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Ullman JS, Lima-de-Faria A, Jaworska H, Bryngelsson T. Amplification of ribosomal DNA in Acheta. V. Hybridization of RNA complementary to ribosomal DNA with pachytene chromosomes. Hereditas 2009; 74:13-24. [PMID: 4586186 DOI: 10.1111/j.1601-5223.1973.tb01100.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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Ståhle U, Lima-de-Faria A, Ghatnekar R, Jaworska H, Manley M. Satellite DNA, localization of ribosomal cistrons and heterochromatin in Haplopappus gracilis. Hereditas 2009; 79:21-8. [PMID: 1165208 DOI: 10.1111/j.1601-5223.1975.tb01458.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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Lima-de-Faria A, Pero R, Avanzi S, Durante M, Ståhle U, D'Amato F, Granström H. Relation between ribosomal RNA genes and the DNA satellites of Phaseolus coccineus. Hereditas 2009; 79:5-20. [PMID: 1165210 DOI: 10.1111/j.1601-5223.1975.tb01457.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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BASSI PAOLA. QUANTITATIVE VARIATIONS OF NUCLEAR DNA DURING PLANT DEVELOPMENT: A CRITICAL ANALYSIS. Biol Rev Camb Philos Soc 2008. [DOI: 10.1111/j.1469-185x.1990.tb01424.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Guerra M. Fluorescent in situ hybridization in plant polytene chromosomes. METHODS IN CELL SCIENCE : AN OFFICIAL JOURNAL OF THE SOCIETY FOR IN VITRO BIOLOGY 2002; 23:133-8. [PMID: 11741150 DOI: 10.1007/978-94-010-0330-8_13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Polytene chromosomes are found in specialized tissues, with high metabolic activity, of a few angiosperm genera. They differ from Diptera polytenics in several aspects, mainly because their chromatids on each chromosome are not tightly paired, nor are they so highly endoreplicated as those of Diptera. In situ hybridization with isotopic and non-isotopic probes has been successfully used in plant polytene chromosomes, mainly in Phaseolus coccineus and Vigna unguiculata, where they have been best investigated. The results reported for mitotic and polytene chromosomes of these species, and a few others, are compared aiming to ascertain the efficiency and limitations of FISH in plant polytenics. In general, polytene chromosomes either from embryo suspensor cells of P. coccineus or from anther tapetal cells of V. unguiculata proved to be quite a suitable system for localizing DNA sequences by FISH. The partially unsynapsed chromatids, typically found in plant polytenics, seem to be the most important hindrance for a precise chromosome mapping. On the other hand, the interphase polytene nucleus is a valuable system for localizing FISH signals since they conserve a spatial organization similar to that of mitotic interphase and produce much amplified signals.
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Affiliation(s)
- M Guerra
- Department of Botany, Federal University of Pernambuco, Recife, Brazil.
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Affiliation(s)
- I F Zhimulev
- Institute of Cytology and Genetics, Siberian Division of Russian Academy of Sciences, Novosibirsk, Russia
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Affiliation(s)
- I F Zhimulev
- Institute of Cytology and Genetics, Siberian Division of Russian Academy of Sciences, Novosibirsk, Russia
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Nagl W. Polytene Chromosomes of Plants. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/s0074-7696(08)61285-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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Grilli I, Anguillesi M, Floris C, Lorenzini N, Meletti P. Effects of GA3 treatment on the synthesis of poly(A)-rich RNA in wheat dormant embryos. ACTA ACUST UNITED AC 1980. [DOI: 10.1016/s0015-3796(80)80012-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Broekaert D, van Parijs R. The Relationship between the Endomitotic Cell Cycle and the Enhanced Capacity for Protein Synthesis in Leguminosae Embryogeny. ACTA ACUST UNITED AC 1978. [DOI: 10.1016/s0044-328x(78)80096-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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14
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Maggini F, Barsanti P, Marazia T. Individual variation of the nucleolus organizer regions in Allium cepa and A. sativum. Chromosoma 1978. [DOI: 10.1007/bf00295138] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Durante M, Cionini PG, Avanzi S, Cremonini R, D'Amato F. Cytological localization of the genes for the four classes of ribosomal RNA (25S, 18S, 5.8S and 5S) in polytene chromosomes of Phaseolus coccineus. Chromosoma 1977; 60:269-82. [PMID: 858263 DOI: 10.1007/bf00329775] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Homologous tritiated 25S, 18S and 5.8S rRNAs were used separately for in situ hybridization to the polytene chromosomes of the embryo suspensor cells of phaseolus coccineus. Hybridization occurred at the same chromosomal sites which were labeled in previous in situ hybridization experiments with 25 + 18S rRNAs in the same material (Avanzi et al., 1972), namely: nucleolus organizing system (satellite, nucleolar constriction and organizer) of chromosome pairs I (S1) and V (S2), proximal heterochromatic segment of the long arm of chromosome pair I, and terminal heterochromatic segment of chromosome pair II. Competition hybridization experiments confirmed for P. coccineus the high sequence homology between 25S and 18S rRNA already known for other plants. Homologous 125I-5S rRNA was found to hybridize to three sites in the polytene chromosomes of P. coccineus: the proximal heterochromatic segment in the long arm of chromosome pair I (which also bears the sequences complementary to 25S, 18S and 5.8S RNAs), most of the proximal heterochromatic segment plus a small portion of adjoining euchromatin in the long arm of chromosome pair VI and the large intercalary heterochromatic segment in the same chromosome pair. Simultaneous labeling of the two 5S RNA sites in chromosome VI was quite rare (3%), the rule being labelling of one site to the exclusion of the other, with a labeling frequency of 43.7% and 53.3% for sites no. 1 and no. 2 respectively. These results are interpreted as being due to differential hybridizability of chromosomal sites such as described in other materials.
