Heterochromatic Regions of Maize A- and B-Chromosomes

Heterochromatic Regions of Maize A- and B-Chromosomes A collection of maize forms from the Vavilov All-Russia Institute of Plant Breeding (VIR) was studied. We compared variation in the following traits: the number and size of heterochromatic knob regions (HKs) of chromosomes of mother pollen cells at pachytene depending on the presence (B+) or absence (B0) of B-chromosomes; size of B-chromosomes (general, of heterochromatic part); and the frequency of B+ plants in groups of forms contrasting in the HK number (10–15, 4–10, 2–7, 1–4). It was shown that B chromosomes had statistically significantly different effects on HK polymorphism, relative heterochromatin “content” in the cell of multiknob and knobless forms, selection of plants for early ear flowering in these forms. The combination of maximum (and minimum) sizes of heterochromatic regions of A- and B-chromosomes was established; the genomic level of control of the trait is suggested. The role of the relationship of polymorphism at heterochromatic regions of A- and B-chromosomes between them and with the systems of maize reproduction is considered as a mechanism of maintenance of optimum plant heterozygosity via adaptive ontogenetic redistribution of heterochromatin among loci, chromosomes, and gametes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Genetics Springer Journals

Heterochromatic Regions of Maize A- and B-Chromosomes

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2003 by MAIK “Nauka/Interperiodica”
Subject
Biomedicine; Human Genetics
ISSN
1022-7954
eISSN
1608-3369
D.O.I.
10.1023/A:1025727218430
Publisher site
See Article on Publisher Site

Abstract

A collection of maize forms from the Vavilov All-Russia Institute of Plant Breeding (VIR) was studied. We compared variation in the following traits: the number and size of heterochromatic knob regions (HKs) of chromosomes of mother pollen cells at pachytene depending on the presence (B+) or absence (B0) of B-chromosomes; size of B-chromosomes (general, of heterochromatic part); and the frequency of B+ plants in groups of forms contrasting in the HK number (10–15, 4–10, 2–7, 1–4). It was shown that B chromosomes had statistically significantly different effects on HK polymorphism, relative heterochromatin “content” in the cell of multiknob and knobless forms, selection of plants for early ear flowering in these forms. The combination of maximum (and minimum) sizes of heterochromatic regions of A- and B-chromosomes was established; the genomic level of control of the trait is suggested. The role of the relationship of polymorphism at heterochromatic regions of A- and B-chromosomes between them and with the systems of maize reproduction is considered as a mechanism of maintenance of optimum plant heterozygosity via adaptive ontogenetic redistribution of heterochromatin among loci, chromosomes, and gametes.

Journal

Russian Journal of GeneticsSpringer Journals

Published: Oct 7, 2004

References

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