COMPOUND 



BIOLOGICAL ASSAY 



HO 



BEAN EPICOTYL TOMATO OVARY 

 5\^ ELONGATION GROWTH 



6 



Active 



Active 



CH, ^ COOH " 



Sligtitly 

 Active 



Slightly 

 Active 



Not 

 Active 



H 



CH, 



Sligtitly 

 Active 



Slightly 

 Active 



Not 

 Active 



0=1 



Not 

 Active 



Fig. 6. Relative aclivily of gibberellin A^ derivatives in elongation of tlic bean 

 epicotyl and growth of tomato ovaries. 



