Cerri Neto B, Silva F R N, Ferreira T R, Crasque J, Arantes L O, Machado Filho J A, De Souza T C, Falqueto A R, Dousseau-Arantes S
Federal University of Espírito Santo, Avenida Fernando Ferrari 514, Goiabeiras, Vitória, Espírito Santo, Brazil.
Capixaba Institute for Research, Technical Assistance and Rural Extension, BR 101N, km 151, Linhares, PO Box 62, Espírito Santo, Brazil.
Photosynthetica. 2023 Sep 12;61(3):363-376. doi: 10.32615/ps.2023.030. eCollection 2023.
Studies that simulate recurrent drought events with subsequent episodes of rehydration better reflect natural conditions and allow visualization of differential acclimatization responses resulting from memory and tolerance mechanisms. and were grown in a greenhouse and were subjected to three successive cycles of drought and subsequent rehydration. After suspending irrigation, gas exchanges were measured daily with IRGA. When stomatal conductances close to zero were obtained, the plants were rehydrated and kept irrigated. In , stomatal conductance was always higher after periods of rehydration compared to the period before the drought, while the transpiration rate was lower only during the drought. The damage to the photosynthetic apparatus was caused by the influence of the interception of the flow of electrons in the transport chain. We came to the conclusion that the dehydrated plants showed an alert signal, which triggered response mechanisms to prevent or deal with the water stress situation.
通过随后的复水阶段来模拟反复干旱事件的研究，能更好地反映自然条件，并有助于观察由记忆和耐受机制产生的不同适应反应。[植物名称未给出]在温室中种植，并经历了三个连续的干旱及随后复水的循环。停止灌溉后，每天用红外气体分析仪测量气体交换。当气孔导度接近零时，对植物进行复水并持续灌溉。在[植物名称未给出]中，与干旱前的时期相比，复水后的气孔导度总是更高，而蒸腾速率仅在干旱期间较低。光合机构的损伤是由电子传递链中电子流的截留影响所导致的。我们得出的结论是，脱水植物显示出一种警报信号，该信号触发了预防或应对水分胁迫状况的反应机制。
