Böhlenius Henrik, Huang Tao, Charbonnel-Campaa Laurence, Brunner Amy M, Jansson Stefan, Strauss Steven H, Nilsson Ove
Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, S-90183 Umeå, Sweden.
Science. 2006 May 19;312(5776):1040-3. doi: 10.1126/science.1126038. Epub 2006 May 4.
Forest trees display a perennial growth behavior characterized by a multiple-year delay in flowering and, in temperate regions, an annual cycling between growth and dormancy. We show here that the CO/FT regulatory module, which controls flowering time in response to variations in daylength in annual plants, controls flowering in aspen trees. Unexpectedly, however, it also controls the short-day-induced growth cessation and bud set occurring in the fall. This regulatory mechanism can explain the ecogenetic variation in a highly adaptive trait: the critical daylength for growth cessation displayed by aspen trees sampled across a latitudinal gradient spanning northern Europe.
林木表现出多年生生长行为，其特征是开花有多年延迟，并且在温带地区，生长和休眠之间存在年度循环。我们在此表明，在一年生植物中响应日照长度变化控制开花时间的CO/FT调控模块，也控制着杨树的开花。然而，出乎意料的是，它还控制着秋季短日照诱导的生长停止和芽形成。这种调控机制可以解释一个高度适应性性状的生态遗传变异：在跨越北欧的纬度梯度上采样的杨树所表现出的生长停止临界日照长度。
