Atanasov Vasil, Fürtauer Lisa, Nägele Thomas
LMU Munich, Plant Evolutionary Cell Biology, Großhaderner Str. 2-4, 82152 Planegg, Germany.
Plants (Basel). 2020 Jun 29;9(7):819. doi: 10.3390/plants9070819.
Diurnal and seasonal changes of abiotic environmental factors shape plant performance and distribution. Changes of growth temperature and light intensity may vary significantly on a diurnal, but also on a weekly or seasonal scale. Hence, acclimation to a changing temperature and light regime is essential for plant survival and propagation. In the present study, we analyzed photosynthetic CO assimilation and metabolic regulation of the central carbohydrate metabolism in two natural accessions of that originate from north western Russia and south Italy during exposure to heat and a combination of heat and high light. Our findings indicate that it is hardly possible to predict photosynthetic capacities under combined stress from single stress experiments. Further, capacities of hexose phosphorylation were found to be significantly lower in the Italian than in the Russian accession, which could explain an inverted sucrose-to-hexose ratio. Together with the finding of significantly stronger accumulation of anthocyanins under heat/high light, these observations indicate a central role of hexokinase activity in the stabilization of photosynthesis and carbohydrate metabolism during environmental changes.
非生物环境因素的昼夜和季节变化塑造了植物的性能和分布。生长温度和光照强度的变化在昼夜尺度上可能有显著差异，在每周或季节尺度上也是如此。因此，适应不断变化的温度和光照条件对于植物的生存和繁殖至关重要。在本研究中，我们分析了来自俄罗斯西北部和意大利南部的两个自然种源在受热以及热和高光组合胁迫时的光合CO2同化作用和中心碳水化合物代谢的代谢调节。我们的研究结果表明，很难从单一胁迫实验预测复合胁迫下的光合能力。此外，发现意大利种源的己糖磷酸化能力明显低于俄罗斯种源，这可以解释蔗糖与己糖比例的倒置。连同在热/高光条件下花青素积累明显更强的发现，这些观察结果表明己糖激酶活性在环境变化期间光合作用和碳水化合物代谢的稳定中起核心作用。
