Chen Chien-Teh, Setter Tim L
Department of Agronomy, National Chung Hsing University, Taichung 402, Taiwan.
Section of Soil and Crop Sciences, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853, USA.
Plants (Basel). 2021 Apr 26;10(5):871. doi: 10.3390/plants10050871.
Potato is adapted to cool environments, and there is concern that its performance may be diminished considerably due to global warming and more frequent episodes of heat stress. Our objectives were to determine the response of potato plants to elevated CO (700 μmol/mol) and high temperature (35/25 °C) at tuber initiation and tuber bulking, and to elucidate effects on sink developmental processes. Potato plants were grown in controlled environments with treatments at: Tuber initiation (TI), during the first two weeks after initiating short-day photoperiods, and Tuber bulking (TB). At TI, and 25 °C, elevated CO increased tuber growth rate, while leaves and stems were not affected. Whole-plant dry matter accumulation rate, was inhibited by high temperature about twice as much at TI than at TB. Elevated CO partially ameliorated high temperature inhibition of sink organs. At TI, with 25 °C, elevated CO primarily affected tuber cell proliferation. In contrast, tuber cell volume and endoreduplication were unaffected. These findings indicate that the TI stage and cell division is particularly responsive to elevated CO and high temperature stress, supporting the view that attention should be paid to the timing of high-temperature stress episodes with respect to this stage.
马铃薯适应凉爽环境，人们担心由于全球变暖以及热应激事件更加频繁，其生长表现可能会大幅下降。我们的目标是确定马铃薯植株在块茎形成期和块茎膨大期对升高的二氧化碳浓度（700 μmol/mol）和高温（35/25°C）的响应，并阐明对库发育过程的影响。马铃薯植株在可控环境中生长，处理时间为：块茎形成期（TI），即开始短日照光周期后的前两周，以及块茎膨大期（TB）。在TI阶段且温度为25°C时，升高的二氧化碳浓度增加了块茎生长速率，而叶片和茎不受影响。在TI阶段，高温对整株植物干物质积累速率的抑制作用约为TB阶段的两倍。升高的二氧化碳浓度部分缓解了高温对库器官的抑制。在TI阶段且温度为25°C时，升高的二氧化碳浓度主要影响块茎细胞增殖。相比之下，块茎细胞体积和核内复制不受影响。这些发现表明，TI阶段和细胞分裂对升高的二氧化碳浓度和高温胁迫特别敏感，支持了在该阶段应关注高温胁迫发生时间的观点。
