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Journal ArticleDOI

Feulgen microspectrophotometric estimation of nuclear DNA of species and varieties of three different genera of Marantaceae

01 Jul 1984-Vol. 93, Iss: 3, pp 337-347
TL;DR: The variation in 4C DNA amounts between the species of Calathea was not distinct but in two species of Maranta, a notable variation in nuclear DNA amount was recorded and the amount of nuclear DNA did not show direct correlation with the total chromosome length and volume.
Abstract: Karyological analysis including determination of somatic chromosome number, total chromosome length, volume and karyotype formula andin situ estimation of 4C-nuclear DNA amount were carried out on 14 different species and varieties of the generaCalathea, Maranta andStromanthe. The 4C nuclear DNA amount was estimated through Feulgen microspectrophotometry following single wavelength method and expressed in arbitrary units of relative absorbances. The variation in 4C DNA amounts between the species ofCalathea was not distinct but in two species ofMaranta, a notable variation in nuclear DNA amount was recorded. In addition, the amount of nuclear DNA did not show direct correlation with the total chromosome length and volume. The absence of wide difference in nuclear DNA content at an interspecific level might have some adaptive value.
Citations
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Journal ArticleDOI
27 Feb 2016-Nucleus
TL;DR: The species and varieties of Tabernaemontana have distinct total chromosome length, volume and nuclear DNA contents, and karyotype analysis showed differences in chromosome types and number of chromosome in each type.
Abstract: Tabernaemontana coronaria, a common garden plant in tropical countries, has been used as a traditional medicine. The beneficial properties of T. coronaria are antioxidant and anti-inflammatory. The active biocompounds including the alkaloids in the leaf extract enhance the cholinergic activity in both central and peripheral nervous system. A detailed analysis of morphological and cytological characters was carried out on three varieties and populations of T. coronaria and one population of T. dichotoma. Morphological characters like inter-node length, petiole length, leaf area and leaf index differed in species and varieties which may serve as identifying characters. Somatic chromosome analysis revealed 2n = 22 chromosomes in T. dichotoma, T. coronaria var. variegata, T. coronaria var. Dwarf, T. coronaria and 2n = 3X = 33 chromosomes in T. coronaria var. Flore-pleno with 2n = 3X = 33 being triploid. The species and varieties of Tabernaemontana have distinct total chromosome length, volume and nuclear DNA contents. Karyotype analysis showed differences in chromosome types and number of chromosome in each type. A conspicuous variation in chromosome characteristics was observed at intra specific and intra varietal level.

1 citations


Cites background from "Feulgen microspectrophotometric est..."

  • ...This indicated the possible role of differential condensation of the chromatin and association of both histone and nonhistone proteins [8, 9, 21]....

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  • ...DNA varies even between closely related species within the same genus from three to six fold [4, 21]....

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Journal ArticleDOI
TL;DR: In this article , the 2n chromosome number of nine species and measure the nuclear 2C value of 23 species representing eight genera of Marantaceae were reported for the first time, and they reinforce that polyploidy play an important role in the interspecific variation of chromosome number and/or nuclear genome size in MARANTaceae and that these genomic changes influence diversification and speciation in this family.
References
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Journal ArticleDOI
17 Apr 1980-Nature
TL;DR: Natural selection operating within genomes will inevitably result in the appearance of DNAs with no phenotypic expression whose only ‘function’ is survival within genomes.
Abstract: Natural selection operating within genomes will inevitably result in the appearance of DNAs with no phenotypic expression whose only ‘function’ is survival within genomes. Prokaryotic transposable elements and eukaryotic middle-repetitive sequences can be seen as such DNAs, and thus no phenotypic or evolutionary function need be assigned to them.

1,694 citations


"Feulgen microspectrophotometric est..." refers background in this paper

  • ...The function of sucia repeated sequences has been differently interpreted by vai authors (Jacq et al 1977; Strobel et al 1979; Brown and Dover 1979; Doolittle and Sapienza 1980; Orgel et al 1980; Zuckerkandel 1980; David et al 1981)....

    [...]

Journal ArticleDOI
05 Mar 1981-Nature
TL;DR: Eight classes of human leukocyte interferon cDNA clones have been identified in a cDNA library prepared from a myeloblastoid cell line and nucleotide sequences demonstrate that the multiple human LeIFN genes code for a family of homologous, yet distinct proteins.
Abstract: Eight classes of human leukocyte interferon (LeIFN) cDNA clones have been identified in a cDNA library prepared from a myeloblastoid cell line. The nucleotide sequences demonstrate that the multiple human LeIFN genes code for a family of homologous, yet distinct proteins. One of the cDNA clones may have been derived from the transcription of a LeIFN pseudogene.

524 citations

Journal ArticleDOI
17 Jun 1976-Nature
TL;DR: A relationship between the basic nuclear DNA content and the occurrence and degree of endopolyploidy is reported and strongly suggests that DNA endoreduplication can be regarded as an evolutionary alternative to the high nuclearDNA content that has been achieved in other species mainly by ‘saltatory replications’.
Abstract: DNA endoreduplication and related phenomena (such as endomitosis, polyteny, nuclear restitution and somatic polyploidy in general) are widespread over the animal and plant kingdoms, although they occur most frequently among insects and angiosperms1–3. The systematic restriction to certain phyla and species has been interpreted in terms of high genetic control of such events3, whereas the characteristic developmental pattern of various degrees of endopolyploidy has been considered as an expression of their functional role in differentiation and synthesising capacity of the cells2,4,5. Recently,however, any role of endoreduplication in cell differentiation has been questioned because of the existence of species apparently lacking endopolyploidy6. All previous discussions on endoreduplication, endopolyploidy and polyteny have, however, ignored the basic DNA contents of the species studied. We here report a relationship between the basic nuclear DNA content and the occurrence and degree of endopolyploidy. This strongly suggests that DNA endoreduplication can be regarded as an evolutionary alternative to the high nuclear DNA content that has been achieved in other species mainly by ‘saltatory replications’.

233 citations

Journal ArticleDOI
01 Jun 1979-Cell
TL;DR: The results indicate that 412, copia and 297 are capable of evolutionarily rapid transpositions to new chromosomal sites and are able to be passed on from D. melanogaster strains to individuals from the same laboratory stock.

204 citations

Journal ArticleDOI
TL;DR: A chronology of key events, events, and researchers’ observations that led to the establishment of the “six letters” structure of DNA in 1953 and its replacement by the four “letter T”s since then.
Abstract: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Range of Variability of DNA Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 DNA Variation in Higher Plants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Gymnosperms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Angiosperms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Mechanisms of Change in DNA Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Cellular and Organismic Correlations with DNA Content . . . . . . . . . . . . . . . . . . . . . . . . 40 Functions of DNA Sequences Duplicated or Deleted during Evolution . . . . . . . . . . . . . 41 Prospects for Future Research . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Literature Cited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

182 citations