| |
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Milho e Sorgo. |
|
Data corrente: |
14/12/2005 |
|
Data da última atualização: |
30/05/2018 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
PINEROS, M. A.; SHAFF, J. E.; MANSLANK, H. S.; ALVES, V. M. C.; KOCHIAN, L. V. |
|
Afiliação: |
VERA MARIA CARVALHO ALVES, CNPMS. |
|
Título: |
Aluminum resistance in maize cannot be solely explained by root organic acid exudation. A comparative physiological study |
|
Ano de publicação: |
2005 |
|
Fonte/Imprenta: |
Plant Physiology, Bethesda, v. 137, n. 1, p. 231-241, 2005. |
|
Idioma: |
Inglês |
|
Conteúdo: |
Root apical aluminum (Al) exclusion via Al-activated root citrate exudation is widely accepted as the main Al-resistance mechanism operating in maize (Zea mays) roots. Nonetheless, the correlation between Al resistance and this Al-exclusion mechanism has not been tested beyond a very small number of Al-resistant and Al-sensitive maize lines. In this study, we conducted a comparative study of the physiology of Al resistance using six different maize genotypes that capture the range of maize Al resistance and differ significantly in their genetic background (three Brazilian and three North American genotypes). In these maize lines, we were able to establish a clear correlation between root tip Al exclusion (based on root Al content) and Al resistance. Both Al-resistant genotypes and three of the four Al-sensitive lines exhibited a significant Al-activated citrate exudation, with no evidence for Al activation of root malate or phosphate release. There was a lack of correlation between differential Al resistance and root citrate exudation for the six maize genotypes; in fact, one of the Al-sensitive lines, Mo17, had the largest Al-activated citrate exudation of all of the maize lines. Our results indicate that although root organic acid release may play a role in maize Al resistance, it is clearly not the only or the main resistance mechanism operating in these maize roots. A number of other potential Al-resistance mechanisms were investigated, including release of other Al-chelating ligands, Al-induced alkalinization of rhizosphere pH, changes in internal levels of Al-chelating compounds in the root, and Al translocation to the shoot. However, we were unsuccessful in identifying additional Al-resistance mechanisms in maize. It is likely that a purely physiological approach may not be sufficient to identify these novel Al-resistance mechanisms in maize and this will require an interdisciplinary approach integrating genetic, molecular, and physiological investigations. MenosRoot apical aluminum (Al) exclusion via Al-activated root citrate exudation is widely accepted as the main Al-resistance mechanism operating in maize (Zea mays) roots. Nonetheless, the correlation between Al resistance and this Al-exclusion mechanism has not been tested beyond a very small number of Al-resistant and Al-sensitive maize lines. In this study, we conducted a comparative study of the physiology of Al resistance using six different maize genotypes that capture the range of maize Al resistance and differ significantly in their genetic background (three Brazilian and three North American genotypes). In these maize lines, we were able to establish a clear correlation between root tip Al exclusion (based on root Al content) and Al resistance. Both Al-resistant genotypes and three of the four Al-sensitive lines exhibited a significant Al-activated citrate exudation, with no evidence for Al activation of root malate or phosphate release. There was a lack of correlation between differential Al resistance and root citrate exudation for the six maize genotypes; in fact, one of the Al-sensitive lines, Mo17, had the largest Al-activated citrate exudation of all of the maize lines. Our results indicate that although root organic acid release may play a role in maize Al resistance, it is clearly not the only or the main resistance mechanism operating in these maize roots. A number of other potential Al-resistance mechanisms were investigated, including release of other Al-chel... Mostrar Tudo |
|
Thesagro: |
Milho. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02572naa a2200181 a 4500
001 1489062
005 2018-05-30
008 2005 bl uuuu u00u1 u #d
100 1 $aPINEROS, M. A.
245 $aAluminum resistance in maize cannot be solely explained by root organic acid exudation. A comparative physiological study$h[electronic resource]
260 $c2005
520 $aRoot apical aluminum (Al) exclusion via Al-activated root citrate exudation is widely accepted as the main Al-resistance mechanism operating in maize (Zea mays) roots. Nonetheless, the correlation between Al resistance and this Al-exclusion mechanism has not been tested beyond a very small number of Al-resistant and Al-sensitive maize lines. In this study, we conducted a comparative study of the physiology of Al resistance using six different maize genotypes that capture the range of maize Al resistance and differ significantly in their genetic background (three Brazilian and three North American genotypes). In these maize lines, we were able to establish a clear correlation between root tip Al exclusion (based on root Al content) and Al resistance. Both Al-resistant genotypes and three of the four Al-sensitive lines exhibited a significant Al-activated citrate exudation, with no evidence for Al activation of root malate or phosphate release. There was a lack of correlation between differential Al resistance and root citrate exudation for the six maize genotypes; in fact, one of the Al-sensitive lines, Mo17, had the largest Al-activated citrate exudation of all of the maize lines. Our results indicate that although root organic acid release may play a role in maize Al resistance, it is clearly not the only or the main resistance mechanism operating in these maize roots. A number of other potential Al-resistance mechanisms were investigated, including release of other Al-chelating ligands, Al-induced alkalinization of rhizosphere pH, changes in internal levels of Al-chelating compounds in the root, and Al translocation to the shoot. However, we were unsuccessful in identifying additional Al-resistance mechanisms in maize. It is likely that a purely physiological approach may not be sufficient to identify these novel Al-resistance mechanisms in maize and this will require an interdisciplinary approach integrating genetic, molecular, and physiological investigations.
650 $aMilho
700 1 $aSHAFF, J. E.
700 1 $aMANSLANK, H. S.
700 1 $aALVES, V. M. C.
700 1 $aKOCHIAN, L. V.
