64 



D. G. Crosby and A. J. Vlitos 



lated from plant extracts. Since it has not been possible to demon- 

 strate the presence of either of the two principal known indolic 

 auxins, this tobacco variety may present one example of a hormone 

 system in which indoles are not involved, or in which at least they 

 do not play a major role. 



Other examples have been found in rapidly growing species of 

 bamboo. Figure 6 presents a hormone profile of Bambusa multiplex 

 obtained in the same w^ay as those of tobacco. In this case, the ether 

 fraction showed neither activity nor the presence of indolic com- 

 pounds. The aqueous fraction represented in the figure exhibited 

 a high level of activity, again at about Rf 0.5, although chromogenic 

 reactions suggested the presence of an indole at Rf 0.41. The hor- 

 mone profile of an aqueous acetone extract of the bamboo Sinocala- 

 miis oldJiami was very similar to that of B. 77iultiplex. 



240 



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UJ 

 Q. 



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160 



80 



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B. MULTIPLEX 



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0.4 0.6 



Rf 

 FiR. 6. Water-soluble growth substances from Bambusa iiudtiplex 



0.8 



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