688 



LIGHT ABSORPTION BY PIGMENTS IN VIVO 



CHAP. 22 



en 



en 



ir 



350 



400 



450 



650 



700 



750 



500 550 600 



WAVE LENGTH, m/x 



Fig. 22.14. Transmission (T/I) of dark-green, light-green and yellow leaves of 

 Hibiscus rosa-sinensis, and of equivalent quantities of pigments in ether (after Loomis, 

 Carr and Randall 1941). With allowance for reflection, the leaves absorbed more 

 light than the extracted pigments in the green part of the spectrum, and less in the blue 

 and red. 



00084 mg /ml 



Clioroplast 



suspension 



(Spinach) 



400 



800 



500 600 700 800 400 500 600 700 



WAVE LENGTH, m/i WAVE LENGTH, m^ 



Fig. 22.15. Absorption and reflection spectra of leaves (G, H), of chloroplast suspen- 

 sions (I, K) and of the supernatant fraction after centrifugation of disintegrated chloro- 

 plasts (J, L) (as measured with the Ulbricht sphere) (after Rabideau, French and Holt 

 1946). The chlorophyll concentrations of the suspensions are given on figures. 



