Climate change would increase frequency and intensity of extreme events as heat and cold waves. There is a lack of studies that consider the co-occurrence of these waves with other abiotic factors relevant on a climate change scenario as salinity. Therefore, it could be interesting to improve our knowledge about the effects that this co-occurrence could have in different species due to the species specific effect of the photosynthesis tolerance to extreme temperatures. A controlled condition experiment was performed using the salt marsh species Sarcocornia perrnis with eight experimental blocks combining temperature ranges (40-28/22-15/13-5 °C) and salinity concentration on the growth solution (171/1050 mM NaCl). After 3 days of treatment, gas exchange, chlorophyll a fluorescence, pigment profile and water state measurement were applied. Photosynthetic machinery function of this perennial species decreased on for both high and low temperature range. Nevertheless, at 13-5 °C the effect of the salinity was mainly due to diffusion limitations more than to damage on the photosystems. At 40-28 °C, in presence of optimal salinity S. fruticosa was not altered overall. However, high temperatures in combination with high salinity reduced the photosynthetic capacity mainly by reducing the efficiency of the electron transport chain.

中文翻译：

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金合子藻对短期极端温度事件的光合作用以及最佳和次佳盐度浓度的响应。

气候变化将增加极端事件作为热浪和冷浪的频率和强度。缺乏研究将这些波浪与与气候变化情景相关的其他非生物因素的共同存在视为盐度。因此，有趣的是，由于光合作用对极端温度的耐受性对物种的特定影响，我们对这种共现可能在不同物种中产生的影响的认识有所提高。使用盐沼物种Sarcocornia perrnis和八个实验块进行了控制条件实验，这些实验块结合了温度范围（40-28 / 22-15 / 13-5°C）和生长溶液上的盐度浓度（171/1050 mM NaCl）。处理3天后，进行气体交换，叶绿素a荧光，色素分布和水状态测量。在高温和低温范围内，该多年生物种的光合机械功能均下降。然而，在13-5°C下，盐度的影响主要是由于扩散限制而不是对光系统的损害。在40-28°C下，在最佳盐度条件下，金黄色葡萄球菌总体上没有改变。然而，高温与高盐度的结合主要通过降低电子传输链的效率而降低了光合能力。