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• W2051362004 abstract "Nuclear DNA replication and the development of preprophase bands (PPBs) are two chronologically close processes during the higher plant cell cycle. However, it is not clear whether occurrence of PPBs is coupled with DNA replication. A soybean protoplast culture with a high frequency of PPBs was used to study the relationship between the two processes when treated with aphidicolin, a potent and specific inhibitor of eukaryotic DNA polymerase-α. When DNA replication was partially inhibited by 10 mg l-1 aphidicolin, both the percentage of cells with PPBs and the mitotic index (MI) decreased in absolute terms, but there were proportionately more PPBs than mitoses. Since PPBs change in appearance as they develop, they were divided into categories of early (interphase associated) and late (prophase associated). The increased PPB/MI ratio was associated with an increased proportion of early stage PPBs relative to late stage PPBs. When DNA replication was completely blocked by 50 mg l-1 aphidicolin, both MI and the percentage of cells with PPBs were close to zero. These results suggest that development of PPBs was to a large extent coupled DNA replication. We propose that the increased PPB/MI ratio at 10 mg l-1 aphidicolin was due to a linkage between the duration of interphase and the time period in which early stage PPBs are visible. The increased duration of early PPBs partially compensates for the reduced number of nuclei reaching the stage of PPB initiation. Furthermore, in cultures containing aphidicolin, the percentage of PPBs with simultaneous perinuclear fluorescence (PNF, accumulation of microtubules on nuclear envelope) was reduced and whenever PNF was prominent and dense on the nuclear envelope the nucleus showed chromatin condensation. These observations indicated that the transition from PPB to PNF and then to the prophase spindle is closely related to the progress of the nuclear cycle." @default.
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• W2051362004 date "1991-06-01" @default.
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• W2051362004 title "DNA replication and the development of preprophase bands in soybean protoplast cultures" @default.
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• W2051362004 doi "https://doi.org/10.1111/j.1399-3054.1991.tb00074.x" @default.
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