Circadian clocks and adaptation in Arabidopsis

Shai Yerushalmi, Esther Yakir, Rachel M. Green

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

Endogenous circadian rhythms are almost ubiquitous among organisms from cyanobacteria to mammals and regulate diverse physiological processes. It has been suggested that having an endogenous circadian system enables an organism to anticipate periodic environmental changes and adapt its physiological and developmental states accordingly, thus conferring a fitness advantage. However, it is hard to measure fitness directly and there is, to date, only limited evidence supporting the assumption that having a circadian system can increase fitness and therefore be adaptive. In this article, we report an evolutionary approach to examine the adaptive significance of a circadian system. By crossing Arabidopsis thaliana plants containing mutations that cause changes in circadian rhythms, we have created heterozygous 'Mother' (F1) plants with genetic variance for circadian rhythmicity. The segregating F2 offspring present a range of circadian rhythm periods. We have applied a selection to the F2 plants of short and long T-cycles under different competition strengths and found that the average phenotype of circadian period of the resulting F3 plants show a strong positive correlation with the T-cycle growth conditions for the competing F2 plants. Consistent with their circadian phenotypes, the frequency of long-period alleles was altered in the F3 plants. Our results show that F2 plants with endogenous rhythms that more closely match the environmental T-cycle are fitter, producing relatively more viable offspring in the F3 population. Thus, having a circadian clock that matches with the environment is adaptive in Arabidopsis.

Original languageAmerican English
Pages (from-to)1155-1165
Number of pages11
JournalMolecular Ecology
Volume20
Issue number6
DOIs
StatePublished - Mar 2011

Keywords

  • Arabidopsis thaliana
  • adaptation
  • circadian
  • fitness
  • genes
  • plant

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