Effects of Genetic Perturbation on Seasonal Life History Plasticity
Effects of Genetic Perturbation on Seasonal Life History Plasticity
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DOI：
10.1126/science.1165826
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发表时间：
2009-02-13
期刊：
影响因子：
56.9
通讯作者：
Schmitt, Johanna
中科院分区：
文献类型：
--
作者：
Wilczek, Amity M.;Roe, Judith L.;Schmitt, Johanna
像许多物种一样，模式植物拟南芥在自然环境中表现出多种不同的生活史。我们在该物种的欧洲本土范围内的田间实验中培养了不同信号通路受损的突变体，以剖析这种变异的机制。出乎意料的是，除了在夏末的群体中，与开花的冷需求有关的基因座的突变损失对生活史几乎没有影响。一个遗传学上的光热模型解释了大部分观察到的变化，并预测了夏末萌发植物从秋季开花到春季开花的突然过渡。环境信号控制着这一转变的时间，创造了一个对遗传和气候变化敏感的关键窗口，这可能是季节性调节生活史特征的共同点。
Like many species, the model plant Arabidopsis thaliana exhibits multiple different life histories in natural environments. We grew mutants impaired in different signaling pathways in field experiments across the species' native European range in order to dissect the mechanisms underlying this variation. Unexpectedly, mutational loss at loci implicated in the cold requirement for flowering had little effect on life history except in late- summer cohorts. A genetically informed photothermal model of progression toward flowering explained most of the observed variation and predicted an abrupt transition from autumn flowering to spring flowering in late- summer germinants. Environmental signals control the timing of this transition, creating a critical window of acute sensitivity to genetic and climatic change that may be common for seasonally regulated life history traits.