Planta

, Volume 218, Issue 2, pp 315–322

Photon- and carbon-use efficiency in Ulva rigida at different CO2 and N levels

  • Francisco J. L. Gordillo
  • Félix L. Figueroa
  • F. Xavier Niell
Original Article

DOI: 10.1007/s00425-003-1087-3

Cite this article as:
Gordillo, F.J.L., Figueroa, F.L. & Niell, F.X. Planta (2003) 218: 315. doi:10.1007/s00425-003-1087-3
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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 (φPSII) and for oxygen evolution (φO2) 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 (φgrowth) 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.

Keywords

Ulva Absorptance Chlorophyll fluorescence Inorganic carbon Nitrogen limitation Quantum yield 

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

φgrowth

quantum yield for new biomass-C production

φO2

quantum yield for gross O2 evolution

φPSII

quantum yield for PSII charge separation

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Francisco J. L. Gordillo
    • 1
  • Félix L. Figueroa
    • 1
  • F. Xavier Niell
    • 1
  1. 1.Departamento de Ecología, Facultad de CienciasUniversidad de MálagaMálagaSpain

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