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Plant and Cell Physiology, 1986, Vol. 27, No. 2 261-264
© 1986

Article

Early Replication of Highly Repeated DNA Sequences during Dedifferentiation of Carrot

Atsushi Kato and Shigeyuki Tanifuji

Department of Botany, Faculty of Science, Hokkaido University Sapporo 060, Japan

When carrot explants are placed on an agar medium containing phytohormones, a satellite DNA begins to replicate earlier than the bulk DNA during the first cell division cycle. The majority of this early replicating satellite DNA was previously shown to have an identical buoyant density to ribosomal DNA (rDNA) (Hase et al. 1982). Molecular sizes of EcoRI-digests of 3H-labeled DNA were analyzed in the present study by gel electrophoresis followed by fluorography. Most of the labeled DNA bands did not correspond to EcoRI-digests of carrot rDNA. The results indicated that the majority of the early replicating satellite DNA is not rDNA, but probably a type or types of highly repeated DNA sequences.

(Received June 6, 1985; Accepted November 4, 1985)
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