Characterization of eight species of Aloe (Asphodelaceae) from the nucleolar organizing region
Abstract Nucleolar organizing region of eight species of Aloe was analyzed in somatic metaphases and interphase nuclei. All species showed a uniform 2n=14, with eight large chromosomes and six small chromosomes. Satellites were observed on the long arm of one or two pairs of large chromosomes and/or...
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| Published in | Rodriguésia Vol. 69; no. 2; pp. 363 - 372 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English Portuguese |
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Instituto de Pesquisas Jardim Botânico do Rio de Janeiro
01.06.2018
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| Abstract | Abstract Nucleolar organizing region of eight species of Aloe was analyzed in somatic metaphases and interphase nuclei. All species showed a uniform 2n=14, with eight large chromosomes and six small chromosomes. Satellites were observed on the long arm of one or two pairs of large chromosomes and/or on the short arm of one of the small pairs. The silver-stained nucleolus organizing regions were located on the subtelomeric region of the long arm of one or two pairs of large chromosomes, except for Aloe dichotoma and Aloe maculata, which the AgNORs were located at a short arm of one of their small chromosomes. In most studied species, the active AgNOR number was four. However, this number changing from one to eight. For all species, the interphase number of nucleoli can be one or two, while, in Aloe excelsa, this number can be changing from one to eight. Polymorphism of active AgNORs and the number of interphase nucleoli were revealed, except for Aloe petricola, which active AgNORs were located only in the subtelomeric regions at the long arm of one of the L2 chromosomes, as well as in the L4 pair, which is agrément with the maximum number (three) of interphase nucleoli.
Resumo A região organizadora nucléica de oito espécies de Aloe foi analisada em metáfases somáticas e núcleos interfásicos. Todas as espécies apresentaram um número uniforme de 2n = 14, com oito cromossomos grandes e seis pequenos. Satélites foram observados no braço longo de um ou dois pares de cromossomos grandes e/ou no braço curto de um dos pares pequenos. As regiões organizadoras del nucléolo coradas com prata estavam localizadas na região subtelomérica do braço longo de um ou dois pares dos cromossomos grandes, exceto en Aloe dichotoma e Aloe maculata, em que os AgNORs estavan localizados em um braço curto de um de seus cromossomos pequenos. Na maioria das espécies estudadas, o número ativo de AgNOR era quatro. No entanto, esse número muda de um para oito. Para todas as espécies, o número de nucléolos na interfase pode ser um ou dois, enquanto, em Aloe excelsa, esse número pode estar mudando de um a oito. Polimorfismo de AgNORs ativos e o número de nucléolos em interfase foram revelados, exceto Aloe petricola, cujos AgNORs ativos estavam localizados apenas nas regiões subteloméricas no braço longo um dos cromossomos L2, bem como no par L4, concordando com o número máximo (três) de nucléolos em interfase. |
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| AbstractList | Abstract Nucleolar organizing region of eight species of Aloe was analyzed in somatic metaphases and interphase nuclei. All species showed a uniform 2n=14, with eight large chromosomes and six small chromosomes. Satellites were observed on the long arm of one or two pairs of large chromosomes and/or on the short arm of one of the small pairs. The silver-stained nucleolus organizing regions were located on the subtelomeric region of the long arm of one or two pairs of large chromosomes, except for Aloe dichotoma and Aloe maculata, which the AgNORs were located at a short arm of one of their small chromosomes. In most studied species, the active AgNOR number was four. However, this number changing from one to eight. For all species, the interphase number of nucleoli can be one or two, while, in Aloe excelsa, this number can be changing from one to eight. Polymorphism of active AgNORs and the number of interphase nucleoli were revealed, except for Aloe petricola, which active AgNORs were located only in the subtelomeric regions at the long arm of one of the L2 chromosomes, as well as in the L4 pair, which is agrément with the maximum number (three) of interphase nucleoli. Abstract