Natural auxins 



^2C- 



♦ 13- 



% 



(a) xhoPropancI/ ammonia 





12 



10 



(t) 



'^-Bufanol/ammon/a 



lAA 



IAN 



Response to I AA 

 ■rag/l.) 



0-^ O-t OS 0-8 



1-0 Response toIAA 



J I L 



_L 



J I I L 



0-2 04 0-6 0-8 1-0 



^ 20 



78 





I 



76 



7V- 



u; 72 



70 



(c) 



mPropanol/ammonia 

 lAA 



IAN 



Response foIAA 

 (mg/U 



J I 1 L 



J I I I L 



n, -Bufanol/ammonia 



lAA 



IAN 



0-2 OV 0-6 



0-8 1-0 Response to I AA 

 ^ _l(mg/L.) 



J I I I 



J 1 1 L_L 



0-2 OV- OS OS 



7-0 



% 



^ 76 



7¥ 





12 



10 



(f) 



u -Butanol/ammonio 



lAA 



IAN 



Response to lAA o 



(lag/l) 



0-2 



04 0-6 0-8 



IS Response toIAA o 

 A. — * (lag/l.) 



_L 



J L 



X 



0-2 04 OS OS 70 



Figure 2. Chromatography of the aqueous fraction of an extract of cabbage leaves, (a), (b) Chromato- 

 graphy was first carried out in ammoniacal isopropanol. The u. v. -fluorescent zones corresponding to 1 

 and 2 in Figure 1 (a) were eluted with water and rechromatographed in ammoniacal isopropanol (a) and 

 n-butanol {b). {c)-{f) Chromatography was first carried out in ammoniacal n-butanol. The starting 

 line was eluted in water and rechromatographed in ammoniacal isopropanol (c) and n-butanol (d). 

 Following this zone, u.v. -fluorescent zones corresponding to 2 and 3 in Figure l{b) were treated in a 

 similar manner {{e) and (f) respectively). 



44 



