Total Uptake and Incorporation into DNA of 3H-Thymidine, 3H-Deoxyuridine and 3H-Thymine in the Primary Root of Vicia faba L.: I. INTACT ROOTS

Total uptake and incorporation of ³H-thymidine, ³H-thymine,and ³H-deoxyuridine into DNA have been investigated in the apical3 cm of the primary root of Vicia faba. Evidence has been obtainedthat endogenous TdR in these roots may be transported eitherapically or basally; apical movement being greater than movementfrom the apex towards the base of the root. The results havebeen discussed with respect to the possible distribution ofendogenous pools of thymidine, thymine, and deoxyuridine inthe primary root of V. faba.