Mobilization and Incorporation of Photoassimilated 14C by Growing Vegetative and Reproductive Tissues of Adult

Variations in translocation and incorporation of 14Clabeled photosynthate in actively growing vegetative and reproductive tissues of 20-year-old Pinus resinosa trees with time were investigated. Five hours after exposure of 1-yearold needles on second order branches to 14CO2 , 90% of the recoverable activity was still in the needles. The 1-year-old bark showed a small amount of activity, but terminal sinks had accumulated little 14C. After 24 hours, activity in the 1-year-old needles decreased to 59% while actively growing terminal and lateral shoots and 2nd year cones had accumulated considerable tracer. Whereas activity in the 1-year-old bark increased, recovery from the 1-year-old wood was only 1.8%. After 1 week, relative activity in the 1-year-old needles had declined to 27%. Recovery of 14C from various sinks was high and in the following order: 2nd year cones > terminal needles > lateral needles > terminal internode

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