PI (total) =(gamma/(1-gamma)(phi/(1-phi)(psi/(1-psi)(delta/(1-delta) where: gamma =Reaction center density in its antenna bed= RC/(Chl +RC)=Term for the structure = inverse of Antenna size AS.
Terms (probabilities p) for the functions. Used according to Nernst in the form of p/(1-p) = partial performance with the meaning of: Capability to do WORK or as the sum of the driving forces DF in the form of log(p/(1-p))
p standing for:
phi = kP/(kP+kN) = yield for primary Photochemistry of PS II = Fv/Fm
psi = (1-Vj) = yield for electron transport between PS II and PS I
delta = (1-Vi)/(1-Vj) = yield of Photosystem 1 for the reduction Flux RE of the End-.electron acceptor, who ever that may be.
Thank you very much! I do know it and I have a feeling that PI is more sensitive to various adverse effects, particularly in microalgae. We calculating it routinely in the course of our JIP measurements. I found it a bit strange that I always look at it but did not get around yet to include it in a publication...
Thank you very much for sharing useful information. I also gone through these equations in your papers. However, I have FluorPen Fp 100 for measurements from Photon System instruments, CZ. These formulas are not available in its software. I asked your one of students, for newer version of Biolyzer compatible with Fluorpen. He tried but he finally told me that he ran out funding for the development/updation. I may request for any MS Excel file for usage. Moreover, how can I use Excel to develop Leaf or membrane model (which is actually a feature of Biolyzer). In addition, if I have a complete data of transients, Can I transport/import it in previous version of Biolyzer/ any Hansatech software.
Here are the JIP equations. Please tell me if you did not get it properly.
Reto J. Strasser e-mail: [email protected]
Thanks for the information. While working on tolerance to submergence and salinity stress I find good correlation between PI and sensitivity of the plants. Fv/FM does not correlate at all.
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