[A cytogenetic study of the blue-grain line of the common wheat cultivar Saratovskaya 29].

The chromosome composition of the blue-grain line i:S29Ba of the cultivar Saratovskaya 29 was identified by cytological, GISH, and microsatellite analyses and C-banding. It was found that common wheat chromosome 4B of the cultivar Saratovskaya 29 was substituted with the Agropyron elongatum Host. chromosome carrying the gene for blue grain (s:S294Ag(4B)) during the construction of this nearly isogenic line. The blue-grain line was tested for productivity. The substitution of total chromosome 4B of the cultivar Saratovskaya 29 by Ag. elongatum chromosome 4 did not significantly affect the spike productivity parameters and grain quality with the exception of spike length (plus effect), spike density, and vitreousness (minus effects). The blue-grain line with s:S294Ag(4B) can be used in further studies associated with chromosome engineering in cereals and wheat breeding.

[Dynamics of microtubular cytoskeleton during meiosis in higher plants. VIII. Comparison between successive and simultaneous cytokinesis].

The abnormal cytoskeleton cycle in meiosis in pollen mother cells of cereal wide hybrids F reveals the role of polar microtubules in phragmoplast formation during successive cytokinesis. The cytoskeletal rearrangements during successive and simultaneous cytokinesis in higher plant meiosis are compared.

[Altering of phragmoplast orientation as a result of excessive centrifugal movement in the absence of cell plate].

The inability of phragmoplast to stop its centrifugal movement after reaching the mother cell membrane is described in abnormal meiosis with the arrest of cell plate formation. The excess of phragmoplast expansion leads to rotation of the whole telophase figure (phragmoplast with daughter nuclei) within the cell through 90 degrees. It has been suggested that this phenomenon may occur because of a the lack of signal stopping cytokinesis. Such a signal arises due to formation of daughter cell membranes.