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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados; Embrapa Soja. |
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Data corrente: |
16/02/1993 |
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Data da última atualização: |
16/02/1993 |
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Autoria: |
SPEHAR, C. R. |
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Título: |
The genetics of aluminium tolerance in soya beans Glycine max (L.) Merrill. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
Cambridge: University of Cambridge, 1989. |
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Páginas: |
124p. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Thesis. |
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Conteúdo: |
Aluminium toxicity is a widespread problem in the soils of most tropical areas of the world and is a major constraint in the establishment of stable farming systems. Even when soil fertility is improved, the roots of cultivated plants tend to be confined to the ploughed layer making the crop more vulnerable to dry spells. Crops with relatively high tolerance to aluminium are therefore needed and one of these crops, for wich a ready market exists, is the soya bean. This project started with a series of field experiments to evaluate the variability in aluminium tolerance of soya bean varieties which originated from various breeding programmes to adapt the crop to tropical regions of Brazil. Based on varietal performance, as measured by grain yield and mineralcomposition in the presence of high and low levels of aluminium, nine contrasting varieties were chosen for crossing schemes. A diallel cross and some backcrosses were obtained for the genetic studies. The genetics of aluminium tolerance was studied in these crosses by diallel and generation mean analyses in field and hydroponics experiments. The field experiments were conducted in the Centro de Pesquisa Agropecuaria dos Cerrados - CPAC, Planaltina, DF, Brazil. The F2 hybrids were used to determine the segregation patterns for tolerance to aluminium indicated by grain yield and mineral composition. The same crosses were tested in high-and low-aluminium areas and their relative performance was analysed. Previous experiments indicated that soya bean varieties... MenosAluminium toxicity is a widespread problem in the soils of most tropical areas of the world and is a major constraint in the establishment of stable farming systems. Even when soil fertility is improved, the roots of cultivated plants tend to be confined to the ploughed layer making the crop more vulnerable to dry spells. Crops with relatively high tolerance to aluminium are therefore needed and one of these crops, for wich a ready market exists, is the soya bean. This project started with a series of field experiments to evaluate the variability in aluminium tolerance of soya bean varieties which originated from various breeding programmes to adapt the crop to tropical regions of Brazil. Based on varietal performance, as measured by grain yield and mineralcomposition in the presence of high and low levels of aluminium, nine contrasting varieties were chosen for crossing schemes. A diallel cross and some backcrosses were obtained for the genetic studies. The genetics of aluminium tolerance was studied in these crosses by diallel and generation mean analyses in field and hydroponics experiments. The field experiments were conducted in the Centro de Pesquisa Agropecuaria dos Cerrados - CPAC, Planaltina, DF, Brazil. The F2 hybrids were used to determine the segregation patterns for tolerance to aluminium indicated by grain yield and mineral composition. The same crosses were tested in high-and low-aluminium areas and their relative performance was analysed. Previous experiments... Mostrar Tudo |
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Palavras-Chave: |
Aluminium; Brasil; Cultivar; Distrito Federal; Planaltina; Soybean; Tolerance; Tolerancia; Variety. |
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Thesagro: |
Alumínio; Cerrado; Genética Vegetal; Glycine Max; Melhoramento; Soja; Toxidez. |
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Thesaurus Nal: |
Brazil; breeding; genetics; soybeans; toxicity. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02451nam a2200385 a 4500
001 1548067
005 1993-02-16
008 1989 bl uuuu m 00u1 u #d
100 1 $aSPEHAR, C. R.
245 $aThe genetics of aluminium tolerance in soya beans Glycine max (L.) Merrill.
260 $aCambridge: University of Cambridge$c1989
300 $a124p.
500 $aPh.D. Thesis.
520 $aAluminium toxicity is a widespread problem in the soils of most tropical areas of the world and is a major constraint in the establishment of stable farming systems. Even when soil fertility is improved, the roots of cultivated plants tend to be confined to the ploughed layer making the crop more vulnerable to dry spells. Crops with relatively high tolerance to aluminium are therefore needed and one of these crops, for wich a ready market exists, is the soya bean. This project started with a series of field experiments to evaluate the variability in aluminium tolerance of soya bean varieties which originated from various breeding programmes to adapt the crop to tropical regions of Brazil. Based on varietal performance, as measured by grain yield and mineralcomposition in the presence of high and low levels of aluminium, nine contrasting varieties were chosen for crossing schemes. A diallel cross and some backcrosses were obtained for the genetic studies. The genetics of aluminium tolerance was studied in these crosses by diallel and generation mean analyses in field and hydroponics experiments. The field experiments were conducted in the Centro de Pesquisa Agropecuaria dos Cerrados - CPAC, Planaltina, DF, Brazil. The F2 hybrids were used to determine the segregation patterns for tolerance to aluminium indicated by grain yield and mineral composition. The same crosses were tested in high-and low-aluminium areas and their relative performance was analysed. Previous experiments indicated that soya bean varieties...
650 $aBrazil
650 $abreeding
650 $agenetics
650 $asoybeans
650 $atoxicity
650 $aAlumínio
650 $aCerrado
650 $aGenética Vegetal
650 $aGlycine Max
650 $aMelhoramento
650 $aSoja
650 $aToxidez
653 $aAluminium
653 $aBrasil
653 $aCultivar
653 $aDistrito Federal
653 $aPlanaltina
653 $aSoybean
653 $aTolerance
653 $aTolerancia
653 $aVariety
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Embrapa Cerrados (CPAC) |
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