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Heterochromatic Regions of Maize A- and B-Chromosomes

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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.

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  1. Institute of Cytology and Genetics, Russian Academy of Sciences, Novosibirsk, 630090, Russia

    G. A. Pokhmelnykh & V. K. Shumny

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  1. G. A. Pokhmelnykh
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  2. V. K. Shumny
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Pokhmelnykh, G.A., Shumny, V.K. Heterochromatic Regions of Maize A- and B-Chromosomes. Russian Journal of Genetics 39, 1035–1042 (2003). https://doi.org/10.1023/A:1025727218430

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