[Somaclonal variability of sugarbeet plants on the basis of pollen sterility]. / Somaklonal'naia izmenchivost' rastenii sakharnoi svekly po priznaku steril'nosti pyl'tsy.

The nature of pollen sterility in sugarbeet regenerated plants obtained from callus cultures of inbred lines has been investigated. It has been shown that detected male sterility of plants can be caused both by epigenetic and mutation factors. The forms with cytoplasmic and nuclear sterility have been selected.

[Genetic control of morphological characters of the beet (Beta vulgaris L.)]. / Geneticheskii kontrol' morfologicheskikh priznakov svelky (Beta vulgaris L.)

A brief review of theoretical and practical results of investigation of genetical control of a number of traits of beet, including self-incompatibility, monogerm-multigerm, cytoplasmic male sterility and some others is presented. Data concerning linkage groups of individual genes, determining morphological and biochemical traits are demonstrated.

[Genomic variability of sugar beet morphogenic and non-morphogenic callus]. / Genomnaia izmenchivost' morfogennogo i nemorfogennogo kallusa kormovoi svekly.

Cytogenetic characters and the level of DNA methylation were studied in sugarbeet callus cultures with different morphogenic potential which were obtained from the same leaf explant. It was shown that non-morphogenic callus in comparison with the morphogenic one was characterized by the higher level of cell ploidy and of the frequency of chromosome structural rearrangements even at the early stages of cultivation. Overspiralization of chromosomes and formation of condensed chromatin were observed in polyploid cells of non-morphogenic callus. At the same time cytosine hypermethylation occurs in site-specific CpCpGpG-sequences of DNA indicating the possible role of this DNA modification in the processes of genome rearrangements.

[Manifestation of "hairy leaf" trait in mangel beet]. / Proiavlenie priznaka opushennosti listovoi plastinki u kormovoi svekly.

New morphological trait, "Hairy leaf", of mangel beet has been picked out. Dominant character and monogenic inheritance of the trait were found. Comparative analysis of manifestation of this trait in mangel and sugar beets was done. It is shown that the gene of "hairiness" (Hl) in sugar beet is not allelic to the Hlvar gene in mangel beet. This trait can be used as a marker in selection-genetical investigation.

[The manifestation of the determinative growth trait in the shoots of fodder beet seed plants]. / Proiavlenie priznaka ogranichennogo rosta pobegov u semennikov kormovoi svekly.

The peculiarities of manifestation of character "determination growth of shoots" in materials of lines of mangel beet was studied. The several types of flowering shoots with various phenotypes were picked out. Recessive nature of the character and its inheritance were established.