Chaotization of division spindle, phragmoplast, and telophase chromosome groups in wheat wheatgrass F1 hybrids meiosis

The phenomenon of the disorientation of completely formed systemic cytoskeleton structures, i.e., the division spindle and phragmoplast, into the constituent elements and their transformation into a network of disoriented fibers in the course of cell division is described. The phenomenon of the disintegration and dispersion in the cytoplasm of completely formed telophase chromosome groups, which is not associated with the chaotization of the cytoskeleton structures, is also described. These abnormalities are revealed in the meiosis of pollen mother cells of the first generation of wheat-wheatgrass hybrids. The chaotization of cytoskeleton structures is a only normal phenomenon in plant-cell division in late prophase-early prometaphase, whereas, at stages of metaphase and telophase, it can indicate a disturbance in the time regulation of the cytoskeleton cycle in the course of meiotic division. The disintegration of the chromosome telophase groups and their movement backwards to the spindle equator can indicate the untimely involvement of processes of prometaphase, specifically the activation of chromokinesins. The significance of the process of cytoskeleton chaotization in the biology of a plant cell is discussed.