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Abstract
We have investigated the plastid DNA replication cycle of Anthoceros Punctatus. In mitotic cycles of this species, plastids divided into two daughter plastids with DNA synthesis. By contrast, in spore mother cells, the DNA content of plastids which had completed their division was halved as well as the DNA content of cell nuclei. The plastid DNA content of unfbrtilized egg cells did not change before and the fertilization because of prefbrential digestion of organelle DNA in sperm cells. In the 2n-generatio, plastids multiplied by binary fission, with DNA duplication. It is thought that plastid DNA content is halved in spore mother cells but recovers before, or immediately after, spore germination. In the n-generation, Plastids multiplied by binary fission, with DNA duplication, and the plastid DNA content was maintained at the same level as that of the 2ngeneration.
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