86 • Floral Hormones and the Induced Statf 



B 



Fig. 5-3. Experiments with grafting of single leaves in 

 Perilla. (A) Technique. Left, donor leaf in polyethylene bag. 

 Right, bag removed; in this case the leaf has been trimmed 

 to give a standard surface area. (B) Induction of flowering 

 in long days by a grafted leaf previously exposed to 36 short 

 days. Photograph made 41 days after grafting. (Photographs 

 from Zecvaart [1958], courtesy of Dr. J. A. D. Zeevaart, 

 Agricultural Institute, Wageningen.) 



