Fig. 6From: Fine-tuned regulation of photosynthetic performance via γ-aminobutyric acid (GABA) supply coupled with high initial cell density culture for economic starch production in microalgaeStarch accumulation as revealed by iodine staining in T. subcordiformis exposed to nitrogen deprivation under NICD and HICD conditions with GABA supply on Day 4. *, **, and *** denote the significant differences at p < 0.1, p < 0.05, and p < 0.01 levels, respectively, under different GABA conditions (2.5–10 mM) compared to those under 0 mM GABA (means ± SD, n = 3)Back to article page