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 | Acesso ao texto completo restrito à biblioteca da Embrapa Arroz e Feijão. Para informações adicionais entre em contato com cnpaf.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
05/12/2018 |
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Data da última atualização: |
12/02/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
HEINEMANN, A. B.; RAMIREZ-VILLEGAS, J.; REBOLLEDO, M. C.; COSTA NETO, G. M. F.; CASTRO, A. P. de. |
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Afiliação: |
ALEXANDRE BRYAN HEINEMANN, CNPAF; JULIAN RAMIREZ-VILLEGAS, CIAT; MARIA CAMILA REBOLLEDO, CIAT; GERMANO MARTINS F. COSTA NETO, UFG; ADRIANO PEREIRA DE CASTRO, CNPAF. |
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Título: |
Upland rice breeding led to increased drought sensitivity in Brazil. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Field Crops Research, v. 231, p. 57-67, 2019. |
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ISSN: |
0378-4290 |
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DOI: |
10.1016/j.fcr.2018.11.009 |
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Idioma: |
Inglês |
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Conteúdo: |
The upland rice (UR) crop system located in the Brazilian savannas (states of Mato Grosso, Rondônia, Tocantins and Goiás) is the main upland rice growing area of Brazil and the largest rainfed rice growing area in Latin America. It plays an important social and economic role in central Brazil. UR cropped area, however, has decreased by 70% in the last two decades, partly due to high drought risk. Here, we hypothesize that the UR breeding program?s focus on direct grain selection for wide adaptation has led to an increase in yield potential but a reduction in the capacity of modern cultivars to maintain yield under drought stress. Using the ORYZAv3 rice crop model, we analyzed changes in relative and absolute drought impact for cultivars representative of three decades of breeding: 1980s (1986?1992), 1990s (1993?2002), and 2000s (2003?2013). We found a mean increase in relative drought impact of 12% (0.35% per year) between 1980s and 2000s. Most of the increase occurred during 1980s and 1990s (7%), where a major shift from landraces (i.e. Douradão) to modern cultivars (i.e. cv. BRS Primavera) occurred in the breeding program. Drought adaptation traits such as greater root length density, shorter cycle, and lower stomatal sensitivity to drought have been systematically bred out of the UR material in the period 1980?2013. We recommend the UR breeding program to be adjusted by better targeting to specific drought environments, and by taking into account drought stress profiles and environmental co-variables in statistical analyses for genotype selection. Moreover, physiological studies on tradeoffs between yield potential and drought tolerance should be performed for each target environment to dissect plant traits that confer both high yield potential and low drought sensitivity. These strategies will ultimately ensure that newly released cultivars are adapted to the environmental conditions of the study region, therefore reducing agroclimatic risk for UR farmers. MenosThe upland rice (UR) crop system located in the Brazilian savannas (states of Mato Grosso, Rondônia, Tocantins and Goiás) is the main upland rice growing area of Brazil and the largest rainfed rice growing area in Latin America. It plays an important social and economic role in central Brazil. UR cropped area, however, has decreased by 70% in the last two decades, partly due to high drought risk. Here, we hypothesize that the UR breeding program?s focus on direct grain selection for wide adaptation has led to an increase in yield potential but a reduction in the capacity of modern cultivars to maintain yield under drought stress. Using the ORYZAv3 rice crop model, we analyzed changes in relative and absolute drought impact for cultivars representative of three decades of breeding: 1980s (1986?1992), 1990s (1993?2002), and 2000s (2003?2013). We found a mean increase in relative drought impact of 12% (0.35% per year) between 1980s and 2000s. Most of the increase occurred during 1980s and 1990s (7%), where a major shift from landraces (i.e. Douradão) to modern cultivars (i.e. cv. BRS Primavera) occurred in the breeding program. Drought adaptation traits such as greater root length density, shorter cycle, and lower stomatal sensitivity to drought have been systematically bred out of the UR material in the period 1980?2013. We recommend the UR breeding program to be adjusted by better targeting to specific drought environments, and by taking into account drought stress profiles a... Mostrar Tudo |
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Palavras-Chave: |
Traditional and modern genotypes. |
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Thesagro: |
Arroz; Genótipo; Melhoramento Genético Vegetal; Oryza Sativa; Resistência a Seca. |
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Thesaurus Nal: |
Breeding methods; Crop models; Rice. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 02864naa a2200301 a 4500
001 2100803
005 2020-02-12
008 2019 bl uuuu u00u1 u #d
022 $a0378-4290
024 7 $a10.1016/j.fcr.2018.11.009$2DOI
100 1 $aHEINEMANN, A. B.
