Microspectrophotometric analysis of DNA replication in Eudorina elegans (Volvocales, Chlorophyta)

Abstract

The temporal relationship of DNA replication and nuclear division has been examined by Feulgen microspectro-photometry in the colonial alga Eudorina elegans. DNA replication was found to precede each nuclear division and to occupy the entire 10–15 min interphase between divisions. Conventional G1 and G2 phases are absent or are very brief in Eudorina. Nuclear growth occurred during the interval of rapid divisions compensating, to a large extent, for the decrease in nuclear size resulting from the division sequences.