Pulsed light illumination stands out as a noteworthy technique for photosynthetic H production, playing a crucial role in eliminating O and activating hydrogenase enzymes. However, further improvements are essential to make H photoproduction suitable for future commercial applications. In our study, we observed a distinct enhancement in pulsed light-induced H photoproduction in the unicellular green alga Chlamydomonas reinhardtii when treated with the optimal concentration of the mild O scavenger NaSO. This improvement was a result of reduced O content, increased hydrogenase enzyme activity, and suppressed H-uptake activity. Furthermore, our findings indicate that exposing NaSO-treated C. reinhardtii to optimal light waveform continues to significantly boost pulsed light-induced H photoproduction, attributed to the alleviation of impaired photosystem II activity. Altogether, the combined application of optimal sulfite concentration and light waveform effectively enhances pulsed light-induced photosynthetic H production in the green alga C. reinhardtii.
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