Department of Botany, University of Edinburgh, Mayfield Road, EH9, 3JH, Edinburgh, UK.
Planta. 1978 Jan;139(3):273-9. doi: 10.1007/BF00388641.
The changes in cell number, the relative proportions of interphase nuclei with different amounts of DNA, mitotic index and labelling index have been investigated in the shoot apex of Silene coeli-rosa L. (a long-day plant) during the first long day of photoinduction, and compared with the corresponding changes in plants in short days. 3 h after the start of induction the proportion of nuclei in the G2 phase of the cell cycle had increased, the mitotic index tended to be higher, and the labelling index was lower than in plants in short days. 8-9 h later the values for plants in the long day had become similar to those for plants in short days. No evidence was obtained for a synchronisation of cells in one phase of the cell cycle as a result of photoinduction. The results obtained were consistent with a temporary shortening of the cell cycle in the induced apices over the first long day which resulted in a greater increase in cell number by the end of the first day of photoinduction than in plants in short days.
在长日照诱导的第一天，我们研究了长日植物天蓝矢车菊（Silene coeli-rosa L.）茎尖细胞数量的变化、具有不同 DNA 含量的间期核的相对比例、有丝分裂指数和标记指数，并将其与短日照条件下植物的相应变化进行了比较。诱导开始后 3 小时，细胞周期 G2 期的核比例增加，有丝分裂指数趋于升高，标记指数低于短日照条件下的植物。8-9 小时后，长日照条件下植物的值变得与短日照条件下的植物相似。没有证据表明光诱导会导致细胞在细胞周期的一个阶段同步。所得结果与诱导顶端在第一个长日照期间细胞周期暂时缩短一致，这导致在光诱导的第一天结束时，细胞数量的增加大于短日照条件下的植物。
