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Time-dependent reversal of the inhibitory effect of 5-fluorode-oxyuridine on flowering ofChenopodium rubrum L. by thymidine

Casově závislé překonání inhibiěního úěinku 5-fluordesoxyuridinu na kvetení uChencpodium rubrum L. thymidinem

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Biologia Plantarum

Abstract

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.

Abstract

Začátek kvetení uChenopodium rubrum L. vyvolaný třemi indukěními fotoperiodami byl zcela inhibován aplikací 5 μl roztoku 1×10−5 m 5-fluordesoxyuridinu (FDU) na vegetační vrchol. Tato inhibice může být překonána thymidinem aplikovaným současně nebo po aplikaci FDU v kterékoli době v průběhu fotoperiodické indukce. Jeden den po skončení indukce nelze inhibici způsobenou FDU překonat ani zvýšenými koncentracemi, thymidinu. Pokusy nasvědčují tomu, že fotoperiodická indukce probíhá uChenopodium rubrum i tehdy, když synthesa DNA je potlačena.

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Authors and Affiliations

  1. Department of Plant Physiology, Institute of Experimental Botany, Czechoslovak Academy of Sciences, Praha

    J. Krekule, Frideta Seidlová & J. Ullmann

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  1. J. Krekule
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  2. Frideta Seidlová
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  3. J. Ullmann
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Address: Ke dvoru 15, Praha 6-Vokovice, Czechoslovakia.

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Krekule, J., Seidlová, F. & Ullmann, J. Time-dependent reversal of the inhibitory effect of 5-fluorode-oxyuridine on flowering ofChenopodium rubrum L. by thymidine. Biol Plant 11, 477–480 (1969). https://doi.org/10.1007/BF02920713

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  • DOI: https://doi.org/10.1007/BF02920713

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