85 



Walter Bonner and Robert Hill 



Effect Of Light Intensity On Cytochrome f Oxidation 



2 4 6 8 



Relative Light Intensity 



10 



Fig. 3 The relation between extent of cytochrome Jf oxidation and 

 light intensity in partially greened mung bean leaves. 



Light induced cytochrome f^ oxidation was activated with 700-m^i 

 actinic light only; 640, 660, and 680 mp. were ineffective, 700 

 m^i actinic light did not cause noticable greening of the leaves, 

 a fact that clearly separates the events leading to the res- 

 ponse and the activation of the response, 



A spectrum of the 700 m^ light activated responses in part- 

 ially greened mung bean leaves is shown in Figure 4, a spectrum 

 that corresponds remarkably well to that of cytochrome f^. 



Light induced Rttpontn 

 Partially Gratned Mung B«an 

 Leaves 



T 



A0.D.»0.005 



S._^ 



I 1 — 



SOO 510 



— I — 

 520 



530 540 550 560 570 580 m^ 

 Woveiength 



Fig, 4 The light 

 activated optical res- 

 ponses of partially 

 greened mung bean leave 

 plotted as a function of 

 wave length. 



