Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 87, Umeå, Sweden.
School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI, 49931, USA.
Nat Commun. 2018 Oct 9;9(1):4173. doi: 10.1038/s41467-018-06696-y.
In boreal and temperate ecosystems, temperature signal regulates the reactivation of growth (bud break) in perennials in the spring. Molecular basis of temperature-mediated control of bud break is poorly understood. Here we identify a genetic network mediating the control of bud break in hybrid aspen. The key components of this network are transcription factor SHORT VEGETATIVE PHASE-LIKE (SVL), closely related to Arabidopsis floral repressor SHORT VEGETATIVE PHASE, and its downstream target TCP18, a tree homolog of a branching regulator in Arabidopsis. SVL and TCP18 are downregulated by low temperature. Genetic evidence demonstrates their role as negative regulators of bud break. SVL mediates bud break by antagonistically acting on gibberellic acid (GA) and abscisic acid (ABA) pathways, which function as positive and negative regulators of bud break, respectively. Thus, our results reveal the mechanistic basis for temperature-cued seasonal control of a key phenological event in perennial plants.
在北方和温带生态系统中，温度信号调节多年生植物在春季的生长（芽休眠）重新激活。温度介导的芽休眠控制的分子基础理解甚少。在这里，我们鉴定了一个在杂种山杨中介导芽休眠控制的遗传网络。该网络的关键组成部分是转录因子短营养生长阶段类似物（SVL），它与拟南芥花抑制物短营养生长阶段类似物密切相关，以及其下游靶标 TCP18，这是拟南芥分枝调节剂的树同源物。SVL 和 TCP18 受低温下调。遗传证据证明了它们作为芽休眠负调节剂的作用。SVL 通过拮抗作用于赤霉素（GA）和脱落酸（ABA）途径来介导芽休眠，赤霉素和脱落酸分别作为芽休眠的正调节剂和负调节剂。因此，我们的结果揭示了温度提示对多年生植物关键物候事件季节控制的机制基础。
Zotero 插件
