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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
22/10/1997 |
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Data da última atualização: |
01/03/2017 |
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Autoria: |
RODRIGUES, G. S.; MA, T.; PIMENTEL, D.; WEINSTEIN, L. H. |
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Afiliação: |
GERALDO STACHETTI RODRIGUES, CNPMA; TE-HSIU MA, WESTERN ILLINOIS UNIVERSITY; DAVID PIMENTEL, CORNELL UNIVERSITY/NY; LEONARD H. WEINSTEIN, BOYCE THOMPSON INSTITUTE FOR PLANT RESEARCH/NY. |
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Título: |
Tradescantia bioassays as monitoring systems for environmental mutagenesis: a review. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Critical Reviews in Plant Sciences, v.16, n.4, p.325-359, 1997. |
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Idioma: |
Inglês |
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Conteúdo: |
Since the early studies on the genetic effects of chemical and physical agents, species and clones of Tradescantia have been used as experimental subjects, by virtue of a series of favorable genetic characteristics. Bearing just six pairs (2n = 12) of large, easily observable chromosomes, cells from almost every part of the plant, from the root tips to the developing pollen tube, yield excellent material for cytogenetic studies. As a consequence of the intensive use of Tradescantia in genetic studies, a series of genetic characteristics have been found that offer opportunities for the detection of agents affecting the stability of the genome. At least five such characteristics have been selected as endpoints for the establishment of assays to evaluate mutagenesis. Three of these, root-tip mitosis, pollen-tube, and microspore mitosis are essentially chromosome aberration assays, wherein one observes and evaluates the visible damage in the chromosomes. A fourth, the stamen-hair mutation assay (Trad-SHM), is a point mutation mitotic assay based on the expression of a recessive gene for flower color in heterozygous plants. The fifth assay is a cytogenetic test based on the formation of micronuclei (Trad-MCN) that result from chromosome breakage in the meiotic pollen mother cells. This article examines the characteristics and fundamentals of the Trad-MCN and the Trad-SHM assays and reviews the results obtained to date with these systems in the assessment of environmental mutagenesis. MenosSince the early studies on the genetic effects of chemical and physical agents, species and clones of Tradescantia have been used as experimental subjects, by virtue of a series of favorable genetic characteristics. Bearing just six pairs (2n = 12) of large, easily observable chromosomes, cells from almost every part of the plant, from the root tips to the developing pollen tube, yield excellent material for cytogenetic studies. As a consequence of the intensive use of Tradescantia in genetic studies, a series of genetic characteristics have been found that offer opportunities for the detection of agents affecting the stability of the genome. At least five such characteristics have been selected as endpoints for the establishment of assays to evaluate mutagenesis. Three of these, root-tip mitosis, pollen-tube, and microspore mitosis are essentially chromosome aberration assays, wherein one observes and evaluates the visible damage in the chromosomes. A fourth, the stamen-hair mutation assay (Trad-SHM), is a point mutation mitotic assay based on the expression of a recessive gene for flower color in heterozygous plants. The fifth assay is a cytogenetic test based on the formation of micronuclei (Trad-MCN) that result from chromosome breakage in the meiotic pollen mother cells. This article examines the characteristics and fundamentals of the Trad-MCN and the Trad-SHM assays and reviews the results obtained to date with these systems in the assessment of environmental mutagene... Mostrar Tudo |
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Palavras-Chave: |
Atmospheric pollutants; Bioindicator; Soil contaminants. |
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Thesaurus Nal: |
genotoxicity; remediation; soil amendments; water pollution. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/156787/1/1997AP044-Rodrigues-Tradescantia-3350.pdf
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Marc: |
LEADER 02209naa a2200241 a 4500
001 1012754
005 2017-03-01
008 1997 bl uuuu u00u1 u #d
100 1 $aRODRIGUES, G. S.
245 $aTradescantia bioassays as monitoring systems for environmental mutagenesis$ba review.$h[electronic resource]
260 $c1997
520 $aSince the early studies on the genetic effects of chemical and physical agents, species and clones of Tradescantia have been used as experimental subjects, by virtue of a series of favorable genetic characteristics. Bearing just six pairs (2n = 12) of large, easily observable chromosomes, cells from almost every part of the plant, from the root tips to the developing pollen tube, yield excellent material for cytogenetic studies. As a consequence of the intensive use of Tradescantia in genetic studies, a series of genetic characteristics have been found that offer opportunities for the detection of agents affecting the stability of the genome. At least five such characteristics have been selected as endpoints for the establishment of assays to evaluate mutagenesis. Three of these, root-tip mitosis, pollen-tube, and microspore mitosis are essentially chromosome aberration assays, wherein one observes and evaluates the visible damage in the chromosomes. A fourth, the stamen-hair mutation assay (Trad-SHM), is a point mutation mitotic assay based on the expression of a recessive gene for flower color in heterozygous plants. The fifth assay is a cytogenetic test based on the formation of micronuclei (Trad-MCN) that result from chromosome breakage in the meiotic pollen mother cells. This article examines the characteristics and fundamentals of the Trad-MCN and the Trad-SHM assays and reviews the results obtained to date with these systems in the assessment of environmental mutagenesis.
650 $agenotoxicity
650 $aremediation
650 $asoil amendments
650 $awater pollution
653 $aAtmospheric pollutants
653 $aBioindicator
653 $aSoil contaminants
700 1 $aMA, T.
700 1 $aPIMENTEL, D.
700 1 $aWEINSTEIN, L. H.
773 $tCritical Reviews in Plant Sciences$gv.16, n.4, p.325-359, 1997.
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Registro original: |
Embrapa Meio Ambiente (CNPMA) |
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| 2. |  | FIDALSKI, J.; TORMENA, C. A.; CECATO, U.; BARBERO, L. M.; LUGÃO, S. M. B.; COSTA, MA. T. Qualidade física do solo em pastagem adubada e sob pastejo contínuo. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 43, n. 11, p. 1583-1590, nov. 2008. Título em ingles: Soil physical quality in a fertilized pasture under continuous grazin.| Biblioteca(s): Embrapa Unidades Centrais. |
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