Seasonal Changes in the Distribution of Photo-assimilated 14C in Young Pine Plants

Abstract
Pinus strobus L. plants in their third year of growth were permitted to photoassimilate 14CO2 for about 1 hour at monthly intervals between April and October, and the subsequent distribution of 14C in these plants was determined 8 hours, 1 month, 2 months or 4 months after photo-assimilation. In this way, the fate of 14CO2 photo-assimilated during different months of the growing season was observed.