Figure 4.

The 77 K chlorophyll a fluorescence emission measurements. The fluorescence emission signals were normalized to the PSII emission maximum at 685-nm wavelength. The PSI emission signal peaks at 733 nm in the wild type (WT). The blue-shifted wavelength of the PSI emission maximum in the Δycf4 knockout mutants and the KD-psaA control plants indicates that PSI antenna organization is altered and suggests that a significant proportion of PSI antenna proteins are not attached to PSI core complexes.