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Action de la 5-bromouracile et de ses nucléosides sur la morphogénèse des boutures de plantules étiolées de Tomate

Action of 5-bromouracil and its nucleosides on the morphogenesis of the cuttings of etiolated tomato seedlings

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Summary

  1. 1.

    5-Bromouracil inhibits the growth of the hypocotyl and the rhizogenesis in the cuttings of etiolated tomato seedlings only at high concentrations. 5-Bromouridine is inactive, but 5-bromodeoxyuridine strongly inhibits both phenomena.

  2. 2.

    The inhibition induced by 5-bromouracil cannot be reversed by thymine, deoxythymidine, uracil, uidine or β-alanine, a catabolic product of uracil.

  3. 3.

    Deoxythymidine is the one pyrimidine nucleoside which reverses the inhibition of growth and rhizogenesis brought about by 5-bromodeoxyuridine.

  4. 4.

    Deoxycytidine enhances the inhibition of rhizogenesis caused by 5-bromodeoxyuridine. Such an effect on the growth of the hypocotyl is not observed.

  5. 5.

    Taking into consideration the data in the literature, it is concluded: a)5-bromouracil can act in several ways which possibly differ according to the plant species: in some instances (as in the case described here), it seems to act by a mechanism unconnected with the metabolism of pyrimidine nucleic bases: b) 5-bromodeoxyuridine is a specific antimetabolite of deoxythymidine, but other metabolic interactions exist between 5-bromodeoxyuridine and deoxycytidine, each of the latter substances probably acting as a modifier of the metabolism of the other.

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  1. Laboratoire de Physiologie végétale (I.U.T.), Institut de botanique Clermont-Ferrand, France

    A. Guillot

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Guillot, A. Action de la 5-bromouracile et de ses nucléosides sur la morphogénèse des boutures de plantules étiolées de Tomate. Planta 97, 269–280 (1971). https://doi.org/10.1007/BF00389207

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  • DOI: https://doi.org/10.1007/BF00389207

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