Amitosis, different from mitosis, is a rare form of the proliferation of the cells. Most amitosis were observed in animal cells; only few of them were reported in plant cells. The cytological investigation in this stu...Amitosis, different from mitosis, is a rare form of the proliferation of the cells. Most amitosis were observed in animal cells; only few of them were reported in plant cells. The cytological investigation in this study demonstrated first time in Pelargonium zonale two different amitotic nuclear division ways： cleavage and constriction, in which no appearance of the visible chromosomes and no spindles were observed. After amitotic nuclear division the cytokinesis was also observed, in which the cytoplasm divided directly into two or more parts accompany with formation of two or more daughter cells. This study showed the genetic material may sometimes be unequally distributed between the daughter cells in amitosis, and the amitosis could lead to bi-, tri- and multinucleated cells. These new findings are discussed in regard to the nuclear amitotic process in polyploid cells which gives rise to smaller, viable nuclei in multinucleated cells with reduced numbers of genomes. It was suggested that amitosis could be a way of the division of the endoreduplicated cells.展开更多
文摘Amitosis, different from mitosis, is a rare form of the proliferation of the cells. Most amitosis were observed in animal cells; only few of them were reported in plant cells. The cytological investigation in this study demonstrated first time in Pelargonium zonale two different amitotic nuclear division ways： cleavage and constriction, in which no appearance of the visible chromosomes and no spindles were observed. After amitotic nuclear division the cytokinesis was also observed, in which the cytoplasm divided directly into two or more parts accompany with formation of two or more daughter cells. This study showed the genetic material may sometimes be unequally distributed between the daughter cells in amitosis, and the amitosis could lead to bi-, tri- and multinucleated cells. These new findings are discussed in regard to the nuclear amitotic process in polyploid cells which gives rise to smaller, viable nuclei in multinucleated cells with reduced numbers of genomes. It was suggested that amitosis could be a way of the division of the endoreduplicated cells.
