Preparing plants for improved cold tolerance by priming.

Area of Science:

• Plant Physiology
• Stress Biology
• Molecular Plant Science

Background:

• Cold temperatures significantly limit plant growth globally, particularly in temperate regions.
• Plant priming, a stress memory phenomenon, enhances tolerance to chilling temperatures after brief stress events.
• Priming does not alter inherent cold sensitivity but modifies the plant's response to cold stress.

Purpose of the Study:

• To investigate the mechanisms underlying plant priming for enhanced cold tolerance.
• To identify key molecular factors involved in stress memory and cold acclimation.
• To understand how priming integrates into cold-induced signaling pathways.

Main Methods:

• Comparative analysis of experimental studies on plant priming.
• Identification of elicitor factors and antagonists involved in stress response.
• Investigation of the role of reactive oxygen species (ROS/RNS), plant hormones, and signaling metabolites.

Main Results:

• Priming involves the accumulation of elicitors and antagonists through altered biosynthesis or degradation.
• Key regulators include ROS/RNS, antioxidant enzymes, jasmonates, salicylates, abscisic acid, beta- and gamma-aminobutyric acid (BABA and GABA), and melatonin.
• These factors modify both local and systemic cold tolerance.

Conclusions:

• Priming enhances plant cold tolerance via a stress memory mechanism.
• Elicitors and antagonists play crucial roles in mediating the effects of priming.
• Integration of these factors into cold-induced signaling cascades is essential for improved tolerance.