1762 



CHEMISTEY OF CHLOROPLAST PIGMENTS 



CHAP. 37b 



chlorophyll lost, so that the total pigment concentration drops very 

 slightly. After about one hour of illumination, chlorophyll b appears, and 



< 



5£ 0.0004 



6 8 10 12 



EXPOSURE TIME, min. 



Fig. 37B.1. Quantity of chlorophyll formed (O) and of protochlorophyll used 

 up (•) in etiolated corn seedlings (after Koski 1950). 



_ 2 3 4 



^ EXPOSURE TIME, hr. 



Fig. 37B.2. Formation of chlorophyll a (O) and b (•) at 12° C. in 

 etiolated corn seedlings (after Koski 1950). Original protochlorophyll 

 content of the seedings was 0.003 mg./g. fresh weight. 