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Kn�lmann M, Burger EC. Cytologische Lokalisation von 5S und 18/25S RNA Genorten in Mitose-Chromosomen von Vicia faba. Chromosoma 1977. [DOI: 10.1007/bf00327399] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Forino LMC, Cremonini R, Tagliasacchi AM. Frequenza di cellule con « DNA puffs » nel sospensore di Phaseolus coccineus in momenti diversi dello sviluppo embrionale. ACTA ACUST UNITED AC 1976. [DOI: 10.1080/11263507609433028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Abstract
Most cells of the male PTK2 cell line contain one nucleolus, and they are diploid. However, a proportion of cells have more than one nucleolus. Cells with two and three nucleoli were isolated and cloned into viable populations. Greater than 90% of the cells in these clonal populations maintained the abnormal nucleolar number of the originally isolated cell. Karyotype analysis of cells with two and three nucleoli demonstrated that the cells were respectively tetraploid and hexaploid. It was concluded that in PTK2 cells, nucleolarity is a good index of ploidy even if the ploidy level is abnormal. Furthermore, long term monitoring of the tetraploid cells demonstrated virtually no tendency towards reversion to the diploid condition as suggested by other studies in Potorous.
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Kano Y, Maeda S, Sugiyama T. The location of ribosomal cistrons (rDNA) in chromosomes of the rat. Chromosoma 1976; 55:37-42. [PMID: 1253647 DOI: 10.1007/bf00288325] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In situ hybridization of 3H-labelled ribosomal RNA to the chromosomes of rat bone marrow cells revealed that clusters of ribosomal cistrons (rDNA) are located in the secondary constrictions of chromosomes No. 3 and 12 and near the centromere of chromosome No. 11, both associated with the late DNA-replicating regions. They were not found in Nos. 1, 2, 13, 19, 20, and the Y chromosome.
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Alpi A, Tognoni F, D'Amato F. Growth regulator levels in embryo and suspensor of Phaseolus coccineus at two stages of development. PLANTA 1975; 127:153-162. [PMID: 24430372 DOI: 10.1007/bf00388376] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/1975] [Accepted: 07/25/1975] [Indexed: 06/03/2023]
Abstract
Gibberellins and auxins were extracted from embryos and suspensors of Phaseolus coccineus L. at two stages of development: A) heart-shaped embryo and B) cotyledonary embryo with suspensor in the initial stage of degeneration. The time interval between the two stages was 5-6 days.In both embryos and suspensors, gibberellin (GA)-like activity was found in three fractions: F-1 (ethyl acetate fraction at pH 8.0), F-2 (free GAs) and F-3 (bound GAs). At stage A, the total GA activity in the suspensor was about 30 times greater than in the embryo and the bound GAs contributed by about 90% to the total GA content. A dramatic decrease in level of bound GA-like substances was found in suspensors at stage B, when the level of total GAs in the embryo had increased to 10 times that at stage A. This might suggest a transport of GAs from the suspensor to the embryo. In both embryo and suspensor, qualitative changes in GAs with shift in activity of the fractions tested occurred at the two developmental stages.The methanolic extracts of stage A suspensors showed two inhibitors, one much more active than the other, and two large peaks of growth promoting activity at Rf 0.4-0.7; in stage A embryos, the general activity of the extracts was lower and the promoting effect was spread over Rf 0.3-0.9.The present results seem to support the view that the suspensor plays a role in embryogenesis by acting as a site of synthesis of growth regulators needed by the embryo.
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Affiliation(s)
- A Alpi
- Istituto di Orticoltura della Università, 56100, Pisa, Italy
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Parenti R, Guillé E, Grisvard J, Durante M, Giorgi L, Buiatti M. Transient DNA satellite in dedifferentiating pith tissue. NATURE: NEW BIOLOGY 1973; 246:237-9. [PMID: 4519611 DOI: 10.1038/newbio246237a0] [Citation(s) in RCA: 44] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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