A. ir. GALSrON AND RAVIN DAR KAUR 



im) 



DARK 



-log M CMU 

 Fig. 10. Effect of p-chlorophenyl dimethyl urea (CMU) on the growth of green 

 pea stem sections in light and dark, 



substances are effective in inhibiting the autotrophic growth of green 

 sections in the light, but are essentially without effect on heterotrophic 

 growth of green sections supplied with sucrose in the dark. Figs. 12 

 and 13 show that the inhibitions imposed by these substances in the 



30r 



E 

 E 



< 1.0 



Light 



-log M Fenuron 



Fig. 11. Effect of fenuron (phenyl dimethyl urea) on the growth of green 

 pea stem sections in light and dark. 