Nucleolar organizing region of eight species of Aloe was analyzed in somatic metaphases and interphase nuclei. All species showed a uniform 2n=14, with eight large chromosomes and six small chromosomes. Satellites were observed on the long arm of one or two pairs of large chromosomes and/or on the short arm of one of the small pairs. The silver-stained nucleolus organizing regions were located on the subtelomeric region of the long arm of one or two pairs of large chromosomes, except for Aloe dichotoma and Aloe maculata, which the AgNORs were located at a short arm of one of their small chromosomes. In most studied species, the active AgNOR number was four. However, this number changing from one to eight. For all species, the interphase number of nucleoli can be one or two, while, in Aloe excelsa, this number can be changing from one to eight. Polymorphism of active AgNORs and the number of interphase nucleoli were revealed, except for Aloe petricola, which active AgNORs were located only in the subtelomeric regions at the long arm of one of the L2 chromosomes, as well as in the L4 pair, which is agrément with the maximum number (three) of interphase nucleoli. Resumo A região organizadora nucléica de oito espécies de Aloe foi analisada em metáfases somáticas e núcleos interfásicos. Todas as espécies apresentaram um número uniforme de 2n = 14, com oito cromossomos grandes e seis pequenos. Satélites foram observados no braço longo de um ou dois pares de cromossomos grandes e/ou no braço curto de um dos pares pequenos. As regiões organizadoras del nucléolo coradas com prata estavam localizadas na região subtelomérica do braço longo de um ou dois pares dos cromossomos grandes, exceto en Aloe dichotoma e Aloe maculata, em que os AgNORs estavan localizados em um braço curto de um de seus cromossomos pequenos. Na maioria das espécies estudadas, o número ativo de AgNOR era quatro. No entanto, esse número muda de um para oito. Para todas as espécies, o número de nucléolos na interfase pode ser um ou dois, enquanto, em Aloe excelsa, esse número pode estar mudando de um a oito. Polimorfismo de AgNORs ativos e o número de nucléolos em interfase foram revelados, exceto Aloe petricola, cujos AgNORs ativos estavam localizados apenas nas regiões subteloméricas no braço longo um dos cromossomos L2, bem como no par L4, concordando com o número máximo (três) de nucléolos em interfase. |
| Author | Raymúndez, María B. Imery, José Acosta, M. Cristina Sánchez-G, Ysbelia Moscone, Eduardo |
| AuthorAffiliation | Universidad Nacional de Córdoba Universidad Nacional Experimental del Táchira Universidad de Oriente Universidad Pedagógica Experimental Libertador Universidad Central de Venezuela |
| AuthorAffiliation_xml | – name: Universidad de Oriente – name: Universidad Nacional Experimental del Táchira – name: Universidad Central de Venezuela – name: Universidad Pedagógica Experimental Libertador – name: Universidad Nacional de Córdoba |
| Author_xml | – sequence: 1 givenname: Ysbelia surname: Sánchez-G fullname: Sánchez-G, Ysbelia organization: Universidad Nacional Experimental del Táchira, Venezuela; Universidad Pedagógica Experimental Libertador, Venezuela – sequence: 2 givenname: María B. surname: Raymúndez fullname: Raymúndez, María B. organization: Universidad Central de Venezuela, Venezuela – sequence: 3 givenname: José surname: Imery fullname: Imery, José organization: Universidad de Oriente, Venezuela – sequence: 4 givenname: M. Cristina surname: Acosta fullname: Acosta, M. Cristina organization: Universidad Nacional de Córdoba, Argentina – sequence: 5 givenname: Eduardo surname: Moscone fullname: Moscone, Eduardo organization: Universidad Nacional de Córdoba, Argentina |
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| Keywords | AgNORs bandeamento de prata silver-banding atividade nucleolar Aloe nucleolar activity |
| Language | English Portuguese |
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| Snippet | Abstract Nucleolar organizing region of eight species of Aloe was analyzed in somatic metaphases and interphase nuclei. All species showed a uniform 2n=14,... |
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| SubjectTerms | AgNORs Aloe atividade nucleolar bandeamento de prata ECOLOGY PLANT SCIENCES |
| Title | Characterization of eight species of Aloe (Asphodelaceae) from the nucleolar organizing region |
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