Circadian Clock Components Offer Targets for Crop Domestication and Improvement

Area of Science:

• Plant genetics and breeding
• Circadian biology
• Crop science

Background:

• Plant domestication involves selecting alleles for improved performance in cultivation environments.
• Adaptation to new latitudes requires plants to adjust to different photoperiodic conditions.
• Circadian clock genes influence photoperiodic flowering and other vital plant processes.

Purpose of the Study:

• To explore the role of circadian clock genes in plant domestication and crop improvement.
• To understand how selection on clock genes affects plant adaptation to diverse environments.
• To highlight the potential of the circadian clock as a target for crop breeding.

Main Methods:

• Analysis of allele selection during plant domestication.
• Examination of photoperiodic responses in crops.
• Case study of tomato domestication and clock gene evolution.

Main Results:

• Selection for specific alleles in circadian clock genes has occurred across multiple crops.
• Domestication in tomato led to delayed clock phasing and lengthened period, associated with increased chlorophyll.
• Altered clock function impacts photoperiodic sensitivity and adaptation to new latitudes.

Conclusions:

• The circadian clock is a significant target for crop improvement due to its role in adaptation and performance.
• Selection for modified clock function contributes to expanding crop cultivation ranges.
• Harnessing clock gene variation offers a promising avenue for developing climate-resilient crops.