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Enhanced Fitness Conferred by Naturally Occurring Variation in the Circadian Clock
Todd P. Michael,1Patrice A. Salomé,1Hannah J. Yu,1Taylor R. Spencer,1Emily L. Sharp,1Mark A. McPeek,1José M. Alonso,2*Joseph R. Ecker,2C. Robertson McClung1
Natural variation in clock parameters is necessary for the circadianclock to contribute to organismal fitness over a broad geographicrange. Considerable variation is evident in the period, phase,and amplitude of 150 Arabidopsis accessions, and the periodlength is correlated with the day length at the latitude oforigin, implying the adaptive significance of correctly regulatedcircadian timing. Quantitative trait loci analysis of recombinantinbred lines indicates that multiple loci interact to determineperiod, phase, and amplitude. The loss-of-function analysisof each member of the ARABIDOPSIS PSEUDO-RESPONSE REGULATORfamily suggests that they are candidates for clock quantitativetrait loci.
1 Dartmouth College, Department of Biological Sciences, Hanover, NH 03755, USA. 2 Plant Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
* Present address: Department of Genetics, Box 7614, North CarolinaState University, Raleigh, NC 27695, USA.
To whom correspondence should be addressed. E-mail: mcclung{at}dartmouth.edu
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