SKOOG AND TSUI 



279 



TABLE 5 



Auxin content in tobacco stem segments cultured on media with adenine and 

 lAA. Expt. C. Cultures started 0, rS 48. Tissues extracted 2 hours with ether 



is absorbed and combines with phosphate in tlie tissues and that the 

 content of organic phosphate would be affected by the external supplies 

 both of L\-\ and adenine. Experiments by Holm (6) have established 

 that treatments with L\.\ tend to increase the total phosphate content 

 of the apical halves of the tobacco stem segments over that in controls, 

 but tend to decrease the phosphate content of the lower halves. Addition 

 of adenine, on the other hand, has relatively little effect on the phosphate 

 content in the apical halves but tends to increase the concentration in 

 the basal halves. Adenine supplied in combination with. LAA leads to 



T.\BLE 6 



Auxin content of horse radish root segments cultured on media with adenine 



and I.A\. Exp. 6^. Started 2. 24. 49: mitial pH 4.0, Phosphate 37.5 mg.< 1. 



Tissues extracted 2 hours with ether 



