Figure 6

Comparison of the expression of photosynthetic genes in S. calendulacea (NC1–NC3) and S. trilobata (IC1–IC3) (A). Relative expression of the photosynthetic pathway, photosystem II D1 protein gene (PsbA) (B), Rubisco large subunit gene (RubiscoL) (C) and oxygen-evolving complex gene (OEC) (D) in the two species (n = 6). The glyceraldehyde 3-phosphate dehydrogenase (GAPDH) gene was used for normalization. The error bars represent the standard deviations (SDs), and the asterisks indicate significant differences according to two-sided Student’s t-test (*P < 0.05, **P < 0.01).