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Registro Completo |
Biblioteca(s): |
Embrapa Milho e Sorgo. |
Data corrente: |
20/01/2006 |
Data da última atualização: |
30/05/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
KOCHIAN, L. V.; PENCE, N. S.; LETHAM, D. L. D.; PINEROS, M. A.; MAGALHAES, J. V.; HOEKENGA, O. A.; GARVIN, D. F. |
Afiliação: |
JURANDIR VIEIRA DE MAGALHAES, CNPMS. |
Título: |
Mechanisms of metal resistance in plants: aluminum and heavy metals. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
Plant and Soil, The Hague, v. 247, n.1 , p. 109-119, 2002. |
Idioma: |
Inglês |
Conteúdo: |
Plants have evolved sophisticated mechanisms to deal with toxic levels of metals in the soil. In this paper, an overview of recent progress with regards to understanding fundamental molecular and physiological mechanisms underlying plant resistance to both aluminium (Al) and heavy metals is presented. The discussion of plant Al resistance will focus on recent advances in our understanding of a mechanism based on Al exclusion from the root apex, which is facilitated by Al-activated exudation of organic acid anions. The consideration of heavy metal resistance will focus on research into a metal hyperaccumulating plant species, the Zn/Cd hyperaccumulator, Thlaspi caerulescens, as an example for plant heavy metal research. Based on the specific cases considered in this paper, it appears that quite different strategies are used for Al and heavy metal resistance. For Al, our current understanding of a resistance mechanism based on excluding soil-borne Al from the root apex is presented. For heavy metals, a totally different strategy based on extreme tolerance and metal hyperaccumulation is described for a hyperaccumulator plant species that has evolved on naturally metalliferous soils. The reason these two strategies are the focus of this paper is that, currently, they are the best understood mechanisms of metal resistance in terrestrial plants. However, it is likely that other mechanisms of Al and/or heavy metal resistance are also operating in certain plant species, and there may be common features shared for dealing with Al and heavy resistance. Future research may uncover a number of novel metal resistance mechanisms in plants. Certainly the complex genetics of Al resistance in some crop plant species, such as rice and maize, suggests that a number of presently unidentified mechanisms are part of an overall strategy of metal resistance in crop plants.. MenosPlants have evolved sophisticated mechanisms to deal with toxic levels of metals in the soil. In this paper, an overview of recent progress with regards to understanding fundamental molecular and physiological mechanisms underlying plant resistance to both aluminium (Al) and heavy metals is presented. The discussion of plant Al resistance will focus on recent advances in our understanding of a mechanism based on Al exclusion from the root apex, which is facilitated by Al-activated exudation of organic acid anions. The consideration of heavy metal resistance will focus on research into a metal hyperaccumulating plant species, the Zn/Cd hyperaccumulator, Thlaspi caerulescens, as an example for plant heavy metal research. Based on the specific cases considered in this paper, it appears that quite different strategies are used for Al and heavy metal resistance. For Al, our current understanding of a resistance mechanism based on excluding soil-borne Al from the root apex is presented. For heavy metals, a totally different strategy based on extreme tolerance and metal hyperaccumulation is described for a hyperaccumulator plant species that has evolved on naturally metalliferous soils. The reason these two strategies are the focus of this paper is that, currently, they are the best understood mechanisms of metal resistance in terrestrial plants. However, it is likely that other mechanisms of Al and/or heavy metal resistance are also operating in certain plant species, and there ma... Mostrar Tudo |
Palavras-Chave: |
Aluminium resistance; Anion channel; Heavy metal transport; Metal hyperaccumulation; Organic acid exudation. |
Thesaurus Nal: |
gene expression. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02660naa a2200265 a 4500 001 1489104 005 2018-05-30 008 2002 bl uuuu u00u1 u #d 100 1 $aKOCHIAN, L. V. 245 $aMechanisms of metal resistance in plants$baluminum and heavy metals.$h[electronic resource] 260 $c2002 520 $aPlants have evolved sophisticated mechanisms to deal with toxic levels of metals in the soil. In this paper, an overview of recent progress with regards to understanding fundamental molecular and physiological mechanisms underlying plant resistance to both aluminium (Al) and heavy metals is presented. The discussion of plant Al resistance will focus on recent advances in our understanding of a mechanism based on Al exclusion from the root apex, which is facilitated by Al-activated exudation of organic acid anions. The consideration of heavy metal resistance will focus on research into a metal hyperaccumulating plant species, the Zn/Cd hyperaccumulator, Thlaspi caerulescens, as an example for plant heavy metal research. Based on the specific cases considered in this paper, it appears that quite different strategies are used for Al and heavy metal resistance. For Al, our current understanding of a resistance mechanism based on excluding soil-borne Al from the root apex is presented. For heavy metals, a totally different strategy based on extreme tolerance and metal hyperaccumulation is described for a hyperaccumulator plant species that has evolved on naturally metalliferous soils. The reason these two strategies are the focus of this paper is that, currently, they are the best understood mechanisms of metal resistance in terrestrial plants. However, it is likely that other mechanisms of Al and/or heavy metal resistance are also operating in certain plant species, and there may be common features shared for dealing with Al and heavy resistance. Future research may uncover a number of novel metal resistance mechanisms in plants. Certainly the complex genetics of Al resistance in some crop plant species, such as rice and maize, suggests that a number of presently unidentified mechanisms are part of an overall strategy of metal resistance in crop plants.. 650 $agene expression 653 $aAluminium resistance 653 $aAnion channel 653 $aHeavy metal transport 653 $aMetal hyperaccumulation 653 $aOrganic acid exudation 700 1 $aPENCE, N. S. 700 1 $aLETHAM, D. L. D. 700 1 $aPINEROS, M. A. 700 1 $aMAGALHAES, J. V. 700 1 $aHOEKENGA, O. A. 700 1 $aGARVIN, D. F. 773 $tPlant and Soil, The Hague$gv. 247, n.1 , p. 109-119, 2002.
