Fig. 2From: Application of an in situ CO2–bicarbonate system under nitrogen depletion to improve photosynthetic biomass and starch production and regulate amylose accumulation in a marine green microalga Tetraselmis subcordiformisPhotosynthetic activity (\(F_{\text{v}} /F_{\text{m}}\), a), dissipated energy flux per excited cross section (DIo/CS0, b) and carotenoid/chlorophyll ratio (Car/Chl, c) of T. subcordiformis cultures with different amounts of NaHCO3 addition (0, 0.2, 1 and 5 g L−1) under nitrogen depletion (mean ± SD, n = 3)Back to article page