Svetlana Sergeevna Kirikovich

arXiv2013

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.

q-bio.GN↗

arXiv2012

Zygotic combinatorial process in plants

Experimental data that prove the existence of the zygotic combinatorial process occurring in an embryogenesis-entering zygote are presented in the paper. The zygotic combinatorial process is found when analyzing F1 hybrid plants obtained from crossing homozygous forms different, minimum, in two marker enzymes, and it is found in that hybrid plant which, with one marker enzyme heterozygous spectrum, has a homozygous spectrum of the other. The zygotic combinatorial process leads to F1 hybrids uniformity aberration. The zygotic combinatory process revealed in the study is supposed to be conditioned by chromosome polyteny in mother plant cells and diminution of chromatin excess from the embryogenesis-entering zygote. An obligatory condition for combinatorial process is the presence of free exchange of cromatides among homological chromosomes in an embryogenesis-entering cell, i.e. the presence of crossing-over analogous to the one proceeding at meiosis. The found combinatorial process and the earlier-obtained data confirm the hypothesis on multi-dimensionality of inherited information coding. Differential polyteny of certain chromosome regions can lead to differences among homozygous plants having the same alleles in genes located in polytenized regions and controlling morpho-physiological traits.

q-bio.GN↗