Functional and mutational variations of heterochromatic region in the maize nucleolus organizer (Variation of the NO heterochromatic region)

Functional and mutational variations of heterochromatic region in the maize nucleolus organizer... The following facts are considered in connection with the problem of population polymorphism at heterochromatic regions of maize chromosomes: (a) variation (1–3 μm) of the heterochromatic region of nucleolus organizer (NO knob) in pollen mother cell at the pachytene stage; (b) presumably function-dependent variation of the degree of its compaction (from a compact state in the majority of plants to a puff-like state); (c) the presence of rearrangements in the NO knob region (duplications and deletion); and (d) homozygous (in all cases) state of the NO knob. Deletion is combined with alterations in the structure of chromosomal NO and the overall karyotype. It is assumed that inbreeding and MGEs influence the mutability of the NO locus and activation of the gene set controlling cytokinesis, chemical reduplication, and, possibly, rDNA amplification. The mutation was classified as a systemic mutation. The mechanisms of NO knob homozygotization in meiosis (mitosis) and the mechanisms of maintenance of the polymorphism at functionally inactive chromosome knob regions in maize populations are compared. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Genetics Springer Journals

Functional and mutational variations of heterochromatic region in the maize nucleolus organizer (Variation of the NO heterochromatic region)

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Publisher
Springer Journals
Copyright
Copyright © 2009 by Pleiades Publishing, Ltd.
Subject
Biomedicine; Microbial Genetics and Genomics; Animal Genetics and Genomics; Human Genetics
ISSN
1022-7954
eISSN
1608-3369
D.O.I.
10.1134/S1022795409050068
Publisher site
See Article on Publisher Site

Abstract

The following facts are considered in connection with the problem of population polymorphism at heterochromatic regions of maize chromosomes: (a) variation (1–3 μm) of the heterochromatic region of nucleolus organizer (NO knob) in pollen mother cell at the pachytene stage; (b) presumably function-dependent variation of the degree of its compaction (from a compact state in the majority of plants to a puff-like state); (c) the presence of rearrangements in the NO knob region (duplications and deletion); and (d) homozygous (in all cases) state of the NO knob. Deletion is combined with alterations in the structure of chromosomal NO and the overall karyotype. It is assumed that inbreeding and MGEs influence the mutability of the NO locus and activation of the gene set controlling cytokinesis, chemical reduplication, and, possibly, rDNA amplification. The mutation was classified as a systemic mutation. The mechanisms of NO knob homozygotization in meiosis (mitosis) and the mechanisms of maintenance of the polymorphism at functionally inactive chromosome knob regions in maize populations are compared.

Journal

Russian Journal of GeneticsSpringer Journals

Published: May 17, 2009

References

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