Groupe de Recherche en Physiologie végétale, Earth and Life Institute - Agronomy (ELI-A), Université catholique de Louvain, 5 (Bte L7.07.13) Place Croix du Sud, Louvain-la-Neuve, 1348, Belgium.
Laboratory of Growth Regulators, Palacky University & Institute of Experimental Botany AS CR, Šlechtitelů 27, CZ-783 71 Olomouc, Czech Republic.
J Plant Physiol. 2020 Aug;251:153222. doi: 10.1016/j.jplph.2020.153222. Epub 2020 Jul 1.
In the context of ongoing climate change, expected temperature rise may significantly limit plant growth and productivity of crop species. In this study, we investigated the effects of a sub-optimal temperature on buckwheat, a pseudocereal known for its nutraceutical advantages. Two buckwheat species differing by their reproduction method, namely Fagopyrum esculentum and Fagopyrum tataricum were grown at 21 °C and 27 °C in growth chambers. High temperature increased leaf production mainly in F. tataricum but decreased leaf area in both species. Water and photosynthesis-related parameters were affected by high temperature but our results suggested that although transpiration rate was increased, adaptive mechanisms were developed to limit the negative impact on photosynthesis. High temperature mainly affected the reproductive stage. It delayed flowering time but boosted inflorescence and flower production. Nevertheless, flower and seed abortions were observed in both species at 27 °C. Regarding flower fertility, heat affected more the female stage than the male stage and reduced the stigma receptivity. Pollen production increased with temperature in F. esculentum while it decreased in F. tataricum. Such discrepancy could be related to the self-incompatibility of F. esculentum. Both species increased their antioxidant production under high temperature to limit oxidative stress and antioxidant capacity was higher in the inflorescences than in the leaves. Total flavonoid content was particularly increased in the leaves of F. esculentum and in the inflorescences of F. tataricum. Altogether, our results showed that even if high temperature may negatively affect reproduction in buckwheat, it improves its antioxidant content.
在持续的气候变化背景下，预计气温上升将极大地限制作物物种的生长和生产力。在这项研究中，我们研究了亚最佳温度对荞麦的影响，荞麦是一种以其营养优势而闻名的伪谷物。两种荞麦物种，其繁殖方式不同，即甜荞（Fagopyrum esculentum）和鞑靼荞麦（Fagopyrum tataricum），在生长室中分别在 21°C 和 27°C 下生长。高温主要增加了 F. tataricum 的叶片产量，但降低了两种物种的叶面积。高温影响了水分和光合作用相关参数，但我们的结果表明，尽管蒸腾速率增加，但适应性机制的发展限制了对光合作用的负面影响。高温主要影响生殖阶段。它延迟了开花时间，但促进了花序和花的产生。然而，在 27°C 下，两种物种都观察到了花和种子的败育。关于花的育性，高温对雌性阶段的影响大于雄性阶段，降低了柱头的接受性。在 F. esculentum 中，花粉产量随温度升高而增加，而在 F. tataricum 中则减少。这种差异可能与 F. esculentum 的自交不亲和性有关。两种物种在高温下增加了抗氧化剂的产生，以限制氧化应激，并且在花序中的抗氧化能力高于叶片。在 F. esculentum 的叶片和 F. tataricum 的花序中，总类黄酮含量特别增加。总的来说，我们的结果表明，即使高温可能对荞麦的繁殖产生负面影响，但它提高了其抗氧化剂含量。
