|
|
Registro Completo |
Biblioteca(s): |
Embrapa Hortaliças. |
Data corrente: |
29/04/1997 |
Data da última atualização: |
29/04/1997 |
Autoria: |
RESENDE, L. V. |
Título: |
Mecanismos de resistencia a tospovirus e capacidade de combinacao de linhagens de tomate (Lycopersicon esculentum Mill.) do Grupo Santa Cruz. |
Ano de publicação: |
1996 |
Fonte/Imprenta: |
Lavras: UFLA, 1996. |
Páginas: |
134p. |
Idioma: |
Português |
Notas: |
Tese Doutorado. |
Conteúdo: |
Este ttrabalho teve como objetivo caracterizar linhagens de tomateiro oriundas do cruzamente [(Stevens x Santa Clara) x Santa Clara], quanto a resistencia a tospovirus, comparar mecanismos de resistencia destas linhagens com outras do mesmo background, porem com resistencia de Rey de Los Tempranos e identificar combinacoes entre essas linhagens e destas com cultivares comerciais atraves de analise dialelica, que se revelem superiores quanto a resistencia a tospovirus e caracteres agronomicos. |
Palavras-Chave: |
Combining ability; Heterose; Resistance; Vira-cabeca; Virus diseases. |
Thesagro: |
Doença; Hibrido; Lycopersicon Esculentum; Resistência; Tomate; Vírus. |
Thesaurus Nal: |
heterosis; hybrids; tomatoes; Tospovirus. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01324nam a2200313 a 4500 001 1757287 005 1997-04-29 008 1996 bl uuuu m 00u1 u #d 100 1 $aRESENDE, L. V. 245 $aMecanismos de resistencia a tospovirus e capacidade de combinacao de linhagens de tomate (Lycopersicon esculentum Mill.) do Grupo Santa Cruz. 260 $aLavras: UFLA$c1996 300 $a134p. 500 $aTese Doutorado. 520 $aEste ttrabalho teve como objetivo caracterizar linhagens de tomateiro oriundas do cruzamente [(Stevens x Santa Clara) x Santa Clara], quanto a resistencia a tospovirus, comparar mecanismos de resistencia destas linhagens com outras do mesmo background, porem com resistencia de Rey de Los Tempranos e identificar combinacoes entre essas linhagens e destas com cultivares comerciais atraves de analise dialelica, que se revelem superiores quanto a resistencia a tospovirus e caracteres agronomicos. 650 $aheterosis 650 $ahybrids 650 $atomatoes 650 $aTospovirus 650 $aDoença 650 $aHibrido 650 $aLycopersicon Esculentum 650 $aResistência 650 $aTomate 650 $aVírus 653 $aCombining ability 653 $aHeterose 653 $aResistance 653 $aVira-cabeca 653 $aVirus diseases
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Hortaliças (CNPH) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
| Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
22/11/2002 |
Data da última atualização: |
29/09/2004 |
Autoria: |
MACEDO, J. |
Título: |
Preferential reduction of hematite over goethite in some oxisols in Brazil. |
Ano de publicação: |
1988 |
Fonte/Imprenta: |
1988. |
Páginas: |
43 f. |
Idioma: |
Inglês |
Notas: |
Thesis (Doctor of Philosophy) - Cornell University, [S. l.]. |
Conteúdo: |
Research was conducted to evaluate iron transformations in a hydrosequence of oxisols from the Central Plateau of Brazil. The best-drained member of the hydrosequence of soils selected for the study classifies as a Typic Acrustox (Dark-Red Latosol) and has codominant hematite and goethite iron oxide mineralogy and reddish hues (2.5 YR). X-ray diffraction and chemical extraction techniques were used to make detailed analyses of the iron oxides. Peak positions for hematite are coincident with those reported for normal hematite. Peak positions for goethite are shifted toward a lower dspacing, which corresponds to 38 mole % of Al00H substituting for Fe00H. Soil samples from the Bo horizon were subjected to reducing conditions in the laboratory over a range of timeperiods, using sucrose as a source of energy to speed yp the activity of the soil microorganisms. Reducing conditions in other samples were induced by citrate-bicarbonate-dithionite treatment at room temperature, using increasing additions of dithionite to achieve a range in reduction of these soils. In both experiments, the observed changes in soil minerologies confirm the preferential reduction and removal of hematite over goethite. The dithionite reduction of aluminum-substituted goethite is temperature dependent. The electrode potential of hematite and aluminum-substituted goethite are 98 and -2 mV respectively. Mineralogies and soil colors after reduction treatments are comparable to that of the Typic Acrustox (Red-Yellow Latosol) found