C-Band Heterochromatin and DNA Content in Zea mays

Rayburn, A. Lane; Price, H. James; Smith, J. D.; Gold, John R.

doi:10.2307/2443312

Cited by 100 publications

(70 citation statements)

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“…An association between highly repetitive sequences and heterochromatin has been demonstrated in both animals (John and Miklos, 1979) and plants (Appels, Driscoll and Peacock, 1978;Bedbrook et a!., 1980;Deumling and Greilhuher, 1982). range of flowering plants including Lolium (Thomas, 1981), Secale (Bennett, Gustafson and Smith, 1977), Gibasis karwinskyana (Kenton, 1983) and Zea mays (Rayburn, Price, Smith and Gold, 1985). In Allium, however, there is no correlation between increase in DNA nuclear content and proportion of C-banded material in the karyotype.…”

Section: Dna Contents In Relation To Basic Chromosome Number Polyplomentioning

confidence: 99%

Nuclear DNA variation in the genus Allium L. (Liliaceae)

Labani

Elkington

1987

Heredity

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Section: Dna Contents In Relation To Basic Chromosome Number Polyplomentioning

confidence: 99%

Nuclear DNA variation in the genus Allium L. (Liliaceae)

Labani

Elkington

1987

Heredity

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“…In contrast to the modest variation in gene number, eukaryotic genome size varies over 5 orders of magnitude (4), a paradoxical feature that was noted long before genes were cloned. Even within a single species, that of maize (Zea mays), genome size varies 50% (5). Further, variation in genome size does not follow any taxonomic logic: large genomes are found in some ''simple'' eukaryotic algae and small genomes in advanced organisms.…”

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confidence: 99%

Gene galaxies in the maize genome

Walbot

Petrov

2001

Proc. Natl. Acad. Sci. U.S.A.

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“…The origin of this variation may have other causes, such as difference in genome size, or the particular evolutionary process of the karyotype. In the case of differences in genome size, greater amount of heterochromatin is expected in species with a large genome size than in those with a smaller genome size, a pattern that has been demonstrated in evolutionary closely related organisms (Rayburn et al, 1985;Kao et al, 2001;Bosco et al, 2007). Although this hypothesis is interesting, to date it is not possible to contrast Artemia species, since data is only available for the genome size of A. franciscana, reaching a value of 0.97 pg per haploid genome (De Vos et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…The evidence available on plants and animals indicates that variation in the DNA content per genome, usually positively associated with the increase in the amount of heterochromatin (Rayburn et al, 1985;Kao et al, 2001;Bosco et al, 2007), may produce changes at the cellular (termed nucleotypic effect), or organismal level (Gregory and Hebert, 1999). In other words, the phenotype expression would not just depend on the interaction between genotype and environment, but also on the expression of the DNA quantity, irrespective of its informational content (Swanson et al, 1981;Hartl, 2000).…”

Section: Introductionmentioning

confidence: 99%

Variation of the interphase heterochromatin in Artemia (Crustacea, Anostraca) of the Americas is related to changes in nuclear size and ionic composition of hipersaline habitats

Parraguéz

Gajardo

2017

Braz. J. Biol.

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The populations of Artemia (or brine shrimp) from the Americas exhibit a wide variation in the amount of interphase heterochromatin. There is interest in understanding how this variation affects different parameters, from the cellular to the organismal levels. This should help to clarify the ability of this organism to tolerate brine habitats regularly subject to strong abiotic changes. In this study, we assessed the amount of interphase heterochromatin per nucleus based on chromocenter number (N-CHR) and relative area of chromocenter (R-CHR) in two species of Artemia, A. franciscana (Kellog, 1906) (n=9 populations) and A. persimilis (Piccinelli and Prosdocimi, 1968) (n=3 populations), to investigate the effect on nuclear size (S-NUC). The relationship of the R-CHR parameter with the ionic composition (IC) of brine habitats was also analysed. Our results indicate a significant variation in the amount of heterochromatin both within and between species (ANOVA, p<0.001). The heterochromatin varied from 0.81 ± 1.17 to 12.58 ± 3.78 and from 0.19 ± 0.34% to 11.78 ± 3.71% across all populations, for N-CHR and R-CHR parameters, respectively. N-CHR showed less variation than R-CHR (variation index 15.5-fold vs. 62-fold). At least five populations showed a significant association (p<0.05) between R-CHR and S-NUC, either with negative (four populations, r= from -0.643 to -0.443), or positive (one population, r= 0.367) values.Within each species, there were no significant associations between both parameters (p>0.05). The R-CHR and IC parameters were associated significantly for the magnesium ion (r= 0.496, p<0.05) and also for the chloride, sodium and calcium ions (r = from -0.705 to -0.478, p<0.05). At species level, a significant association between both parameters was also found in A. franciscana populations, for the sulphate and calcium ions, in contrast to A. persimilis. These findings suggest that the amount of interphase heterochromatin modifies the nuclear size in Artemia. Our data also indicate that change in the amount of interphase heterochromatin is in line with the ionic composition of brines. This would be a species-specific phenomenon, whose occurrence may be involved in the ability of this organism to survive in these environments.Keywords: Artemia, interphase heterochromatin, chromocenter, nuclear size, brine ionic composition. Variação da heterocromatina interfásica em Artemia (Crustacea, Anostraca)das Américas está relacionada a mudanças no tamanho nuclear e composição iônica em habitats hipersalinos ResumoAs populações de Artemia (ou camarão de salinas) das Américas apresentam uma grande variação na quantidade de heterocromatina interfásica. Há interesse em compreender como esta variação afeta diferentes parâmetros, desde o nível celular até os organismos. Isso deve ajudar a esclarecer a capacidade destes organismos tolerarem habitats extremos de água hipersalinas, que normalmente são submetidos a fortes mudanças abióticas. Neste estudo, avaliou-se a quantidade heterocromatina interfásica por nú...

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C-Band Heterochromatin and DNA Content in Zea mays

Cited by 100 publications

References 0 publications

Nuclear DNA variation in the genus Allium L. (Liliaceae)

Nuclear DNA variation in the genus Allium L. (Liliaceae)

Gene galaxies in the maize genome

Variation of the interphase heterochromatin in Artemia (Crustacea, Anostraca) of the Americas is related to changes in nuclear size and ionic composition of hipersaline habitats

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