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Registro Completo |
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Biblioteca(s): |
Embrapa Agropecuária Oeste; Embrapa Cerrados. |
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Data corrente: |
15/08/1996 |
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Data da última atualização: |
10/09/1997 |
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Autoria: |
ANDRADE, L. R. M. de. |
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Título: |
Physiological studies on varietal differences in aluminum tolerance in wheat. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
[Fukuoka, Japan]: [Kyushu University], 1996. |
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Páginas: |
131p. |
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Idioma: |
Inglês |
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Notas: |
[Tese Doutorado]. |
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Conteúdo: |
Differential Al-tolerance in plants, particularly wheat varieties has been extensively studied, but the mechanisms of Al toxicity and tolerance are still not well understood. The objective of this work was to investigate the mechanisms of Al-tolerance in wheat varieties screened for Al-tolerance by the hematoxylin staining method, with emphasis on a) the formation of a plant-induced pH barrier in the rhizosphere and b) the exudation of chelator ligands. A second objective was to clarify the effect of Al on the metabolism of malate in roots leading to its excretion using 14C tracer technique. Selected six wheat varieties differing in Al tolerance were used to determine the combined effects of Al and N sources on solution pH changes and nutrient absorption by plants. NO3- uptake was severely inhibited by the presence of Al while NH4+ uptake was little affected. Al decreased the amounts of Ca, Mg, and K accumulated in whole plants independent of N sources. The changes in the solution pH were a consequence of general effect of Al on nutrient uptake, msinly N (NH4+ and N03-), and they were not directly correlated with the scoring of Al-tolerance. Plants grown in N03--N accumulated more Al in the roots and it might be related to solution pH-changes. Tolerant varieties accumulated less Al. It was concluded the differential Al-tolerance among those varieties could not be explained solely by the ability of plants to maintain a high solution pH in mixed N solutions. The root apex (root cap, meristem, and root elongation ... MenosDifferential Al-tolerance in plants, particularly wheat varieties has been extensively studied, but the mechanisms of Al toxicity and tolerance are still not well understood. The objective of this work was to investigate the mechanisms of Al-tolerance in wheat varieties screened for Al-tolerance by the hematoxylin staining method, with emphasis on a) the formation of a plant-induced pH barrier in the rhizosphere and b) the exudation of chelator ligands. A second objective was to clarify the effect of Al on the metabolism of malate in roots leading to its excretion using 14C tracer technique. Selected six wheat varieties differing in Al tolerance were used to determine the combined effects of Al and N sources on solution pH changes and nutrient absorption by plants. NO3- uptake was severely inhibited by the presence of Al while NH4+ uptake was little affected. Al decreased the amounts of Ca, Mg, and K accumulated in whole plants independent of N sources. The changes in the solution pH were a consequence of general effect of Al on nutrient uptake, msinly N (NH4+ and N03-), and they were not directly correlated with the scoring of Al-tolerance. Plants grown in N03--N accumulated more Al in the roots and it might be related to solution pH-changes. Tolerant varieties accumulated less Al. It was concluded the differential Al-tolerance among those varieties could not be explained solely by the ability of plants to maintain a high solution pH in mixed N solutions. The root apex (roo... Mostrar Tudo |
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Palavras-Chave: |
Aluminium; Diferenca varietal; Difference; Malato; Mecanismo; Mechanism; Organic acids; Plant soil relations; Soil deficiencies; Soil toxity; Tolerance; Tolerancia; Toxicidade. |
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Thesagro: |
Ácido Orgânico; Alumínio; Fisiologia Vegetal; Raiz; Relação Solo-Planta; Rizosfera; Toxidez; Trigo; Triticum Aestivum; Variedade. |
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Thesaurus Nal: |
aluminum; malates; plant physiology; rhizosphere; roots; toxicity; varieties; wheat. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02787nam a2200505 a 4500
001 1557073
005 1997-09-10
008 1996 bl uuuu m 00u1 u #d
100 1 $aANDRADE, L. R. M. de
245 $aPhysiological studies on varietal differences in aluminum tolerance in wheat.
260 $a[Fukuoka, Japan]: [Kyushu University]$c1996
300 $a131p.
500 $a[Tese Doutorado].
