T. C. Br oyer 219 



suggesting the utilization of sugars primarily in these regards. Further- 

 more, subsequent to depletion of sugars, respiration in roots (measured 

 by the carbon dioxide evolved) may proceed without marked reduction 

 in rate, although the respiratory quotient undoubtedly changes (Figure 



TABLE V 



Effects of Sugar Supplied to Culture Medium on Accumulation of Potassium 



and Nitrate 



Concentration of K in Sap, Experiment B 

 (Initial cone, of K in sap approx. 25) 



m.e./l. 



1. 93.6 



2. 63.0 



3. 89.6 



18). However, concomitant inorganic solute accumulation appears to 

 be greatly reduced (jo), indicating that other substrates are probably 

 less effective, indirectly, for this process. Similar results have been re- 

 ported elsewhere (42, 4]). 



