Love John, Dodd Antony N, Webb Alex A R
Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, UK.
Plant Cell. 2004 Apr;16(4):956-66. doi: 10.1105/tpc.020214. Epub 2004 Mar 18.
We have tested the hypothesis that circadian oscillations in the concentration of cytosolic free calcium ([Ca2+]cyt) can encode information. We imaged oscillations of [Ca2+]cyt in the cotyledons and leaves of Arabidopsis (Arabidopsis thaliana) that have a 24-h period in light/dark cycles and also constant light. The amplitude, phase, and shape of the oscillations of [Ca2+]cyt and [Ca2+]cyt at critical daily time points were controlled by the light/dark regimes in which the plants were grown. These data provide evidence that 24-h oscillations in [Ca2+]cyt encode information concerning daylength and light intensity, which are two major regulators of plant growth and development.
我们检验了胞质游离钙浓度([Ca2+]cyt)的昼夜节律振荡能够编码信息这一假说。我们对拟南芥(Arabidopsis thaliana)子叶和叶片中[Ca2+]cyt的振荡进行了成像,这些振荡在光/暗周期以及持续光照下均具有24小时的周期。[Ca2+]cyt振荡的幅度、相位和形状以及关键日常时间点的[Ca2+]cyt受植物生长所处的光/暗条件控制。这些数据提供了证据,表明[Ca2+]cyt的24小时振荡编码了有关日长和光强的信息,而日长和光强是植物生长和发育的两个主要调节因子。