Photon- and carbon-use efficiency in Ulva rigida at different CO2 and N levels |
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| Authors: | Francisco?J.?L.?Gordillo author-information" > author-information__contact u-icon-before" > mailto:gordillo@uma.es" title=" gordillo@uma.es" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Félix?L.?Figueroa,F.?Xavier?Niell |
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| Affiliation: | (1) Departamento de Ecología, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain |
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| Abstract: | The seaweed Ulva rigida C. Agardh (Chlorophyta) was cultured under two CO2 conditions supplied through the air bubbling system: non-manipulated air and 1% CO2-enriched aeration. These were also combined with N sufficiency and N limitation, using nitrate as the only N source. High CO2 in U. rigida led to higher growth rates without increasing the C fixed through photosynthesis under N sufficiency. Quantum yields for charge separation at photosystem II (PSII) reaction centres ( PSII) and for oxygen evolution (O2) decreased at high CO2 even in N-sufficient thalli. Cyclic electron flow around PSII as part of a photoprotection strategy accompanied by decreased antennae size was suspected. The new re-arrangement of the photosynthetic energy at high CO2 included reduced investment in processes other than C fixation, as well as in carbon diverted to respiration. As a result, quantum yield for new biomass-C production (growth) increased. The calculation of the individual quantum yields for the different processes involved allowed the completion of the energy flow scheme through the cell from incident light to biomass production for each of the CO2 and N-supply conditions studied.Abbreviations A total thallus absorptance - Apig absorptance due to pigments - Astr Absorptance due to non-pigmented structures - a* spectrally averaged in vivo absorption cross-section of chlorophyll a - CCM carbon-concentrating mechanism - Chl chlorophyll - DOC dissolved organic carbon - ETR electron transport rate - Fv/Fm optimum quantum yield for PSII charge separation - GP gross O2 evolution rate - kpig specific light absorption coefficient for pigments - kstr specific light absorption coefficient for non-pigmented structures - OP optimum O2 evolution rate - PFR photon fluence rate - POC particulate organic carbon - PS photosystem - qN non-photochemical quenching - qP photochemical quenching - growth quantum yield for new biomass-C production - O2 quantum yield for gross O2 evolution - PSII quantum yield for PSII charge separation |
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| Keywords: | Ulva Absorptance Chlorophyll fluorescence Inorganic carbon Nitrogen limitation Quantum yield |
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