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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
16/04/2004 |
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Data da última atualização: |
16/04/2004 |
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Autoria: |
CALATAYUD, P. A.; DUCHON, S.; LAMAZE, T. |
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Título: |
Estimation of carbon and nitrogen modification during water deficiency in leaves of cassava (Manihot esculenta Crantz). |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Revista Brasileira de Mandioca, Cruz das Almas, v. 17, p. 39, nov., 1998. Suplemento. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Several pests (mealybugs, whiteflies and mites) affect cassava yield, causing severe crop damage. It is well known that the population dynamics of these pests depend on environmental factors, including drought. Long dry periods frequently induce a strong outbreak in the number of these pests on cassava. This phenomenon partly depends on the changes in the trophic quality of the plant. Our general purpose is to determine the effect of water stress on cassava pest behavior and population dynamics. At present, our research is focused on the chances that water limitation may trigger in the biochemistry of cassava leaves (carbon and nitrogen metabolism). After limited water supply for 45 days in a glasshouse, cassava leaves exhibited an increase in 5 l 3C and phosphoenolpyruvate carboxylase activity. This was associated with a very low leaf conductance (not shown). Enhanced phosphoglycolate phosphatase activity indicates that photorespiration may have increased. The free amino acid level was higher in stressed plants. The amino acid composition was also affected showing mainly a decrease in aspartic acid, glutamic acid and alanine proportion and an increase in asparagine and arginine. Glucose, fructose and sucrose showed variable modification of their accumulation levels but the total carbohydrate amount of all three increased following water limitation. This was associated with higer sucrose phosphate synthase activity. According to the increase in free amino acid (especially serine and glycine) and to the relative low shift in 513C values in the leaves of drought-adapted cassava plants, our working hypothesis is that the highphosphoenolpyruvate carboxylase activity is due to an increase in photorespiration leading to acceleration of respiratory ammonium assimilation requiring a high anapleuretic phosphoenolpyruvate carboxylase functionning. MenosAbstract: Several pests (mealybugs, whiteflies and mites) affect cassava yield, causing severe crop damage. It is well known that the population dynamics of these pests depend on environmental factors, including drought. Long dry periods frequently induce a strong outbreak in the number of these pests on cassava. This phenomenon partly depends on the changes in the trophic quality of the plant. Our general purpose is to determine the effect of water stress on cassava pest behavior and population dynamics. At present, our research is focused on the chances that water limitation may trigger in the biochemistry of cassava leaves (carbon and nitrogen metabolism). After limited water supply for 45 days in a glasshouse, cassava leaves exhibited an increase in 5 l 3C and phosphoenolpyruvate carboxylase activity. This was associated with a very low leaf conductance (not shown). Enhanced phosphoglycolate phosphatase activity indicates that photorespiration may have increased. The free amino acid level was higher in stressed plants. The amino acid composition was also affected showing mainly a decrease in aspartic acid, glutamic acid and alanine proportion and an increase in asparagine and arginine. Glucose, fructose and sucrose showed variable modification of their accumulation levels but the total carbohydrate amount of all three increased following water limitation. This was associated with higer sucrose phosphate synthase activity. According to the increase in free amino acid (esp... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02364naa a2200145 a 4500
001 1651469
005 2004-04-16
008 1998 bl uuuu u00u1 u #d
100 1 $aCALATAYUD, P. A.
245 $aEstimation of carbon and nitrogen modification during water deficiency in leaves of cassava (Manihot esculenta Crantz).
260 $c1998
520 $aAbstract: Several pests (mealybugs, whiteflies and mites) affect cassava yield, causing severe crop damage. It is well known that the population dynamics of these pests depend on environmental factors, including drought. Long dry periods frequently induce a strong outbreak in the number of these pests on cassava. This phenomenon partly depends on the changes in the trophic quality of the plant. Our general purpose is to determine the effect of water stress on cassava pest behavior and population dynamics. At present, our research is focused on the chances that water limitation may trigger in the biochemistry of cassava leaves (carbon and nitrogen metabolism). After limited water supply for 45 days in a glasshouse, cassava leaves exhibited an increase in 5 l 3C and phosphoenolpyruvate carboxylase activity. This was associated with a very low leaf conductance (not shown). Enhanced phosphoglycolate phosphatase activity indicates that photorespiration may have increased. The free amino acid level was higher in stressed plants. The amino acid composition was also affected showing mainly a decrease in aspartic acid, glutamic acid and alanine proportion and an increase in asparagine and arginine. Glucose, fructose and sucrose showed variable modification of their accumulation levels but the total carbohydrate amount of all three increased following water limitation. This was associated with higer sucrose phosphate synthase activity. According to the increase in free amino acid (especially serine and glycine) and to the relative low shift in 513C values in the leaves of drought-adapted cassava plants, our working hypothesis is that the highphosphoenolpyruvate carboxylase activity is due to an increase in photorespiration leading to acceleration of respiratory ammonium assimilation requiring a high anapleuretic phosphoenolpyruvate carboxylase functionning.
700 1 $aDUCHON, S.
700 1 $aLAMAZE, T.
773 $tRevista Brasileira de Mandioca, Cruz das Almas$gv. 17, p. 39, nov., 1998. Suplemento.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com cnpgl.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
29/03/2011 |
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Data da última atualização: |
19/04/2011 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Autoria: |
HOTT, M. C.; FONSECA, L. D'A. M.; SOUZA, R. C. S. N. P. |
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Afiliação: |
MARCOS CICARINI HOTT, CNPGL; LETÍCIA D'AGOSTO MIGUEL FONSECA, UFJF; ROBERTO CARLOS SOARES NALON PEREIRA SOUZA, UFJF. |
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Título: |
Cenário Ambiental para a produção de leite considerando APP na Zona da Mata e Campo das Vertentes. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
In: CASTRO, C. R. T. de; MACHADO, M. A.; GOMES, F. T. Programa Institucional de Iniciação Científica da Embrapa Gado de Leite: produção científica resultante da capacitação de acadêmicos pelo corpo técnico da Unidade no período de 07/2009 a 06/2010. Juiz de Fora: Embrapa Gado de Leite, 2010. |
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Páginas: |
p. 109-115. |
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Idioma: |
Português |
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Palavras-Chave: |
Área de Preservação Ambiental; Mapeamento. |
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Thesagro: |
Pastagem. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 00812naa a2200181 a 4500
001 1883693
005 2011-04-19
008 2010 bl uuuu u00u1 u #d
100 1 $aHOTT, M. C.
245 $aCenário Ambiental para a produção de leite considerando APP na Zona da Mata e Campo das Vertentes.
260 $c2010
300 $ap. 109-115.
650 $aPastagem
653 $aÁrea de Preservação Ambiental
653 $aMapeamento
700 1 $aFONSECA, L. D'A. M.
700 1 $aSOUZA, R. C. S. N. P.
773 $tIn: CASTRO, C. R. T. de; MACHADO, M. A.; GOMES, F. T. Programa Institucional de Iniciação Científica da Embrapa Gado de Leite: produção científica resultante da capacitação de acadêmicos pelo corpo técnico da Unidade no período de 07/2009 a 06/2010. Juiz de Fora: Embrapa Gado de Leite, 2010.
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