Hi, here i have enclosed a article for your concern related to photosystem II

The cascade of events in photosynthesis is made by several steps that involve perception and trasduction of light. The logic of searching a target starts from an altered response, in growth rate or chlorophyll content or mortality.. Should you be more clear about the case in question. 

Try to use pulse modulated chlorophyll fluorescence.

Yes Dr Duarte indicates  a valuable probe specific for PS2, In most cases there are symptoms that lead to targets that are far from PS2. Reaction centers (1 & 2+ Antennas and reductants) are sensible to metabolic feedbacks. You should clarify what happened (chilling, herbicide, nutrition, pH.....) and why you suppose a specific target

Thank you very much

Several of the plants that I grew on MS media with vitamins and nanoparticle became completely white or developed white leaves.

Then the damage is located upstream, say before PS and antennae are assembled, on chlorphyll biosynthesis. You should take your treatment in parts,by removing one by one and checking until greening comes back. The molecular reasons casn be viruses, pH, Iron or the interaction of nano with any of them

thank you very much

As far Chl biosynthesis some clue can be found in http://www.ncbi.nlm.nih.gov/pubmed/12175014 then you may check some specific RNA level.