As chlorophyll is fluorescent, you can see that the chloroplasts are red in fluorescence microscopy and green in brightfield microscopy.
When exposed by light of around 400-700 nm (photosynthetically active radiation, or PAR), photosynthetic tissues and organisms emit red to far-red light, which is known as fluorescence (McCree 1972). In this spectrum, red and blue light are more effective at stimulating chlorophyll than green light.
Chlorophyll fluorescence is a frequent method in plant physiology for measuring photosystem II (PSII) activity since it is non-invasive. One of the most effective and popular methods for examining how pressures affect the photosynthetic process is chlorophyll fluorescence analysis.
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