes, ROS production, hydraulic waves, electrical responses, the synthesis of phytohormones, and other processes. Detailed investigations of the phenomenology of these signals, revealing mechanisms of their formation and influence on physiological processes, as well as analyses of the interactions between these signals in the induction of adaptation responses of plants and the development of new methods of plant monitoring based on this stress signaling are topical problems of plant physiology. These problems are complex; their solution requires both experimental investigations and simulations. This Special Issue of Plants will highlight all aspects of the stress signaling in plants under fast changes in environmental factors. Reviews and research articles focused on a complex analysis of the stress signaling in plants will be especially appreciated for this Special Issue.

• Stress signaling in plants
• adverse factors
• fast environmental changes
• physiological processes
• adaptive responses
• simulation