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Flower initiation induced by three inductive photoperiods inChenopodium rubrum L. was fully inhibited by treating the shoot apex with a 5 μl drop of 1×10−5 m 5-fluorodeoxyuridine (FDU). This inhibition may be reversed by thymidine applied simultaneously with or after FDU treatment at any time during photoperiodic induction. One day after the end of induction the inhibition caused by FDU is irreparable even by increasing thymidine concentrations. It is concluded that photoperiodic floral induction may take place inChenopodium even if DNA synthesis is suppressed.
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Krekule et al. (1969) studied this question.
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