Letter | Published:

Influence of Localized Ultra-violet Irradiation on the Incorporation of Adenine-8-14C and D,L-Methionine-35S in Acetabularia mediterranea

Naturevolume 187pages954955 (1960) | Download Citation



WE have shown recently1,2 that methionine labelled with sulphur-35 is incorporated in a decreasing apico-basal gradient in the unicellular alga Acetabularia mediterranea. The existence of this gradient suggested a possible relationship between methionine incorporation, ribonucleic acid metabolism and the production of morphogenetic substances in this alga. We have now examined the effects of localized ultra-violet irradiation, delivered to algal stem tips or rhizoids, on morphogenesis and adenine and methionine incorporation, in order further to evaluate the reality of this relationship and its implications.

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    Olszewska, M. J., and Brachet, J., Arch. Internat. Biochem. (in the press).

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    Olszewska, M. J., and Brachet, J., Exp. Cell Res. (in the press).

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    Errera, M., and Vanderhaeghe, F., Exp. Cell Res., 13, 1 (1957).

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    Stich, H., and Plaut, W., J. Biophys. Biochem. Cytol., 4, 119 (1958).

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    Present address: Laboratory of Plant Anatomy and Cytology, University of Łódz, Łódz, Poland

  1. M. J. OLSZEWSKA: Fellow of the Rockefeller Foundation


  1. Laboratoire de Morphologie animale, Université libre de Bruxelles

    • J. BRACHET
    •  & M. J. OLSZEWSKA


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