in the wetter section of the hydrosequence. The results of this study support the hypothesis that differences in colors and iron mineralogies of soils in this hydrosequence are the result of the preferential reduction of hematite over goethite in the presence of a seasonally high water table. MenosResearch was conducted to evaluate iron transformations in a hydrosequence of oxisols from the Central Plateau of Brazil. The best-drained member of the hydrosequence of soils selected for the study classifies as a Typic Acrustox (Dark-Red Latosol) and has codominant hematite and goethite iron oxide mineralogy and reddish hues (2.5 YR). X-ray diffraction and chemical extraction techniques were used to make detailed analyses of the iron oxides. Peak positions for hematite are coincident with those reported for normal hematite. Peak positions for goethite are shifted toward a lower dspacing, which corresponds to 38 mole % of Al00H substituting for Fe00H. Soil samples from the Bo horizon were subjected to reducing conditions in the laboratory over a range of timeperiods, using sucrose as a source of energy to speed yp the activity of the soil microorganisms. Reducing conditions in other samples were induced by citrate-bicarbonate-dithionite treatment at room temperature, using increasing additions of dithionite to achieve a range in reduction of these soils. In both experiments, the observed changes in soil minerologies confirm the preferential reduction and removal of hematite over goethite. The dithionite reduction of aluminum-substituted goethite is temperature dependent. The electrode potential of hematite and aluminum-substituted goethite are 98 and -2 mV respectively. Mineralogies and soil colors after reduction treatments are comparable to that of the Typic Acrustox (Red... Mostrar Tudo |
Palavras-Chave: |
Brasil; Goethita; Hematita. |
Thesagro: |
Cerrado; Mineralogia; Oxisol; Solo. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02370nam a2200217 a 4500 001 1567792 005 2004-09-29 008 1988 bl uuuu m 00u1 u #d 100 1 $aMACEDO, J. 245 $aPreferential reduction of hematite over goethite in some oxisols in Brazil. 260 $a1988.$c1988 300 $a43 f. 500 $aThesis (Doctor of Philosophy) - Cornell University, [S. l.]. 520 $aResearch was conducted to evaluate iron transformations in a hydrosequence of oxisols from the Central Plateau of Brazil. The best-drained member of the hydrosequence of soils selected for the study classifies as a Typic Acrustox (Dark-Red Latosol) and has codominant hematite and goethite iron oxide mineralogy and reddish hues (2.5 YR). X-ray diffraction and chemical extraction techniques were used to make detailed analyses of the iron oxides. Peak positions for hematite are coincident with those reported for normal hematite. Peak positions for goethite are shifted toward a lower dspacing, which corresponds to 38 mole % of Al00H substituting for Fe00H. Soil samples from the Bo horizon were subjected to reducing conditions in the laboratory over a range of timeperiods, using sucrose as a source of energy to speed yp the activity of the soil microorganisms. Reducing conditions in other samples were induced by citrate-bicarbonate-dithionite treatment at room temperature, using increasing additions of dithionite to achieve a range in reduction of these soils. In both experiments, the observed changes in soil minerologies confirm the preferential reduction and removal of hematite over goethite. The dithionite reduction of aluminum-substituted goethite is temperature dependent. The electrode potential of hematite and aluminum-substituted goethite are 98 and -2 mV respectively. Mineralogies and soil colors after reduction treatments are comparable to that of the Typic Acrustox (Red-Yellow Latosol) found in the wetter section of the hydrosequence. The results of this study support the hypothesis that differences in colors and iron mineralogies of soils in this hydrosequence are the result of the preferential reduction of hematite over goethite in the presence of a seasonally high water table. 650 $aCerrado 650 $aMineralogia 650 $aOxisol 650 $aSolo 653 $aBrasil 653 $aGoethita 653 $aHematita
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Cerrados (CPAC) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
Nenhum registro encontrado para a expressão de busca informada. |
|
|