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Embrapa Milho e Sorgo (CNPMS) |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
Data corrente: |
28/01/2023 |
Data da última atualização: |
28/01/2023 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
CARVALHO, V. M.; TEIXEIRA, E. M. M.; BRESEGHELLO, F. |
Afiliação: |
VINÍCIUS MACIEL CARVALHO, estagiário CNPAF; ESTER MARQUES MAGALHÃES TEIXEIRA, UNIVERSIDADE FEDERAL DE VIÇOSA; FLAVIO BRESEGHELLO, CNPAF. |
Título: |
Caracterização de acessos de arroz (Oryza sativa L.) através de análise estatística de imagens digitais. |
Ano de publicação: |
2022 |
Fonte/Imprenta: |
In: SEMINÁRIO JOVENS TALENTOS, 16., 2022, Santo Antônio de Goiás. Resumos... Brasília, DF: Embrapa; Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2022. |
Páginas: |
p. 26. |
ISBN: |
978-65-89957-37-9 |
Idioma: |
Português |
Conteúdo: |
Sementes dos acessos do banco de germoplasma de arroz são rotineiramente fotografadas para registro no sistema Alelo. A caracterização dos acessos permite melhor compreensão sobre o acervo e facilita o uso dos recursos genéticos no melhoramento. Foi desenvolvido um novo método para obter valores numéricos de descritores morfológicos dos grãos, pela análise estatística das fotografias digitais, no ambiente R. Com o objetivo de validar o novo método, comparamos dados de comprimento e largura dos grãos de uma amostra composta de cinco sementes representativas de dez acessos morfologicamente contrastantes, obtidos com paquímetro e com a análise de imagens. |
Palavras-Chave: |
Imagem digital. |
Thesagro: |
Análise Estatística; Arroz; Oryza Sativa; Recurso Genético; Semente. |
Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1151333/1/sjt-p26.pdf
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Marc: |
LEADER 01473nam a2200229 a 4500 001 2151333 005 2023-01-28 008 2022 bl uuuu u00u1 u #d 020 $a978-65-89957-37-9 100 1 $aCARVALHO, V. M. 245 $aCaracterização de acessos de arroz (Oryza sativa L.) através de análise estatística de imagens digitais.$h[electronic resource] 260 $aIn: SEMINÁRIO JOVENS TALENTOS, 16., 2022, Santo Antônio de Goiás. Resumos... Brasília, DF: Embrapa; Santo Antônio de Goiás: Embrapa Arroz e Feijão$c2022 300 $ap. 26. 520 $aSementes dos acessos do banco de germoplasma de arroz são rotineiramente fotografadas para registro no sistema Alelo. A caracterização dos acessos permite melhor compreensão sobre o acervo e facilita o uso dos recursos genéticos no melhoramento. Foi desenvolvido um novo método para obter valores numéricos de descritores morfológicos dos grãos, pela análise estatística das fotografias digitais, no ambiente R. Com o objetivo de validar o novo método, comparamos dados de comprimento e largura dos grãos de uma amostra composta de cinco sementes representativas de dez acessos morfologicamente contrastantes, obtidos com paquímetro e com a análise de imagens. 650 $aAnálise Estatística 650 $aArroz 650 $aOryza Sativa 650 $aRecurso Genético 650 $aSemente 653 $aImagem digital 700 1 $aTEIXEIRA, E. M. M. 700 1 $aBRESEGHELLO, F.
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