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CO/FT Regulatory Module Controls Timing of Flowering and Seasonal Growth Cessation in Trees
Henrik Böhlenius,1Tao Huang,1Laurence Charbonnel-Campaa,1Amy M. Brunner,2,4Stefan Jansson,3Steven H. Strauss,4Ove Nilsson1*
Forest trees display a perennial growth behavior characterizedby a multiple-year delay in flowering and, in temperate regions,an annual cycling between growth and dormancy. We show herethat the CO/FT regulatory module, which controls flowering timein response to variations in daylength in annual plants, controlsflowering in aspen trees. Unexpectedly, however, it also controlsthe short-dayinduced growth cessation and bud set occurringin the fall. This regulatory mechanism can explain the ecogeneticvariation in a highly adaptive trait: the critical daylengthfor growth cessation displayed by aspen trees sampled acrossa latitudinal gradient spanning northern Europe.
1 Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, S-90183 Umeå, Sweden. 2 Virginia Tech Department of Forestry, Virginia Polytechnic Institute and State University, Blacksburg, VA 240610324, USA. 3 Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, S-90187 Umeå, Sweden. 4 Department of Forest Science, Oregon State University, Corvallis, OR 973315752, USA.
* To whom correspondence should be addressed. Email: Ove.Nilsson{at}genfys.slu.se
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