Jan., 1921] Translocation of Carbohydrate Materials 



95 



starch content during the dormant period in stems and roots 

 occurs from January to March, after which there is a gradual 

 increase until the inception of growth in spring. 



This decrease of starch during the dormant period is due 



o. 



partly to hydrolyzation to sugar and probably to slow respira- 

 tion, and in the case of roots to the formation of latex-like 

 material, as already mentioned. There is a possibility of some 



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Miry Juii^ Ou,/i 





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Fig. 5. Curves showing the percentage of total sugar and reducing sugars in 

 two-year-old seedlings of apple from June to April, 1919-1920. The ordinates 

 represent the percentage of carbohydrates and the abscissae, the season of the 

 year. 



fat or other synthesis. With the swelling of buds in the spring 

 a general decrease of starch and total carbohydrate occurs in 

 all parts of the plant. 



6. The role played by the different sugars is similar to that 

 described in the case of fruit spurs. Glucose and maltose are 

 the principal sugars of translocation. Glucose reaches its 

 maximum during the dormant period in all parts of the plant. 

 It decreases in stems very rapidly during the early spring and 

 increases in roots until April and then decreases owing to its 



