176 



PLANT GROWTH SUBSTANCES 



The formative influence is not apparent on parts of the plant present 

 at the time the chemical is applied. Only those parts which grow after 

 the plant is treated show formative effects. Old leaves, for example, 

 cannot be reshaped (Fig. i). 



TABLE 1 

 Molecular configuration and comparative activity for cell elongation involving 



the tomato plant as test object 



CHXOOH 



NO, 



^^ 



Inactive 



CHXOOH 



Active 



CH.COOH 



Inactive 



CKCOOH 



NH, 



^\^ 



Inactive 



CH^COOH 



^^ 



NH, 



Inactive 



CKCOOH 



Active 



CHXOOH 

 I ^ 



V^ 



CHXOOH 



^^^ 



CHXOOH 



Active 



Active 



Active 



^Inactive for formative effects. 