773 $tPlant Physiology, Bethesda$gv. 137, n. 1, p. 231-241, 2005.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Milho e Sorgo. |
|
Data corrente: |
04/11/1997 |
|
Data da última atualização: |
11/06/2018 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
BORRERO, J. C.; PANDEY, S.; CEBALLOS, H.; MAGNAVACA, R.; BAHIA FILHO, A. F. C. |
|
Afiliação: |
EMBRAPA/CNPMS. |
|
Título: |
Genetic variances for tolerance to soil acidity in a tropical maize population. |
|
Ano de publicação: |
1995 |
|
Fonte/Imprenta: |
Maydica, Bergamo, v. 40, n. 3, p. 283-288, 1995. |
|
Idioma: |
Inglês |
|
Conteúdo: |
Soil acidity reduces yield on approximately 10% of the maize (Zea mays L.) area in developing countries. Information on the inheritance of acid-soil tolerance would help scientists chose more appropriate methods for efficient breeding of tolerant cultivars. We used a North Carolina Design II mating system to study the relative importance of additive (VA) and dominante (VD) variances and their interactions with environments in the 'SA-4' tropical maize population. One-hundred-sixty S1 lines were randomly assigned to 20 sets of eight lines. Within each set, four lines were arbitrarly designated as males and four as females. Each male was crossed with each female in the et, providing 16 full-sib familes. The 20 sets, with 16 full-sib families each, were field-planted in two replications in one non-acid- and four acid-soil environments during 1992 in Colombia and Brazil. Across acid soils, VD was significantly greater than VA for yield (0.22 vs. 0.09) and days to silk (2.33 vs. 1.35) and lower for ear height (23.93 vs. 37.48), ears/plant (0.0013 vs. 0.0018), and ear rot (4.86 vs. 13.68). Heritabilities, based on half-sib family means, averaged 0.39+/-0.14 for yield, 0,43+/-0.14 for days to silk, 0.66+/-0.13 for ear height, 0,47+/-0.14 for ears plant-1, and 0,48+/-0.14 for ear rot across the acid-soil environments. Magnitudes of VA and VD and their interactions with environments indicated that reciprocal recurrent selection, using multilocation testing would be effective for developing improved maize cultivars (...) MenosSoil acidity reduces yield on approximately 10% of the maize (Zea mays L.) area in developing countries. Information on the inheritance of acid-soil tolerance would help scientists chose more appropriate methods for efficient breeding of tolerant cultivars. We used a North Carolina Design II mating system to study the relative importance of additive (VA) and dominante (VD) variances and their interactions with environments in the 'SA-4' tropical maize population. One-hundred-sixty S1 lines were randomly assigned to 20 sets of eight lines. Within each set, four lines were arbitrarly designated as males and four as females. Each male was crossed with each female in the et, providing 16 full-sib familes. The 20 sets, with 16 full-sib families each, were field-planted in two replications in one non-acid- and four acid-soil environments during 1992 in Colombia and Brazil. Across acid soils, VD was significantly greater than VA for yield (0.22 vs. 0.09) and days to silk (2.33 vs. 1.35) and lower for ear height (23.93 vs. 37.48), ears/plant (0.0013 vs. 0.0018), and ear rot (4.86 vs. 13.68). Heritabilities, based on half-sib family means, averaged 0.39+/-0.14 for yield, 0,43+/-0.14 for days to silk, 0.66+/-0.13 for ear height, 0,47+/-0.14 for ears plant-1, and 0,48+/-0.14 for ear rot across the acid-soil environments. Magnitudes of VA and VD and their interactions with environments indicated that reciprocal recurrent selection, using multilocation testing would be effective for deve... Mostrar Tudo |
|
Thesagro: |
Milho. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02057naa a2200181 a 4500
001 1477166
005 2018-06-11
008 1995 bl uuuu u00u1 u #d
100 1 $aBORRERO, J. C.
245 $aGenetic variances for tolerance to soil acidity in a tropical maize population.$h[electronic resource]
260 $c1995
520 $aSoil acidity reduces yield on approximately 10% of the maize (Zea mays L.) area in developing countries. Information on the inheritance of acid-soil tolerance would help scientists chose more appropriate methods for efficient breeding of tolerant cultivars. We used a North Carolina Design II mating system to study the relative importance of additive (VA) and dominante (VD) variances and their interactions with environments in the 'SA-4' tropical maize population. One-hundred-sixty S1 lines were randomly assigned to 20 sets of eight lines. Within each set, four lines were arbitrarly designated as males and four as females. Each male was crossed with each female in the et, providing 16 full-sib familes. The 20 sets, with 16 full-sib families each, were field-planted in two replications in one non-acid- and four acid-soil environments during 1992 in Colombia and Brazil. Across acid soils, VD was significantly greater than VA for yield (0.22 vs. 0.09) and days to silk (2.33 vs. 1.35) and lower for ear height (23.93 vs. 37.48), ears/plant (0.0013 vs. 0.0018), and ear rot (4.86 vs. 13.68). Heritabilities, based on half-sib family means, averaged 0.39+/-0.14 for yield, 0,43+/-0.14 for days to silk, 0.66+/-0.13 for ear height, 0,47+/-0.14 for ears plant-1, and 0,48+/-0.14 for ear rot across the acid-soil environments. Magnitudes of VA and VD and their interactions with environments indicated that reciprocal recurrent selection, using multilocation testing would be effective for developing improved maize cultivars (...)
650 $aMilho
700 1 $aPANDEY, S.
700 1 $aCEBALLOS, H.
700 1 $aMAGNAVACA, R.
700 1 $aBAHIA FILHO, A. F. C.
773 $tMaydica, Bergamo$gv. 40, n. 3, p. 283-288, 1995.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
