40 



B 



45 



30 



1.5 



1.0 



- 0.5 



Fig. 3. 1 he course of uptake of 2,4-D and the gain in fresh weight by coleoptile 

 segments of (A) A. saliva and (B) T. viilgare, treated with concentrations of 0.5, 

 3, and 45 nig/1. 



HELIANTHUS 



50 



25 





 2 



Fig. 4. The course of uptake of 2,4-D and the gain in fresh weight by etiolated 

 stem segments of (A) G. hirsutum and (B) H. anninis, treated with concentrations 

 of 0.5, 3. and 45 mg/1. 



