Modifications of chloroplast DNA during streptomycin induced mutagenesis in Euglena gracilis |
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Authors: | Philippe Heizmann Younis Hussein Paul Nicolas Victor Nigon |
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Affiliation: | (1) Département de Biologie Générale, Université Claude Bernard Lyon 1, 43, Boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France;(2) Present address: Department of Genetics, Faculty of Agriculture, Assiut, Egypt |
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Abstract: | Summary The evolution of chloroplast DNA was analysed during streptomycin induced mutagenesis in Euglena gracilis strain bacillaris and strain Z. In addition to a massive reduction of the cellular level of chloroplast DNA, several structural modifications have been observed in early stages of mutagenesis but they are generally eliminated during the later stages. The ribosomal cistrons are regularly rearranged: two of the three tandemly arranged cistrons occuring in wild type chloroplast DNA decrease while the third one is relatively more conserved and amplified during mutagenesis and in bleached mutants. |
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Keywords: | Chloroplast DNA Mutagenesis Ribosomal cistron Amplification Euglena |
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