, and removal of nutrients was poor. When the more robust SigB-oe strain was used for bioremediation of the greenhouse effluent, formation of an extra RNA polymerase holoenzyme containing the stress-responsive SigB sigma factor altered gene expression, allowing fast growth and nutrient removal. Heat-treated cyanobacterial biomass could sustain the growth of lettuce seedlings for 21 days in a dose-dependent manner. Success in the use of Synechocystis biomass as a fertilizer, points to potential of cyanobacteria in a bioremediation-biofertilization cycle, warranting further studies.
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Turunen et al. (2026) studied this question.
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