The MdGLK1-MdBZR1 Module Integrates Ethylene and Strigolactone Signals to Regulate Cold Tolerance via a CBF-Dependent...

Area of Science:

• Plant Biology
• Molecular Biology
• Stress Physiology

Background:

• Ethylene and strigolactone (SL) are crucial for plant cold tolerance.
• The molecular interactions between ethylene and SL signaling pathways under cold stress are not well understood.

Purpose of the Study:

• To identify key regulators integrating ethylene and SL signaling in apple's cold stress response.
• To elucidate the molecular mechanism of cold tolerance mediated by these signaling pathways.

Main Methods:

• Identification of transcription factors involved in cold stress response.
• Analysis of protein-protein interactions and gene regulation.
• Investigating the role of specific signaling components in cold tolerance.

Main Results:

• GOLDEN2-LIKE1 (MdGLK1) acts as a central integrator of ethylene and SL signaling.
• MdGLK1 recruits BRASSINAZOLE-RESISTANT1 (MdBZR1) to activate cold-responsive genes (MdCBF1, MdCBF2).
• Ethylene signaling (via MdEBF1) and SL signaling repressors (MdSMXL8) negatively regulate MdGLK1 activity and cold tolerance.

Conclusions:

• The MdGLK1-MdBZR1-MdCBF1/2 module integrates ethylene and SL pathways for cold adaptation in apple.
• MdGLK1's role in coordinating these signals provides insights into optimizing plant growth and stress tolerance.