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Circadian Clock Components Offer Targets for Crop Domestication and Improvement.

C Robertson McClung1

  • 1Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA.

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Plant domestication selected for beneficial alleles, including those in circadian clock genes. These genetic changes improve crop adaptation to new environments and enhance performance, making the circadian clock a key breeding target.

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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.