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Nucleic Acids Research, 1984, Vol. 12, No. 2 1039-1048
© 1984

MOLECULAR BIOLOGY

Diversity of the ribosomal structures in the Euglena gracilis chloroplast genome: description of a mutant with two ribosomal operons and possible mechanism for its production

Patrick Ravel-Chapuis, Frédéric Flamant, Paul Nicolas, Philippe Heizmann and Victor Nigon

CNRS LA 92, Département de Biologic Générale et Appliquée, Université Lyon 1 69622 Villeurbanne Cedex, France

Received October 13, 1983. Revised December 6, 1983. Accepted December 6, 1983.

We studied the bleached mutant of Euglena gracilis Y3 producing carotenoids and rich in chioroplast DNA. This mutant which was produced more than twenty years ago segregates permanently, forming 30 to 50% daughter cells without carotenoids and poor in chloroplast DNA. Electron microscopy and mapping with restriction enzymes show the deletion of a complete ribosomal operon out of the three present in the oriqinal Strain.


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