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Experimental investigations into cytomorphogenesis in Micrasterias thomasiana and Micrasterias denticulata Bréb. under the influence of actinomycin d and ethidium bromide - I. Light-microscope investigations

Protoplasma, ISSN: 0033-183X, Vol: 86, Issue: 1-3, Page: 83-105
1975
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Article Description

Treatment of young differentiating cells of M. thomasiana and M. denticulata with actinomycin D or ethidium bromide respectively modifies the morphogenesis in a characteristic manner. The degree to which the rather complex cell form is realized depends on the age of the semicells at the beginning of the treatment. The treated semicells exhibit at least a species-specific minimum pattern, which depends on the "septum initial pattern" (Kiermayer 1970 b). Anormogenesis of young growing semicells usually leads to cell death by plasmoptysis; the formation of a secondary cellulose wall is inhibited. The drugs slow down the extension of the primary wall and prevent the stage-specific changes in the intracellular osmotic pressure. It is suggested that the control of cell form is a function of the growing primary wall and the plasmalemma themselves, which do not require guidance from the nucleus. © 1975 Springer-Verlag.

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