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Abstract
Relative changes in plastid DNA content in each stage of plastid division were investigated in order to better understand the division cycle of plastids in spore mother cells in the horwortAnthoceros punctatus. Samples of cells stained with DAPI were observed with epifluorescence microscopy and CHIAS. In spore mother cells of this species, plastids duplicated their own DNA prior to the plastidkinesis of the first plastid division, but did not replicate plastid DNA prior to the plastidkinesis of the second plastid division. Therefore, the DNA content of those plastids in which division had been completed was reduced to half its initial value. This indicates that the DNA replication pattern of plastids in spore mother cells corresponds to that of cell nuclei during premeiosis and meiosis inA. punctatus.
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