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Quelques observations nouvelles sur les relations entre la synthèse des acides ribonucléiques et la morphogénèse chezAcetabularia

✍ Scribed by J. Brachet; N. Six

Publisher
Springer-Verlag
Year
1966
Tongue
English
Weight
873 KB
Volume
68
Category
Article
ISSN
0032-0935

No coin nor oath required. For personal study only.

✦ Synopsis

Requ le 27 Septembre 1965

Summary. 1. In rive treatment with I~Nase considerably increases (80%) the I~NA content of anucleate and nucleate fragments as well as of whole algae (Acetabularia mediterranea). A parallel increase hi the incorporation of phenylalanine into proteins is observed.

  1. Prolonged actinomycin (30 ~zg/ml) treatment (7--15 days) results in a decrease in the amount of RNA in whole algae and in anueleate apical fragments. This is not, however, the case for the basal anucleate fragments of the stalk.

The fact that RNA synthesis in this region resists such treatment with actinomycin seems to bear some relation to the extreme limitation of their morphogenetie capacities.

  1. The biological effects of l~Nase are increased by the simultaneous addition in vivo of aethmmycin.

  2. Thymus histones and polylysine influence morphogenesis in the same manner as actinomycin though to a lesser extent.

  3. Anucleate fragments are much more sensitive than the nucleate fragments to levorphanol, which probably inhibits preferentially ribosomal I~NA synthesis.

  4. The significance of these results is discussed.

* D@di~ au Professeur J. HX~ING, ~ t'occasion de son 65~ anniversaire. Planfia (Berl.), Bd. 68 16

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