FIGURE 1.

Orthogonal effect curves of NAA, antioxidants, and light intensity on growth (OD₇₅₀), photosynthetic efficiency (YII), and lipid accumulation of Mychonastes afer. NAA (A), antioxidant (B), light intensity (C) and the interactions between the light intensity and antioxidants (B × C) were the factors investigated here with four levels, and NULL is for the error assessment. The four levels of these factors were as follows: 0 mg/L (A₁), 0.5 mg/L (A₂), 1.5 mg/L (A₃), and 5 mg/L (A₄) for NAA dosage, 0 mg/L (B₁), 0.5 mg/L EGCG (B₂), 2 mg/L TP (B₃), and 20 mg/L TP (B₄) for antioxidants dosage. And 120 μmol photons m^-2⋅s^-1 of light intensity was used as low-light level (LL, C₁/C₂), 400 μmol photons m^-2⋅s^-1 was used as high-light level (HL, C₃/C₄).