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New Phytologist

Manas R. Prusty 

Eyal Bdolach  

Eiji Yamamoto  

Lalit D. Tiwari  

Roi Silberman  

Adi Doron‐Faigenbaum  

Jeffrey L. Neyhart  

David Bonfil  

Khalil Kashkush  

Klaus Pillen  

Kevin P. Smith  

Eyal Fridman

Summary

 

  • Circadian clock rhythms shown to be interwind with crop adaptation. To realize the adaptive value of changes in these rhythms under crop domestication and improvement there is a need to compare the genetics of clock and yield traits.
  • We compared circadian clock rhythmicity based on Chlorophyll leaf fluorescence and transcriptomics among wild ancestors, landraces and breeding lines of barley under optimal and high temperatures. We conducted a genome scan to identify pleiotropic loci regulating the clock and field phenotypes. We also compared the allelic diversity in wild and cultivated barley to test for selective sweeps.
  • We found significant loss of thermal plasticity in circadian rhythms under domestication. However, transcriptome analysis indicated that this loss was only for output genes, and that temperature compensation in the core clock machinery was maintained. Drivers of the circadian clock (DOC) loci were identified via GWAS and, notably, these loci also modified growth and reproductive outputs in the field. Diversity analysis indicated selective sweep in these pleiotropic DOC loci.
  • These results indicate a selection against thermal clock plasticity under barley domestication and improvement, and highlights importance of identifying genes underlying for understanding the biochemical basis of crop adaptation to changing environments.
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Genetic loci mediating circadian clock output plasticity and crop productivity under barley domestication

Manas R. Prusty 

Eyal Bdolach  

Eiji Yamamoto  

Lalit D. Tiwari  

Roi Silberman  

Adi Doron‐Faigenbaum  

Jeffrey L. Neyhart  

David Bonfil  

Khalil Kashkush  

Klaus Pillen  

Kevin P. Smith  

Eyal Fridman

Genetic loci mediating circadian clock output plasticity and crop productivity under barley domestication

Summary

 

  • Circadian clock rhythms shown to be interwind with crop adaptation. To realize the adaptive value of changes in these rhythms under crop domestication and improvement there is a need to compare the genetics of clock and yield traits.
  • We compared circadian clock rhythmicity based on Chlorophyll leaf fluorescence and transcriptomics among wild ancestors, landraces and breeding lines of barley under optimal and high temperatures. We conducted a genome scan to identify pleiotropic loci regulating the clock and field phenotypes. We also compared the allelic diversity in wild and cultivated barley to test for selective sweeps.
  • We found significant loss of thermal plasticity in circadian rhythms under domestication. However, transcriptome analysis indicated that this loss was only for output genes, and that temperature compensation in the core clock machinery was maintained. Drivers of the circadian clock (DOC) loci were identified via GWAS and, notably, these loci also modified growth and reproductive outputs in the field. Diversity analysis indicated selective sweep in these pleiotropic DOC loci.
  • These results indicate a selection against thermal clock plasticity under barley domestication and improvement, and highlights importance of identifying genes underlying for understanding the biochemical basis of crop adaptation to changing environments.
Scientific Publication
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