[Relationship between the duration of the mitotic cycle and the G2-period in sister cells of wheat root meristem and the ratio of their lengths].

The frequency of different types of pairs and triads of sister cells with labelled or unlabelled cells in mitosis was determined at different times after short-term incubation with 3H-thymidine to establish whether the mitotic cycle and G2-period duration depends on the cell length. Out of two sister cells of the pair, the larger cell used to have shorter mitotic cycle and G2-period than the smaller one. No direct dependence of the different ratios between their lengths was, however, shown. This is due to the absence of direct correlation between the mitotic cycle and G2-period durations. Possible causes of the absence of such a correlation are discussed.