PSI (Photosystem I)

PSI/PSII ratio can be estimated once a quantitative immunoblot for PsaC (AS10 939) and for either PsbA (AS05 084) or PsbD (AS06 146), is performed in 3-4 replicates. Ratio calculation is done on a sample by sample basis. These ratios are based on the subunits present, whether they are in the assembled photosystem or not. Under some circumstances (eg. high light), there are biological reasons that the subunit numbers do not necessarily match the functional photosystems.

Literature
Brown et al. (2008). Flux capacities and acclimation costs in Trichodesmium from the Gulf of Mexico. Marine Biology 154 (3): 413-422.
Levitan et al. (2010). Regulation of nitrogen metabolism in the marine diazotroph Trichodesmium IMS101 under varying temperatures and atmospheric CO2 concentrations. Environmental Microbiology 12(7): 1899-1912.
Thamatrakoln et al. (2013). A ‘Death-Specific Protein’ in a marine diatom regulates photosynthetic responses to iron and light availability. Proceedings of the National Academy of Science 110(50): 20123-20128 Li G,
Li et al. (2014). The Nitrogen Costs of Photosynthesis in a Diatom under Current and Future pCO2. New Phytologist, 205:533-543.


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