692 



LIGHT AND LIFE 



Terminal Bud Configurations 



J) 



ABC 



E T I L AT E D 



^ 



^ 



B 



Green 

 Fig. 4. Terminal bud configurations of etiolated and green plants. 



internodes as sources of tissue for growth experiments, and that gieen 

 internodes shorter than 25 mm long are probably also inferior to 

 longer internodes. Despite the fact that this experiment is atypical 

 in showing depressed growth with GA, this type of result has been 

 generally obtained in other experiments. Therefore internodes as 

 near as possible to 30 mm long were selected as the most desirable 

 material for further studies. 



TABLE 2 



Effect of the Configuration of the Bud on the Growth of Pea Stem Sections 



Incubated in the Presence and Absence of Indole Acetic Acid (IAA) 



(10~* Ai for Etiolated, lO"'' M for Green Sections) and 



GiBBERELLIC AciD (GA) (10~^ M) 



