Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, UMR 759, INRA-SUPAGRO, F-34060 Montpellier, France.
Plant Cell Environ. 2011 Sep;34(9):1563-76. doi: 10.1111/j.1365-3040.2011.02353.x. Epub 2011 Jun 28.
High temperature (HT) is a major limiting factor for plant productivity. Because some responses to HT, notably hyponasty, resemble those encountered in low light (LL), we hypothesized that plant responses to HT are under the control of carbon balance. We analysed the interactive effects of HT and irradiance level on hyponasty and a set of traits related to plant growth in natural accessions of Arabidopsis thaliana and mutants affected in heat dissipation through transpiration (NCED6-OE, ost2) and starch metabolism (pgm). HT induced hyponasty, reduced plant growth and modified leaf structure. LL worsened the effects of HT, while increasing light restored trait values close to levels observed at control temperature. Leaf temperature per se did not play a major role in the observed responses. By contrast, a major role of carbon balance was supported by hyponastic growth of pgm, as well as morphological, physiological (photosynthesis, sugar and starch contents) and transcriptional data. Carbon balance could be a common sensor of HT and LL, leading to responses specific of the shade avoidance syndrome. Hyponasty and associated changes in plant traits could be key traits conditioning plant performance under competition for light, particularly in warm environments.
高温（HT）是植物生产力的主要限制因素。由于一些对 HT 的反应，特别是下弯，类似于在低光（LL）下遇到的反应，我们假设植物对 HT 的反应受碳平衡的控制。我们分析了 HT 和辐照度水平对下弯和一组与拟南芥天然品系和通过蒸腾耗散（NCED6-OE、ost2）和淀粉代谢（pgm）影响热耗散的突变体有关的生长特性的相互作用。HT 诱导下弯，降低植物生长并改变叶片结构。LL 恶化了 HT 的影响，而增加光照则使性状值恢复到对照温度下观察到的水平。叶片温度本身在观察到的反应中并没有起主要作用。相比之下，碳平衡的主要作用得到了 pgm 下弯生长的支持，以及形态、生理（光合作用、糖和淀粉含量）和转录数据的支持。碳平衡可能是 HT 和 LL 的共同传感器，导致对遮荫回避综合征的特异性反应。下弯和相关的植物性状变化可能是在光竞争下决定植物表现的关键性状，特别是在温暖的环境中。
