Vernalization and Photoperiodism —90— A Symposium 



In consideration of nutrition of reproductive plants one should always 

 bear in mind the fact that the reproductive organs, directly or indirectly, 

 have a marked influence, both stimulating and retarding, on metabolism and 

 vegetative development of the plant, which is often striking. This supple- 

 mentary and in a way converse conception to the usually accepted idea that 

 nutrition makes the plant develop in one direction or another is based on 

 a considerable body of experimental evidence. It helps to explain more 

 precisely metabolic changes and chemical composition of plants brought 

 about as a result of photoperiodism and other environmental factors con- 

 ducive to sexual reproduction. 



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