o 

 cr 

 o 



AGE, LENGTH 



Fig. 2. Auxin content and growth (control, with lAA and light) of Lens roots in 

 relation to their age (length). 



o 8 

 a. 



d 



o 



Q 

 UJ 



>- 

 O 

 cc 



t/) 



ui 2 

 o 



< 



a. 



YOUNG CELLS 



OLD CELLS 



10 



20 30 



LENGTH IN MM. 



40 



50 



Fig. 3. lAA destruction for the two types of fragments (root tip: nlil cells as 

 filled circles; merislem: young cells as open circles) of roots from dilicrciil lengths. 



