LHCB genes encode for the chlorophyll a/b binding proteins which form the apoprotein of PSII in the thylakoid membrane. LHCB genes are light-regulated (through phytochromes). Now if under low light stress, the expression of LHCB genes are downregulated, it is obvious that the PS II would be deficient in Chlorophyll a/b binding proteins. Also, it has been reported that the density of PSII under low light decreases, total chlorophyll concentration increases and chlorophyll a/b ratio decreases. Following the above points, we get a specific type of PSII under low light(ll PS-II) having more of pigments and less of apoproteins( chlorophyll a/b binding proteins).What is the impact of this low light formed PS II(ll PS-II), deficient in chl a/b binding proteins and rich in photosynthetic pigments, on the photochemistry and fluorescence under low light stress?
Every parameter in the environment of your system may influence more or less the behavior of the system. You have to be an expert to know already before what and how the changes will be. To come to that point you have to repeat the experiments or doing other experiments and read the findings of other colleagues. If you only trust your good guesses, you may be lucky and right, but mostly Nature goes other ways than what your predictions predict. That's why we still have to do experiments and accept situations where Nature does not follow our way of logic thinking. By accepting tha.t we are learning and proposing new questions.
Good luck
Reto J. Strasser strasserreto(at)bluewin.ch
Under low light if chlorophyll a/b ratio increase, can we tell this is good for photosynthesis or the cultivar is tolerant to low light stress?
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