Stewart Jared J, Demmig-Adams Barbara, Cohu Christopher M, Wenzl Coleman A, Muller Onno, Adams William W
Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, 80309-0334, USA.
Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany.
Plant Cell Environ. 2016 Jul;39(7):1549-58. doi: 10.1111/pce.12720. Epub 2016 Apr 6.
The plasticity of leaf form and function in European lines of Arabidopsis thaliana was evaluated in ecotypes from Sweden and Italy grown under contrasting (cool versus hot) temperature regimes. Although both ecotypes exhibited acclimatory adjustments, the Swedish ecotype exhibited more pronounced responses to the two contrasting temperature regimes in several characterized features. These responses included thicker leaves with higher capacities for photosynthesis, likely facilitated by a greater number of phloem cells per minor vein for the active loading and export of sugars, when grown under cool temperature as opposed to leaves with a higher vein density and a greater number of tracheary elements per minor vein, likely facilitating higher rates of transpirational water loss (and thus evaporative cooling), when grown under hot temperature with high water availability. In addition, only the Swedish ecotype exhibited reduced rosette growth and greater levels of foliar tocopherols under the hot growth temperature. These responses, and the greater responsiveness of the Swedish ecotype compared with the Italian ecotype, are discussed in the context of redox signalling networks and transcription factors, and the greater range of environmental conditions experienced by the Swedish versus the Italian ecotype during the growing season in their native habitats.
在拟南芥欧洲品系中，对来自瑞典和意大利的生态型植株进行叶形态和功能可塑性的评估，这些植株在对比鲜明（凉爽与炎热）的温度条件下生长。尽管两种生态型都表现出适应性调节，但瑞典生态型在几个特征方面对两种不同温度条件表现出更明显的响应。这些响应包括叶片更厚，光合作用能力更强，在凉爽温度下生长时，每条小叶脉中韧皮部细胞数量更多，这可能有助于糖分的主动装载和输出；而在炎热温度且水分充足的条件下生长时，叶片的叶脉密度更高，每条小叶脉中管状分子数量更多，这可能有助于提高蒸腾失水速率（从而实现蒸发冷却）。此外，只有瑞典生态型在炎热生长温度下莲座叶生长减缓，叶片生育酚水平更高。本文在氧化还原信号网络和转录因子的背景下，以及瑞典生态型与意大利生态型在其原生栖息地生长季节所经历的更广泛环境条件的背景下，讨论了这些响应以及瑞典生态型与意大利生态型相比更强的响应能力。
