Comparative studies of chloroplastic and nuclear DNA repair abilities after ultraviolet irradiation of Euglena gracilis |
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| Authors: | Paul Nicolas Younis Hussein Philippe Heizmann and Victor Nigon |
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| Institution: | (1) Département de Biologie générale et appliquée, Université Claude-Bernard Lyon I, 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 Studies of nuclear and chloroplastic-DNA repair after ultraviolet irradiation of Euglena gracilis show that photoreactivation is very efficient at both the nuclear and chloroplastic level. Liquid-holding or split-dose experiments and treatment with caffeine reveal, furthermore, that dark-repair is very efficient in nuclear DNA but not in chloroplastic DNA (ctDNA). The possibility of a chloroplastic dark-repair of restricted efficiency is discussed.Determination of chloroplastic DNA content by reassociation kinetics indicates that an important degradation follows UV irradiation during liquid holding in the dark. |
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