Cotyledons of Norway spruce develop latent photosystem II in the dark.
The photosystem II is not able to form large PSII-supercomplexes.
The photosystem II is rapidly photoactivated, including the ligation of Mn atoms.
The formation of PSII-supercomplexes is delayed.
A regulatory role of PsbP and PsbQ proteins in PSII-supercomplex formation is suggested.