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首页> 美国卫生研究院文献>AoB Plants >Light–dark O2 dynamics in submerged leaves of C3 and C4 halophytes under increased dissolved CO2: clues for saltmarsh response to climate change
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Light–dark O2 dynamics in submerged leaves of C3 and C4 halophytes under increased dissolved CO2: clues for saltmarsh response to climate change

机译：溶解CO2增加下C3和C4盐生植物淹没叶片的明暗O2动态：盐沼对气候变化响应的线索

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Waterlogging and submergence are the major constraints to which wetland plants are subjected, with inevitable impacts on their physiology and productivity. Global warming and climate change, as driving forces of sea level rise, tend to increase such submersion periods and also modify the carbonate chemistry of the water column due to the increased concentration of CO2 in the atmosphere. In the present work, the underwater O2 fluxes in the leaves of two abundant Mediterranean halophytes were evaluated at different levels of dissolved CO2. Photosynthetic enhancement due to increased dissolved CO2 was confirmed for both Halimione portulacoides and Spartina maritima, probably due to high tissue porosity, formation of leaf gas films and reduction of the oxygenase activity of Rubisco. Enhancement of the photosynthetic rates in H. portulacoides and S. maritima was concomitant with an increase in energy trapping and transfer, mostly due to enhancement of the carboxylation reaction of Rubisco, leading to a reduction of the energy costs for carbon fixation. Transposing these findings to the ecosystem, and assuming increased dissolved CO2 concentration scenarios, the halophyte community displays a new ecosystem function, increasing the water column oxygenation and thus reinforcing their role as principal primary producers of the estuarine system.
机译：涝灾和淹没是湿地植物遭受的主要限制，对其生理和生产力产生不可避免的影响。随着海平面上升的驱动力，全球变暖和气候变化趋向于增加这种淹没期，并且由于大气中二氧化碳浓度的增加，也改变了水柱的碳酸盐化学性质。在目前的工作中，以不同的溶解二氧化碳水平评估了两种丰富的地中海盐生植物叶片中的水下氧气通量。确认了由于哈米醌马齿and和海草斯巴达通都增加了溶解的CO2，从而提高了光合作用，这可能是由于组织孔隙率高，叶片气膜形成以及Rubisco的加氧酶活性降低所致。 Portulacoides和S. maritima中光合速率的提高与能量捕获和转移的增加同时发生，这主要是由于Rubisco羧化反应的增强，从而降低了碳固定的能源成本。将这些发现转化为生态系统，并假设增加溶解的CO2浓度的情景下，盐生植物群落显示出新的生态系统功能，增加了水柱的氧合作用，从而增强了它们作为河口系统主要主要生产者的作用。

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