Membrane potential is involved in regulation of photosynthetic reactions in the marine diatom Thalassiosira weissflogii

Chlorophyll a fluorescence induction: a personal perspective of the thermal phase, the J–I–P rise

“…We conclude in this review that the mainstream concept, the theory of Duysens and Sweers in its modified version, is the most credible one, since many theoretical treatments and experimental results in the literature are in good agreement with it. However, we believe that some of the factors influencing the fluorescence yield that have been proposed in the alternative theories, as e.g., the membrane potential, can conceivably contribute to the modulation of the O-J-I-P transient in parallel with the reduction of Q A , through modifications at the PSII antenna and/or at the RC, or control of the redox status of the PQpool (see Antal et al 2011).…”

“…The membrane potential (DW) is expected to affect Chl a fluorescence for various reasons, including the Stark effect (Diner and Joliot 1976;Graan and Ort 1983;Bulychev et al 1986;Bulychev and Niyazova 1989;Zheng et al 1990;Dau andSauer 1991, 1992;Bulychev and Vredenberg 1999;Pospíšil and Dau 2002;Bulychev 2002, 2003;Belyaeva et al 2003;Rubin and Riznichenko 2009;Antal et al 2011) (see ''Understanding the thermal phase: an integrated view'' section). (13) Conformational changes influencing the fluorescence yield have been suggested to take place during the fast FI (Bradbury and Baker 1983;Moise and Moya 2004a, b;Schansker et al 2011).…”

“…In their picture, the influence of DW is important during the thermal phase, affecting the appearance and the position of the inflection I. Indeed, Antal et al (2011) have reported experimental data showing that in fast FI transients measured on the marine diatom Thalassiosira weissflogii the inflection point I is missing (or is significantly reduced), but it reappears after the membrane potential DW is eliminated by treatment with valinomycin. Antal et al (2011) concluded that the influence of membrane potential on light-induced fluorescence transients in T. weissflogii could involve changes in downregulation of PQ cycle, including proton transfer into the lumen, and/or also of charge separation/recombination reactions in PSII.…”

Effects of controlled oxidative stress and uncouplers on primary photosynthetic processes in vegetative cells of Antarctic alga Zygnema sp.

“…Dall´Osto et al 2005). In chlorophyll fluorescence studies, nigericin is reported having either no effect (isolated chloroplasts - Bukhov et al 2004) on fast chlorophyll fluorescence transients (OJIPs) or the effects causing an increase in chlorophyll fluorescence signal during O-J phase in diatoms (Antal et al 2011). In this study, signal coming prevalently from PS II antennae was reported nigericin-affected and causing partial inhibition of PS II.…”

Microalgae as versatile cellular factories for valued products

“…Bio-hydrogen is regarded as a sustainable energy carrier for fuel cells. Also in this case, solar energy is the fundamental driving force of the underlying processes [3,12,48]. Biotechnological production of H 2 is advantageous compared to the highly energy-demanding electrolysis of water.…”