Center for Ecological Research, Kyoto University, Otsu, Japan.
Faculty of Agriculture, Ryukoku University, Otsu, Japan.
Nat Plants. 2019 Jan;5(1):74-83. doi: 10.1038/s41477-018-0338-z. Epub 2019 Jan 7.
As most organisms have evolved in seasonal environments, their environmental responses should be adapted to seasonal transitions. Here we show that the combination of temperature and day length shapes the seasonal dynamics of the transcriptome and adaptation to seasonal environments in a natural habitat of a perennial plant Arabidopsis halleri subsp. gemmifera. Weekly transcriptomes for two years and bihourly diurnal transcriptomes on the four equinoxes/solstices, identified 2,879 and 7,185 seasonally- and diurnally-oscillating genes, respectively. Dominance of annual temperature changes for defining seasonal oscillations of gene expressions was indicated by controlled environment experiments manipulating the natural 1.5-month lag of temperature behind day length. We found that plants have higher fitness in 'natural' chambers than in 'unnatural' chambers simulating in-phase and anti-phase oscillations between temperature and day length. Seasonal temperature responses were disturbed in unnatural chambers. Our results demonstrate how plants use multiple types of environmental information to adapt to seasonal environments.
由于大多数生物体都是在季节性环境中进化而来的，因此它们的环境反应应该适应季节性的转变。在这里，我们展示了温度和日照时间的组合如何塑造多年生植物拟南芥亚种 gemmifera 自然栖息地中转录组的季节性动态和对季节性环境的适应。通过为期两年的每周转录组和四个春分/秋分的每两小时昼夜转录组，分别鉴定出 2879 个和 7185 个季节性和昼夜节律性波动基因。受控环境实验操纵了自然的 1.5 个月的温度滞后于日照时间的方式，表明年度温度变化对定义基因表达季节性波动的主导作用。我们发现，与模拟温度和日照时间之间同相和反相振荡的“非自然”室相比，植物在“自然”室中的适应性更高。在非自然的室内，季节性温度响应受到干扰。我们的研究结果表明了植物如何利用多种类型的环境信息来适应季节性环境。
