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Background  A recent Commentary article entitled “On the pathways feeding the H 2  production process in nutrient-replete, hypoxic conditions” by Dr. Scoma and Dr. Tóth, Biotechnology for Biofuels (2017), opened a very interesting debate about the H 2  production photosynthetic-linked pathways occurring in Chlamydomonas cultures grown in acetate-containing media and incubated under hypoxia/anoxia conditions. This Commentary article mainly focused on the results of our previous article “Low oxygen levels contribute to improve photohydrogen production in mixotrophic non-stressed Chlamydomonas cultures,” by Jurado-Oller et al., Biotechnology for Biofuels (7, 2015; 8:149).    Main body  Here, we review some previous knowledge about the H 2  production pathways linked to photosynthesis in Chlamydomonas, especially focusing on the role of the PSII-dependent and -independent pathways in acetate-containing nutrient-replete cultures. The potential contributions of these pathways to H 2  production under anoxia/hypoxia are discussed.    Conclusion  Despite the fact that the PSII inhibitor DCMU is broadly used to discern between the two different photosynthetic pathways operating under H 2  production conditions, its use may lead to distinctive conclusions depending on the growth conditions. The different potential sources of reductive power needed for the PSII-independent H 2  production in mixotrophic nutrient-replete cultures are a matter of debate and conclusive evidences are still missing.

biotechnology for biofuels

H2 production pathways in nutrient-replete mixotrophic Chlamydomonas cultures under low light. Response to the commentary article “On the pathways feeding the H2 production process in nutrient-replete, hypoxic conditions,” by Alberto Scoma and Szilvia Z. Tóth