supplemented with 20 mmol l-1 HEPES-NaOH (pH 7.5) upon illumination at 2,500 lux at 28 ± 1 °C.
maintaining pH by 10 mM HEPES (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) pH 7.5, and under the continuous white light of 50 μmol photons m-2s-1 and shaking at 130 round per min at 28 oC