Abstract
The relationship between the beginning of DNA replication and the onset of cell division in embryonic maize tissues during germination was examined. Biochemical and cytological evidence indicates that DNA replication starts after around 14 h of imbibition of maize embryos. Between 15 to 20 h typical replicative DNA synthesis can be detected, reaching its highest value at 40 h. The first mitotic figures appear in mesocotyl 28 h after imbibition followed by seminal (32 h) and primary root (36 h) meristems. The kinetic pattern observed for the dividing cells throughout the germination period suggests that me- ristematic tissues consist of distinct cell populations, which might re-enter the cycle at different times during seed germination.
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