
TY  - JOUR
A1  - Quigg, Antonietta 
A1  - Beardall, John 
A1  - Wydrzynski, Tom 
T1  - Photoacclimation involves modulation of the photosynthetic oxygen-evolving reactions in <emph type="2">Dunaliella</emph> <emph type="2">tertiolecta</emph> and <emph type="2">Phaeodactylum</emph> <emph type="2">tricornutum</emph>
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 2003
VL  - 30
IS  - 3
SP  - 301
EP  - 308
KW  - backward transitions, Dunaliella tertiolecta, eigenvalue model, Kok parameters, microalgae, oxygen evolution, Phaeodactylum tricornutum, photosystem II, phytoplankton.
UR  - https://doi.org/10.1071/FP02140 
N2  - Net energy accumulation by marine microalgae at very low photon fluxes involves modulation of several attributes related to both the growth and photosynthetic physiology of these organisms. Here we studied flash-induced oscillatory patterns in oxygen evolution by previously dark-adapted cells of the green alga Dunaliella tertiolecta (Butcher) and the diatom Phaeodactylum tricornutum (Bohlin). The activity of the oxygen-evolving complex was found to be species-specific and influenced by photoacclimation. Results from measurements of oxygen flash yield obtained for these organisms grown under light-saturating conditions are directly comparable to those previously reported in the literature for other microalgae and higher plants. However, similar measurements on cells grown in low-light and/or light-starved conditions indicate an increased level of backward transitions (double misses) leading to the formation of super-reduced states (i.e. S&#8211;1 and S&#8211;2). Thus, in this communication, we present the first evidence that super-reduced states can be generated in vivo and speculate, on how they may be physiologically important. 
ER  -

