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Journal of Cell Science, Vol 17, Issue 3 461-470, Copyright © 1975 by Company of Biologists

JOURNAL ARTICLES

Meiosis in Coprinus VII. The prekaryogamy S-phase and the postkaryogamy DNA replication in C. lagopus

BC Lu and DY Jeng

The kinetics of incorporation of 32P into DNA have unequivocally shown that the premeiotic S-phase in Coprinus lagopus occurs before the onset of karyogamy. It takes 8 h under the control conditions (25 degrees C with a 16 h light-8 h dark regime) but only 6 h under the arrest-release conditions. An important discovery in this study is that the initiation of premeiotic DNA replication is subject to an arrest by restrictive conditions (35 degrees C under a continuous light regime) whereas that of the mitotic replication is not. Once initiated, meiotic DNA replication can continue even under the restrictive conditions. Incorporation of 32P into DNA at pachytene is quite extensive. These replications are considered to be repair replications.


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© The Company of Biologists Ltd 1975