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Nucleic Acids Research, 1980, Vol. 8, No. 12 2843-2858
© 1980

Articles

Variations in the satellite DNA content of Cucomis melo in relation to dedifferentiation and hormone concentration

J. Grisvard and A. Tuffet-Anghileri

Biologie Moléculaire Végétale, Université Paris XI 91 405 Orsay, France

Received February 19, 1980. Total DNA from Cucumis, melo contains a 1.706 satellite DNA which can be resolved into two components; one of these components has a higher temperature of melting (component I) than the other (component II). In this study, we have further investigated these components by thermal denaturation and by Eco R1 digestion. Component II reveals a homogeneous melting profile and is only partially cleaved by Eco R1, whereas component II reveals a heterogeneous melting profile and is entirely digested by Eco R1. A possible mitochondrial origin for component II is discussed. When an in vitro culture of root tissues from Cucumis melo was initiated or when the phytohormone (NAA) concentration of established cultures was modified, a new satellite DNA (1.719) appears transitorily the satellite DNAs already present in seedlings undergo quantitative and possibly qualitative variations. Satellite DNAs therefore seem to be involved in the response to some physiological variations.


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