Phototransformation of protochlorophyllide in etiolated leaves was shown to take place at 4.2 K. Upon illumination of the sample a photoactive form PChlide650 was transformed into a non-fluorescent intermediate which was then transformed into fluorescent forms of chlorophyllide (Chlide) upon increase of temperature in the dark. Reported transformations are similar to those observed under illumination at 77 K.
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