Genome Structural-Functional Peculiarities Affecting Plant Epigenetic Variability and Evolution

There is an attempt to explain some evolutionary processes in plants such as saltatory changes on the base of multidimensionality of plant inherited information coding. According to the suggested hypothesis, inherited information is coded by not only a nucleotide sequence but also by chromosome differential endoreduplication. It is supposed that chromosomes compete among each other for the contact with the nuclear membrane, but a change in the endoreduplication degree of various chromosome sites can result in a change of a competition ability for the contact with a nuclear membrane. A simultaneous increase of chromosome endoreduplication degree of many sites can lead to an increase of nuclear membrane surface and to a change in chromosome competitive interrelations and, respectively, to a change of activity of many genes. Phenotypicaly it may manifest itself as a saltatory change of many traits

Limitation of F1 hybrids uniformity law

Using isozymes as markers, data indicative of polymorphisms in the progeny produced from crossing two beet plants, homozygous on contrastive alleles of enzyme loci, were obtained

Autosegregation of enzyme loci Me1 and Gpi2 in agamospermous progenies of triploid sugarbeet plants

Ratios of malic-enzyme (ME1) and glucosephosphate isomerase (GPI2) phenotypic classes were studied in agamospermous progenies of triploid sugar beet plants. It was shown that the ratio of enzymes phenotypic classes quite well accords with the calculations based on the supposition about reduplication of chromosome sites carrying alleles of enzyme loci accompanied by a loss of excessive allelic copies in the first cell division under embryogenesis. Polyteny – conditioned allelic dose increase leads to the occurrence of alleles – absent in the initial parent – at a certain frequency in the developing progeny. The notions of “meiotic autosegregation” and “mitotic autosegregation” – typical of meiotic and mitotic agamospermy, respectively, – were introduced; the term locus “polygenotype” characterizing the allelic composition of locus, number of chromosomes and a copies number of chromatides sites carrying marker-locus alleles in the cell before entering embryogenesis was also introduced

Post-meiotic apozygotic combinatory process in sugar beet (Beta vulgaris L.)

The effect of colchicine on phenotypic classes ratio of the enzyme locus controlling alcohol dehydrogenase (ADH1) in sugar beet agamospermous progenies was analyzed. The obtained data are indicative of the thing that colchicine causes polytenization of homological chromosome regions carrying marker locus Adh1 alleles. Theoretical calculation of the formation of egg cell frequencies and those of further development of cells entering embryogenesis without fertilization, also the diminution calculation of excessive chromosome regions carrying marker locus alleles have been made. The coincidence of theoretical and experimental ratios of phenotypic classes indicates the existence of a post-meiotic apozygotic combinatory process in plants

Effect of prolonged hypokinesia on tissue blood flow

The influence of hypokinesia on the blood flow in the tissues of rabbits was studied. Motor activity of animals was restricted during 90 days and blood flow recorded through resorption rate of NaI-131. Perfusion of tissues under the influence of hypokinesia was found to be reduced

The Scottish Independence Referendum and the Principles of Democratic Secession

On September 18, 2014, Scottish voters decided whether to sever the 307 years of unity between Scotland and the United Kingdom in an independence referendum. While the voters ultimately rejected independence, the process by which the Scots accomplished this historic exercise will inform further democratic secession movements. This Note examines the significant implications of Scotland’s independence referendum by assessing the history of independence referendums and the present scope of relevant international law. The formative history of the independence referendum and modern precedential examples established the requirements for democratic secession. In turn, the Scottish independence referendum, in the context of evolving law and state practice, can provide a powerful rubric for future attempts at secession by independence referendum

Phenotypic class ratios as marker signs of different types of agamospermy

This article focuses on the development of the method for the genetic classification of agamospermous reproduction types in plants using sugar beet as an example. The classification feasibility is ensured by the use of isozymes as genetic markers allowing the identification of all three phenotypic classes in the progeny of individual heterozygous diploid plant and is based on different phenotypic class ratios in the progenies obtained by meiotic and mitotic agamospermy. The data indicate that for sugar beet meiotic agamospermy is the more typical since 13 of 15 explored progenies were classified as those produced by meiotic agamospermy and only 2 as produced by mitotic agamospermy.Comment: 8 pages, 2 tables, 23 reference