neda Fakhimi - school of Chemical Engineering, College of Engineering, University of Tehran,p.o.box ۱۱۱۵۵-۴۵۶۳,tehran ,iran
Omid Tavakoli - school of Chemical Engineering, College of Engineering, University of Tehran,p.o.box ۱۱۱۵۵-۴۵۶۳,tehran ,iran
seyed-amir marashi - Department of Biotechnology, University College of Science, University of Tehran, Tehran, Iran
david gonzalez ballester - Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias, Universidad de Córdoba, Campus de Rabanales, Edif. Severo Ochoa, ۱۴۰۷۱ Córdoba, Spain

Nowadays, hydrogen fuel is mainly derived from fossil fuels. High energy consumption and CO2 emission has encouraged human to search for sustainable and clean technologies to produce hydrogen. Hydrogen production by microalgae is a promising alternative in this regard. Among various photosynthetic microalgae able to produce hydrogen, Chlamydomonas reinhardtii is a model organism widely used to study hydrogen production. Low yield of hydrogen production in these systems has limited the industrial application of these technologies. In this study co-culture of Rhizobium with C. reinhardtii could improve hydrogen production 4 times.