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Cyto photometric and auto radiographic studies on distribution in the mitotic cycle of primary cortex cells in roots of triticum aestivum 2. a zone of dna synthesis in cells without their division



Cyto photometric and auto radiographic studies on distribution in the mitotic cycle of primary cortex cells in roots of triticum aestivum 2. a zone of dna synthesis in cells without their division



Tsitologiya 24(1): 17-25



Autoradiographic and cytophotometric studies on cell distribution in the 2 outer layers of the cortex, within the mitotic cycle in the division zone of T. aestivum roots have been performed. In longitudinal rows of the primary cortex layers, the division zone occupied a root zone 800 .mu. in length starting from the row initials. The cell distribution according to their DNA content in the same cortex layers of the root, where cells synthesize DNA but do not divide, was reported. In a zone 801-1400 .mu. from the initials, cells in the G1- and S-periods decrease in number, whereas cells in G2- and incomplete S-periods increase, compared to those in the division zone. The beginning of elongation did not arrest the synthesis of DNA. The inhibition of the cellular transition from G1- into the S-period occurred in the end of the division zone, although it took place later than the inhibition of cell transition towards division. In the end of the division zone, some of the cells in the G1-period succeeded in starting DNA synthesis to complete (or not to complete) the replication of the whole DNA in the area 801-1400 .mu. in length. Apparently, these cells, that covered as much as .apprx. 25% of the total quantity of cells, can be considered as endoreduplicated. It is impossible to distinguish between the cells that passed through the S-period of the mitotic or the endoreduplicative cycle. In some tissues, cell distribution according to their DNA content can be determined by their division zone. In other ones it depends on the root zone length where cells do synthesize DNA but do not divide.

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