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Registro Completo |
Biblioteca(s): |
Embrapa Milho e Sorgo. |
Data corrente: |
18/10/2007 |
Data da última atualização: |
25/05/2018 |
Autoria: |
WELCKER, C.; THÉ, C.; ANDRÉAU, B.; LEON, C. de; PARENTONI, S. N.; BERNAL, J.; FÉLICITÉ, J.; ZONKENG, C.; SALAZAR, F.; NARRO, L.; CHARCOSSET, A.; HORST, W. J. |
Afiliação: |
SIDNEY NETTO PARENTONI, CNPMS. |
Título: |
Heterosis and combining ability for maize adaptation to tropical acid soils: implications for future breeding strategies. |
Ano de publicação: |
2005 |
Fonte/Imprenta: |
Crop Science, Madison, v. 42, n. 2, p. 2405-2413, 2005. |
Idioma: |
Inglês |
Conteúdo: |
Soil acidity reduces maize (Zea mays L.) yields by up to 70% on 8 million hectares in developing countries. Several breeding programs have produced populations better adapted to these conditions. The objectives of this study were to evaluate these populations for both per se cultivation and the development of new breeding germplasm. To do so, we generated a diallel cross design, which included six acid soil-tolerant and five susceptible populations with high yield potential or tolerance to other stresses. Populations and crosses were evaluated in five environments, on acidic Al-toxic soils and in comparable limed soils in Guadeloupe, Cameroon, and Colombia. Soil acidity decreased grain yield by 46 to 73%, depending on the location and year. Significant genotype x soil condition interactions were observed for grain yield. Mid-parent heterosis for yield was significantly higher in acid soils (32%) than in nonacid soils (20%). This suggests that the development of variety crosses between acid soil-tolerant populations could be used to increase maize yields in acid-soil cropping systems. The observed high general combining ability (GCA) for yield variation of the crosses in acid soil and its close relationship to per se performance suggest that parental populations of variety crosses could be efficiently screened on the basis of per se performance in acid soil. |
Thesagro: |
Acidez do solo; Milho. |
Categoria do assunto: |
S Ciências Biológicas |
Marc: |
LEADER 02168naa a2200277 a 4500 001 1490773 005 2018-05-25 008 2005 bl uuuu u00u1 u #d 100 1 $aWELCKER, C. 245 $aHeterosis and combining ability for maize adaptation to tropical acid soils$bimplications for future breeding strategies.$h[electronic resource] 260 $c2005 520 $aSoil acidity reduces maize (Zea mays L.) yields by up to 70% on 8 million hectares in developing countries. Several breeding programs have produced populations better adapted to these conditions. The objectives of this study were to evaluate these populations for both per se cultivation and the development of new breeding germplasm. To do so, we generated a diallel cross design, which included six acid soil-tolerant and five susceptible populations with high yield potential or tolerance to other stresses. Populations and crosses were evaluated in five environments, on acidic Al-toxic soils and in comparable limed soils in Guadeloupe, Cameroon, and Colombia. Soil acidity decreased grain yield by 46 to 73%, depending on the location and year. Significant genotype x soil condition interactions were observed for grain yield. Mid-parent heterosis for yield was significantly higher in acid soils (32%) than in nonacid soils (20%). This suggests that the development of variety crosses between acid soil-tolerant populations could be used to increase maize yields in acid-soil cropping systems. The observed high general combining ability (GCA) for yield variation of the crosses in acid soil and its close relationship to per se performance suggest that parental populations of variety crosses could be efficiently screened on the basis of per se performance in acid soil. 650 $aAcidez do solo 650 $aMilho 700 1 $aTHÉ, C. 700 1 $aANDRÉAU, B. 700 1 $aLEON, C. de 700 1 $aPARENTONI, S. N. 700 1 $aBERNAL, J. 700 1 $aFÉLICITÉ, J. 700 1 $aZONKENG, C. 700 1 $aSALAZAR, F. 700 1 $aNARRO, L. 700 1 $aCHARCOSSET, A. 700 1 $aHORST, W. J. 773 $tCrop Science, Madison$gv. 42, n. 2, p. 2405-2413, 2005.
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Embrapa Milho e Sorgo (CNPMS) |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
29/08/2006 |
Data da última atualização: |
28/11/2022 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
SANTANA, A. C. de; LOPES, M. L. B.; HOMMA, A. K. O.; NOGUEIRA, O. L. |
Afiliação: |
ANTONIO CORDEIRO DE SANTANA, FCAP; MARIA LUCIA BAHIA LOPES, BASA / UNAMA; ALFREDO KINGO OYAMA HOMMA, CPATU; OSMAR LAMEIRA NOGUEIRA, CPATU. |
Título: |
Benefícios sociais do açaí manejado no Estado do Pará. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE ECONOMIA E SOCIOLOGIA RURAL, 40., 2002, Passo Fundo. Eqüidade e eficiência na agricultura brasileira: anais. Passo Fundo: Universidade de Passo Fundo: SOBER, 2002. |
Páginas: |
p. 101. |
Idioma: |
Português |
Palavras-Chave: |
Aspecto econômico; Brasil; Pará. |
Thesagro: |
Açaí; Manejo; Recurso Natural. |
Thesaurus NAL: |
Amazonia. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/102354/1/5752.pdf
|
Marc: |
LEADER 00766nam a2200229 a 4500 001 1408504 005 2022-11-28 008 2002 bl uuuu u00u1 u #d 100 1 $aSANTANA, A. C. de 245 $aBenefícios sociais do açaí manejado no Estado do Pará.$h[electronic resource] 260 $aIn: CONGRESSO BRASILEIRO DE ECONOMIA E SOCIOLOGIA RURAL, 40., 2002, Passo Fundo. Eqüidade e eficiência na agricultura brasileira: anais. Passo Fundo: Universidade de Passo Fundo: SOBER$c2002 300 $ap. 101. 650 $aAmazonia 650 $aAçaí 650 $aManejo 650 $aRecurso Natural 653 $aAspecto econômico 653 $aBrasil 653 $aPará 700 1 $aLOPES, M. L. B. 700 1 $aHOMMA, A. K. O. 700 1 $aNOGUEIRA, O. L.
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