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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.

Duarte B, Santos D, Silva H, Marques JC, Caçador I, Sleimi N - AoB Plants (2014)

Bottom Line: Waterlogging and submergence are the major constraints to which wetland plants are subjected, with inevitable impacts on their physiology and productivity.In the present work, the underwater O2 fluxes in the leaves of two abundant Mediterranean halophytes were evaluated at different levels of dissolved CO2.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.

View Article: PubMed Central - PubMed

Affiliation: Centre of Oceanography of the Faculty of Sciences, University of Lisbon (CO), Campo Grande, 1749-016 Lisbon, Portugal MARE-Marine and Environmental Sciences Centre, Faculty of Sciences, University of Lisbon, Campo Grande 1749-016 Lisbon, Portugal baduarte@fc.ul.pt.

No MeSH data available.


Related in: MedlinePlus

Photosystem II variable fluorescence and quantum efficiencies (operational and maximum) by the two tested species under light and dark conditions, at different levels of dissolved CO2 (average ± standard deviation, n = 9. Letters indicate significant differences among CO2 treatments at P < 0.05).
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PLU067F2: Photosystem II variable fluorescence and quantum efficiencies (operational and maximum) by the two tested species under light and dark conditions, at different levels of dissolved CO2 (average ± standard deviation, n = 9. Letters indicate significant differences among CO2 treatments at P < 0.05).

Mentions: The maximum PSII quantum efficiencies (dark-adapted leaves) showed no evident differences among the dissolved CO2 treatments for either species tested (Fig. 2). As for the operational PSII quantum efficiencies, there was a tendency for reduction with increasing dissolved CO2 concentrations. The variable fluorescence (Fv) in both dark- and light-adapted leaves of H. portulacoides showed a decrease in both with increasing CO2 treatments, presenting a maximum at 0.5 mM dissolved CO2. On the other hand, in S. maritima the Fv in dark-adapted leaves showed an evident increase along with increasing dissolved CO2 concentrations. Nevertheless, there was no distinguishing pattern in the variable fluorescence data in light-adapted leaves of S. maritima.Figure 2.


Light-dark O2 dynamics in submerged leaves of C3 and C4 halophytes under increased dissolved CO2: clues for saltmarsh response to climate change.

Duarte B, Santos D, Silva H, Marques JC, Caçador I, Sleimi N - AoB Plants (2014)

Photosystem II variable fluorescence and quantum efficiencies (operational and maximum) by the two tested species under light and dark conditions, at different levels of dissolved CO2 (average ± standard deviation, n = 9. Letters indicate significant differences among CO2 treatments at P < 0.05).
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4260444&req=5

PLU067F2: Photosystem II variable fluorescence and quantum efficiencies (operational and maximum) by the two tested species under light and dark conditions, at different levels of dissolved CO2 (average ± standard deviation, n = 9. Letters indicate significant differences among CO2 treatments at P < 0.05).
Mentions: The maximum PSII quantum efficiencies (dark-adapted leaves) showed no evident differences among the dissolved CO2 treatments for either species tested (Fig. 2). As for the operational PSII quantum efficiencies, there was a tendency for reduction with increasing dissolved CO2 concentrations. The variable fluorescence (Fv) in both dark- and light-adapted leaves of H. portulacoides showed a decrease in both with increasing CO2 treatments, presenting a maximum at 0.5 mM dissolved CO2. On the other hand, in S. maritima the Fv in dark-adapted leaves showed an evident increase along with increasing dissolved CO2 concentrations. Nevertheless, there was no distinguishing pattern in the variable fluorescence data in light-adapted leaves of S. maritima.Figure 2.

Bottom Line: Waterlogging and submergence are the major constraints to which wetland plants are subjected, with inevitable impacts on their physiology and productivity.In the present work, the underwater O2 fluxes in the leaves of two abundant Mediterranean halophytes were evaluated at different levels of dissolved CO2.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.

View Article: PubMed Central - PubMed

Affiliation: Centre of Oceanography of the Faculty of Sciences, University of Lisbon (CO), Campo Grande, 1749-016 Lisbon, Portugal MARE-Marine and Environmental Sciences Centre, Faculty of Sciences, University of Lisbon, Campo Grande 1749-016 Lisbon, Portugal baduarte@fc.ul.pt.

No MeSH data available.


Related in: MedlinePlus