Comparative Proteomics Combined with Morphophysiological Analysis Revealed Chilling Response Patterns in Two...

Area of Science:

• Plant Science
• Proteomics
• Agricultural Science

Background:

• Low temperatures, or chilling stress, significantly affect maize yield, particularly during the critical seedling stage.
• Understanding the molecular mechanisms, specifically protein expression changes, is vital for developing chilling-tolerant maize varieties.
• Current knowledge on protein-level responses to chilling stress in maize seedlings is limited, hindering breeding efforts.

Purpose of the Study:

• To comprehensively analyze the physiological and proteomic changes in maize seedlings under chilling stress.
• To identify specific proteins and signaling pathways involved in chilling tolerance.
• To investigate the role of abscisic acid (ABA) in maize seedling response to chilling stress.

Main Methods:

• Comparative proteomics analysis of tolerant (KR701) and sensitive (hei8834) maize inbred lines.
• Physiological assays and phytohormone abscisic acid (ABA) measurements at different seedling stages (first and third leaf).
• Chilling stress treatment applied to maize seedlings.

Main Results:

• Identified several signaling proteins and pathways responsive to chilling stress in maize seedlings.
• Demonstrated the importance of the ABA pathway for chilling resistance in the tolerant line (KR701) at the first leaf stage.
• Catalogued chilling-responsive proteins, providing a valuable resource for further research.

Conclusions:

• The study elucidates key protein-level responses to chilling stress in maize seedlings.
• The abscisic acid (ABA) pathway plays a significant role in chilling tolerance at early developmental stages.
• The identified proteins and pathways offer a foundation for marker-assisted selection and breeding of improved maize varieties resistant to cold stress.