416 



George Hoch and Olga v. H, Owens 



of the two beams. At low rates of oxygen production chloro- 

 phyll a light causes a depressed oxygen uptake while at 

 these same values oxygen uptake is only slightly inhibited 

 in 630 light. Increasing the rate of O2 production in 

 accessory pigment illumination leads to an increased rate of 

 uptake above that occurring in the dark. 



Combining the 

 oxygen uptake wh 

 than in 63O mu 1 

 increases oxygen 

 take. If oxygen 

 in photosynthesi 

 tion which assis 

 the inhibition o 

 greater when far 

 added to dark, 

 fact that more u 

 dark. 



is less 



beams as shown on the third curve yields an 

 ich, relative to oxygen producti 

 ight alone. A combination of be 



production, therefore, reduces 



uptake can be considered a "los 



s, it is obviously the long wave 

 ts the short wave reaction. Not 

 f uptake caused by the far red b 



red is given to 63O light than 

 This is probably simply explaine 

 .r.take occurs in 63O light than o 



.on, 



ams which 

 oxygen up- 

 s" reaction 

 photoreac- 

 e also that 

 earn is 

 when it is 

 d by the 

 ::curs in the 



Figure 6 shows an enhancement experiment with Anacystis . 



RATE 

 O2 PROD 



RATE 

 O2 UPTAKE 







10 



20 



30 40 50 60 70 



RELATIVE INTENSITY, 710 m/x 