245 $aUpland rice breeding led to increased drought sensitivity in Brazil.$h[electronic resource]
260 $c2019
520 $aThe upland rice (UR) crop system located in the Brazilian savannas (states of Mato Grosso, Rondônia, Tocantins and Goiás) is the main upland rice growing area of Brazil and the largest rainfed rice growing area in Latin America. It plays an important social and economic role in central Brazil. UR cropped area, however, has decreased by 70% in the last two decades, partly due to high drought risk. Here, we hypothesize that the UR breeding program?s focus on direct grain selection for wide adaptation has led to an increase in yield potential but a reduction in the capacity of modern cultivars to maintain yield under drought stress. Using the ORYZAv3 rice crop model, we analyzed changes in relative and absolute drought impact for cultivars representative of three decades of breeding: 1980s (1986?1992), 1990s (1993?2002), and 2000s (2003?2013). We found a mean increase in relative drought impact of 12% (0.35% per year) between 1980s and 2000s. Most of the increase occurred during 1980s and 1990s (7%), where a major shift from landraces (i.e. Douradão) to modern cultivars (i.e. cv. BRS Primavera) occurred in the breeding program. Drought adaptation traits such as greater root length density, shorter cycle, and lower stomatal sensitivity to drought have been systematically bred out of the UR material in the period 1980?2013. We recommend the UR breeding program to be adjusted by better targeting to specific drought environments, and by taking into account drought stress profiles and environmental co-variables in statistical analyses for genotype selection. Moreover, physiological studies on tradeoffs between yield potential and drought tolerance should be performed for each target environment to dissect plant traits that confer both high yield potential and low drought sensitivity. These strategies will ultimately ensure that newly released cultivars are adapted to the environmental conditions of the study region, therefore reducing agroclimatic risk for UR farmers.
650 $aBreeding methods
650 $aCrop models
650 $aRice
650 $aArroz
650 $aGenótipo
650 $aMelhoramento Genético Vegetal
650 $aOryza Sativa
650 $aResistência a Seca
653 $aTraditional and modern genotypes
700 1 $aRAMIREZ-VILLEGAS, J.
700 1 $aREBOLLEDO, M. C.
700 1 $aCOSTA NETO, G. M. F.
700 1 $aCASTRO, A. P. de
773 $tField Crops Research$gv. 231, p. 57-67, 2019.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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| Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com cnpgc.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
19/07/1999 |
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Data da última atualização: |
19/07/1999 |
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Autoria: |
FEIJÓ, G. L. D. |
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Afiliação: |
EMBRAPA. Centro Nacional de Pesquisa de Gado de Corte (Campo Grande,MS). |
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Título: |
Qualidade da carne bovina. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
In: CURSO CONHECENDO A CARNE QUE VOCÊ CONSOME, 1., 1999, Campo Grande. Qualidade da carne bovina. Campo Grande: Embrapa gado de Corte, 1999. |
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Páginas: |
p.6-25. |
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Série: |
(Embrapa Gado de Corte. Documentos, 77). |
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ISBN: |
85-297-053-8 |
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Idioma: |
Português |
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Notas: |
CNPGC. |
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Conteúdo: |
A carne como alimento; Definição de carne. Noções de ciência da carne. Estrutura da carne. Tecido muscular. Tecido conjuntivo. Tecido adiposo. Composição química da carne bovina (valor nutricional). Proteínas. Lipídios. Vitaminas. Minerais. Água. Conversão do músculo em carne. Contração muscular. Rigor mortis. Características organolépticas da carne. Cor. Odor e sabor. Suculência. Maciez. Alterações na carne processada. Efeito do frio. Efeito da salga. Efeito da cocção. |
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Palavras-Chave: |
Bovino de corte; Cattle meat; Processing; Quality. |
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Thesagro: |
Carne; Processamento; Qualidade; Valor Nutritivo. |
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Thesaurus NAL: |
nutritive value. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01247naa a2200265 a 4500
001 1318319
005 1999-07-19
008 1999 bl uuuu u00u1 u #d
100 1 $aFEIJÓ, G. L. D.
245 $aQualidade da carne bovina.
260 $c1999
300 $ap.6-25.
490 $a(Embrapa Gado de Corte. Documentos, 77).
500 $aCNPGC.
520 $aA carne como alimento; Definição de carne. Noções de ciência da carne. Estrutura da carne. Tecido muscular. Tecido conjuntivo. Tecido adiposo. Composição química da carne bovina (valor nutricional). Proteínas. Lipídios. Vitaminas. Minerais. Água. Conversão do músculo em carne. Contração muscular. Rigor mortis. Características organolépticas da carne. Cor. Odor e sabor. Suculência. Maciez. Alterações na carne processada. Efeito do frio. Efeito da salga. Efeito da cocção.
650 $anutritive value
650 $aCarne
650 $aProcessamento
650 $aQualidade
650 $aValor Nutritivo
653 $aBovino de corte
653 $aCattle meat
653 $aProcessing
653 $aQuality
773 $tIn: CURSO CONHECENDO A CARNE QUE VOCÊ CONSOME, 1., 1999, Campo Grande. Qualidade da carne bovina. Campo Grande: Embrapa gado de Corte, 1999.
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Embrapa Gado de Corte (CNPGC) |
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