Abstract
When Pleurodeles (Amphibian, Urodele) females were subjected to high temperatures (32–35 °C) for varying periods of time (45 min to 7 days), lampbrush chromosome structure underwent striking modifications. These changes included a numerical reduction in normal loops and progressive disorganization of RNP matrices of various loops. The degree of such disorganization was a function of the intensity and duration of the stress. These modifications were completely reversible when females or oocytes were returned to a normal breeding temperature (20 °C). Results are discussed in comparison with previous studies on morphological changes induced by heat shock in lampbrush chromosomes carried out in vitro.
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