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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
13/10/2008 |
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Data da última atualização: |
19/02/2009 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
ALVES, A.; FREGENE, M.; SETTER, T.; DUQUE, L.; FERGUSON, M.; MKAMILO, G. |
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Afiliação: |
Alfredo Augusto Cunha Alves, CNPMF; Martin Fregene, CIAT; Tim Setter, Cornell University; Luis Duque, Cornel University; Morag Ferguson, IITA; Geoffrey Mkamilo, Agricultural Research Institute. |
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Título: |
Identifying the physiological and genetic traits related to drought tolerance mechanisms in cassava. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
In: SCIENTIFIC MEETING OF THE GLOBAL CASSAVA PARTNERSHIP, 1., 2008, Ghent. Cassava: meeting the challenges of the new millennium. Ghent:: IPBO, 2008. p. 142. |
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Idioma: |
Inglês |
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Notas: |
S10-6. |
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Conteúdo: |
To elucidate the mechanisms underlying drought tolerance in cassava and to determine the best physiological and genetic traits to be selected for in breeding programs, a collaborative work among Embrapa, CIAT, IITA, Cornell University, and African NARIs (National Agricultural Research Institures) has been going on since 2005, funded by the Generation Chalenge Program (GCP). Selected contrasting varieties have been screened and evaluated in four representative semi-arid environments in Brazil, Colombia, Tanzania and Ghana. Several trials have tested some hypotheses to characterize genotypes for drought tolerance traits, including: 1) genotypes that accumulate substantial stem starch reserves may be more able to sustain meristems and other respiring organs during a prolonged stress; 2) genotypes that maintain deep fibrous root growth would perform better in drought; 3) genotypes that maintain partitioning to storage roots and have high harvest index yield better in drought; and 4) genotypes that are more effective in closing stomata might be more able to maintain status and retain leaves. Contrasting cassava varieties were crossed at CIAT and segregation populations of F1 seeds obtained. The embryos of each seed were rescued and micropropagated in vitro. A total of 370 individuals from three populations were cloned and around five in vitro copies of each genotype were shipped to the target sites for multiplication and phenotypic evaluation. A genotypic parental screen has revealed 168 polymorphic SSRs in COL1734 x VEN77 and 147 in COL 1468 x BRA 255, from 307 SSRs screened. Genotyping of the mapping populations is underway. MenosTo elucidate the mechanisms underlying drought tolerance in cassava and to determine the best physiological and genetic traits to be selected for in breeding programs, a collaborative work among Embrapa, CIAT, IITA, Cornell University, and African NARIs (National Agricultural Research Institures) has been going on since 2005, funded by the Generation Chalenge Program (GCP). Selected contrasting varieties have been screened and evaluated in four representative semi-arid environments in Brazil, Colombia, Tanzania and Ghana. Several trials have tested some hypotheses to characterize genotypes for drought tolerance traits, including: 1) genotypes that accumulate substantial stem starch reserves may be more able to sustain meristems and other respiring organs during a prolonged stress; 2) genotypes that maintain deep fibrous root growth would perform better in drought; 3) genotypes that maintain partitioning to storage roots and have high harvest index yield better in drought; and 4) genotypes that are more effective in closing stomata might be more able to maintain status and retain leaves. Contrasting cassava varieties were crossed at CIAT and segregation populations of F1 seeds obtained. The embryos of each seed were rescued and micropropagated in vitro. A total of 370 individuals from three populations were cloned and around five in vitro copies of each genotype were shipped to the target sites for multiplication and phenotypic evaluation. A genotypic parental screen has rev... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02288naa a2200193 a 4500
001 1637949
005 2009-02-19
008 2008 bl uuuu u00u1 u #d
100 1 $aALVES, A.
245 $aIdentifying the physiological and genetic traits related to drought tolerance mechanisms in cassava.
260 $c2008
500 $aS10-6.
520 $aTo elucidate the mechanisms underlying drought tolerance in cassava and to determine the best physiological and genetic traits to be selected for in breeding programs, a collaborative work among Embrapa, CIAT, IITA, Cornell University, and African NARIs (National Agricultural Research Institures) has been going on since 2005, funded by the Generation Chalenge Program (GCP). Selected contrasting varieties have been screened and evaluated in four representative semi-arid environments in Brazil, Colombia, Tanzania and Ghana. Several trials have tested some hypotheses to characterize genotypes for drought tolerance traits, including: 1) genotypes that accumulate substantial stem starch reserves may be more able to sustain meristems and other respiring organs during a prolonged stress; 2) genotypes that maintain deep fibrous root growth would perform better in drought; 3) genotypes that maintain partitioning to storage roots and have high harvest index yield better in drought; and 4) genotypes that are more effective in closing stomata might be more able to maintain status and retain leaves. Contrasting cassava varieties were crossed at CIAT and segregation populations of F1 seeds obtained. The embryos of each seed were rescued and micropropagated in vitro. A total of 370 individuals from three populations were cloned and around five in vitro copies of each genotype were shipped to the target sites for multiplication and phenotypic evaluation. A genotypic parental screen has revealed 168 polymorphic SSRs in COL1734 x VEN77 and 147 in COL 1468 x BRA 255, from 307 SSRs screened. Genotyping of the mapping populations is underway.
700 1 $aFREGENE, M.
700 1 $aSETTER, T.
700 1 $aDUQUE, L.
700 1 $aFERGUSON, M.
700 1 $aMKAMILO, G.
773 $tIn: SCIENTIFIC MEETING OF THE GLOBAL CASSAVA PARTNERSHIP, 1., 2008, Ghent. Cassava: meeting the challenges of the new millennium. Ghent:: IPBO, 2008. p. 142.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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Nenhum exemplar cadastrado para este documento. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Hortaliças. Para informações adicionais entre em contato com cnph.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Hortaliças. |
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Data corrente: |
19/05/1999 |
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Data da última atualização: |
19/05/1999 |
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Autoria: |
VELHO, C. C.; MAGALHAES, J. R.; MATOS, J. K. A. |
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Afiliação: |
EMBRAPA-CNPH, Brasilia, DF. |
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Título: |
Descricao de sintomas de deficiencia mineral em quiabo. |
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Ano de publicação: |
1988 |
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Fonte/Imprenta: |
Horticultura Brasileira, Brasilia, v.6, n.1, p.34, maio 1988. |
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Idioma: |
Português |
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Palavras-Chave: |
Deficiencies; Descricao; Description; Symptoms. |
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Thesagro: |
Abelmoschus Esculentus; Deficiência; Mineral; Quiabo; Sintoma. |
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Thesaurus NAL: |
minerals; okra. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00680naa a2200265 a 4500
001 1764184
005 1999-05-19
008 1988 bl uuuu u00u1 u #d
100 1 $aVELHO, C. C.
245 $aDescricao de sintomas de deficiencia mineral em quiabo.
260 $c1988
650 $aminerals
650 $aokra
650 $aAbelmoschus Esculentus
650 $aDeficiência
650 $aMineral
650 $aQuiabo
650 $aSintoma
653 $aDeficiencies
653 $aDescricao
653 $aDescription
653 $aSymptoms
700 1 $aMAGALHAES, J. R.
700 1 $aMATOS, J. K. A.
773 $tHorticultura Brasileira, Brasilia$gv.6, n.1, p.34, maio 1988.
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Registro original: |
Embrapa Hortaliças (CNPH) |
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