520 $aDifferential Al-tolerance in plants, particularly wheat varieties has been extensively studied, but the mechanisms of Al toxicity and tolerance are still not well understood. The objective of this work was to investigate the mechanisms of Al-tolerance in wheat varieties screened for Al-tolerance by the hematoxylin staining method, with emphasis on a) the formation of a plant-induced pH barrier in the rhizosphere and b) the exudation of chelator ligands. A second objective was to clarify the effect of Al on the metabolism of malate in roots leading to its excretion using 14C tracer technique. Selected six wheat varieties differing in Al tolerance were used to determine the combined effects of Al and N sources on solution pH changes and nutrient absorption by plants. NO3- uptake was severely inhibited by the presence of Al while NH4+ uptake was little affected. Al decreased the amounts of Ca, Mg, and K accumulated in whole plants independent of N sources. The changes in the solution pH were a consequence of general effect of Al on nutrient uptake, msinly N (NH4+ and N03-), and they were not directly correlated with the scoring of Al-tolerance. Plants grown in N03--N accumulated more Al in the roots and it might be related to solution pH-changes. Tolerant varieties accumulated less Al. It was concluded the differential Al-tolerance among those varieties could not be explained solely by the ability of plants to maintain a high solution pH in mixed N solutions. The root apex (root cap, meristem, and root elongation ...
650 $aaluminum
650 $amalates
650 $aplant physiology
650 $arhizosphere
650 $aroots
650 $atoxicity
650 $avarieties
650 $awheat
650 $aÁcido Orgânico
650 $aAlumínio
650 $aFisiologia Vegetal
650 $aRaiz
650 $aRelação Solo-Planta
650 $aRizosfera
650 $aToxidez
650 $aTrigo
650 $aTriticum Aestivum
650 $aVariedade
653 $aAluminium
653 $aDiferenca varietal
653 $aDifference
653 $aMalato
653 $aMecanismo
653 $aMechanism
653 $aOrganic acids
653 $aPlant soil relations
653 $aSoil deficiencies
653 $aSoil toxity
653 $aTolerance
653 $aTolerancia
653 $aToxicidade
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Registro original: |
Embrapa Cerrados (CPAC) |
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Biblioteca |
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Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
07/02/2002 |
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Data da última atualização: |
10/09/2004 |
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Autoria: |
FERRAZ, J. B. S.; DUARTE, F. A. de M. |
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Título: |
Índices de Seleção Aplicados à Produtividade de Porcas Large White. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, V.26, n.10, p.1777-1786, out. 1991 |
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Idioma: |
Português |
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Conteúdo: |
Dados referentes a 801 partos de 255 porcas Large Wbite, criadas em região subtropical, foram analisados pelo método dos quadrados mínimos para estudar componentes de variância e covariância genética e fenotípica no que se refere a atributos ligados à produtividade de porcas, quais sejam. número de natimortos (NM); tamanho (TL) e peso de leitegada (PL) ao nascimento (0); aos 21 dias de idade (21) e à desmama (d). A combinação desses atri~ butos, da maneira mais aplicável possível, resultou seis diferentes índices de seleção para aumento da produtividade das matrizes. Tais índices apresentaram correlações com o genótipo agregado [r(I,H)1 variando de 0,46 a 1,04. No entanto, as expectativas de ganho genético, aplicando-se intensidade de seleção de um desvio-padrão do índice, apresentaram valores muito superiores à média obtida em experimentos de seleção, não se recomendando sua utilização. Sugere-se a ampliação do estudo, com dados mais abrangentes, para se poder indicar a aplicação destes índices. |
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Palavras-Chave: |
ganho genético; nascimento; natimortos; suínos. |
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Thesagro: |
Genótipo; Leitegada. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/21288/1/pab26_out_91.pdf
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Marc: |
LEADER 01625naa a2200205 a 4500
001 1106180
005 2004-09-10
008 1991 bl uuuu u00u1 u #d
100 1 $aFERRAZ, J. B. S.
245 $aÍndices de Seleção Aplicados à Produtividade de Porcas Large White.
260 $c1991
520 $aDados referentes a 801 partos de 255 porcas Large Wbite, criadas em região subtropical, foram analisados pelo método dos quadrados mínimos para estudar componentes de variância e covariância genética e fenotípica no que se refere a atributos ligados à produtividade de porcas, quais sejam. número de natimortos (NM); tamanho (TL) e peso de leitegada (PL) ao nascimento (0); aos 21 dias de idade (21) e à desmama (d). A combinação desses atri~ butos, da maneira mais aplicável possível, resultou seis diferentes índices de seleção para aumento da produtividade das matrizes. Tais índices apresentaram correlações com o genótipo agregado [r(I,H)1 variando de 0,46 a 1,04. No entanto, as expectativas de ganho genético, aplicando-se intensidade de seleção de um desvio-padrão do índice, apresentaram valores muito superiores à média obtida em experimentos de seleção, não se recomendando sua utilização. Sugere-se a ampliação do estudo, com dados mais abrangentes, para se poder indicar a aplicação destes índices.
650 $aGenótipo
650 $aLeitegada
653 $aganho genético
653 $anascimento
653 $anatimortos
653 $asuínos
700 1 $aDUARTE, F. A. de M.
773 $tPesquisa Agropecuária Brasileira, Brasília, V.26$gn.10, p.1777-1786, out. 1991
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Embrapa Unidades Centrais (AI-SEDE) |
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