Isolation and characterization of a C-repeat binding transcription factor from maize

Area of Science:

• Plant Molecular Biology
• Plant Physiology
• Genetics

Background:

• C-repeat binding factors (CBFs) are crucial transcription factors for plant stress tolerance.
• CBFs activate cold-regulated genes by binding to specific cis-elements, enabling cold acclimation.
• Understanding plant stress response mechanisms is vital for agricultural resilience.

Purpose of the Study:

• To isolate and characterize a novel C-repeat binding transcription factor from maize.
• To determine the DNA-binding specificity and expression patterns of the identified maize CBF.
• To elucidate the role of this transcription factor in maize stress response.

Main Methods:

• Yeast one-hybrid system for transcription factor isolation.
• C-repeat motif from Arabidopsis COR15a promoter used as bait.
• Point mutation analyses to identify the core binding sequence.
• Abscisic acid and low-temperature treatments for expression analysis.

Main Results:

• A maize C-repeat binding transcription factor, designated ZmCBF3, was successfully isolated.
• The core binding sequence for ZmCBF3 was identified as (A/G)(C/T)CGAC.
• ZmCBF3 expression was induced by abscisic acid and low temperature.
• ZmCBF3 showed active expression during maize embryogenesis.

Conclusions:

• ZmCBF3 is a novel maize transcription factor homologous to Arabidopsis CBF3.
• ZmCBF3 plays a significant role in maize's response to environmental stresses, including cold and dehydration.
• The findings contribute to understanding the genetic basis of stress tolerance in crops.