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Registro Completo |
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
18/12/2009 |
Data da última atualização: |
17/11/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
ARAGÃO, D. V.; FORTINI, L. B.; MULKEY, S. S.; ZARIN, D. J.; ARAUJO, M. M.; CARVALHO, C. J. R. de. |
Afiliação: |
DEBORA VEIGA ARAGÃO, UFRA; CLAUDIO JOSE REIS DE CARVALHO, CPATU. |
Título: |
Correlation but no causation between leaf nitrogen and maximum assimilation: the role of drought and reproduction in gas exchange in an understory tropical plant Miconia ciliata (Melastomataceae). |
Ano de publicação: |
2005 |
Fonte/Imprenta: |
American Journal of Botany, v. 92, n. 3, p. 456-461, Mar. 2005. |
DOI: |
10.3732/ajb.92.3.456 |
Idioma: |
Inglês |
Conteúdo: |
Alternative hypotheses were tested to explain a previously reported anomaly in the response of leaf photosynthetic capacity at light saturation (A..) in Miconia ciliata to dry-season irrigation. The anomaly is characterized by an abrupt increase in leaf A._ for nonirrigated plants at the onset of the rainy season to values that significantly exceeded corresponding measurements for plants that were irrigated during the previous dry season. Hypothesis I posits that a pulse in leaf nitrogen increases CO2 assimilation in nonirrigated plants at the onset of the wet season and is dampened for irrigated plants; this hypothesis was rejected because, although a wet-season nitrogen pulse did occur, it was identical for both irrigated and nonirrigated plants and was preceded by the increase in assimilation by nonirrigated plants. Hypothesis 2 posits that a reproduction-related, compensatory photosynthetic response occurs in nonirrigated plants following the onset of the wet season and is dampened in irrigated plants; consistent with hypothesis 2, high maximum assimilation rates for control plants in the wet season were significantly correlated with fruiting and flowering, whereas irrigation caused flowering and fruiting in the dry season, spreading M. ciliata reproductive activity in irrigated plants across the entire year. |
Palavras-Chave: |
Amazon; Compensatory photosynthesis; Drought seasonality; Reprodutive phenology; Secondary forest. |
Thesaurus Nal: |
nitrogen content. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/96241/1/456.full.pdf
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Marc: |
LEADER 02248naa a2200265 a 4500 001 1578363 005 2022-11-17 008 2005 bl uuuu u00u1 u #d 024 7 $a10.3732/ajb.92.3.456$2DOI 100 1 $aARAGÃO, D. V. 245 $aCorrelation but no causation between leaf nitrogen and maximum assimilation$bthe role of drought and reproduction in gas exchange in an understory tropical plant Miconia ciliata (Melastomataceae).$h[electronic resource] 260 $c2005 520 $aAlternative hypotheses were tested to explain a previously reported anomaly in the response of leaf photosynthetic capacity at light saturation (A..) in Miconia ciliata to dry-season irrigation. The anomaly is characterized by an abrupt increase in leaf A._ for nonirrigated plants at the onset of the rainy season to values that significantly exceeded corresponding measurements for plants that were irrigated during the previous dry season. Hypothesis I posits that a pulse in leaf nitrogen increases CO2 assimilation in nonirrigated plants at the onset of the wet season and is dampened for irrigated plants; this hypothesis was rejected because, although a wet-season nitrogen pulse did occur, it was identical for both irrigated and nonirrigated plants and was preceded by the increase in assimilation by nonirrigated plants. Hypothesis 2 posits that a reproduction-related, compensatory photosynthetic response occurs in nonirrigated plants following the onset of the wet season and is dampened in irrigated plants; consistent with hypothesis 2, high maximum assimilation rates for control plants in the wet season were significantly correlated with fruiting and flowering, whereas irrigation caused flowering and fruiting in the dry season, spreading M. ciliata reproductive activity in irrigated plants across the entire year. 650 $anitrogen content 653 $aAmazon 653 $aCompensatory photosynthesis 653 $aDrought seasonality 653 $aReprodutive phenology 653 $aSecondary forest 700 1 $aFORTINI, L. B. 700 1 $aMULKEY, S. S. 700 1 $aZARIN, D. J. 700 1 $aARAUJO, M. M. 700 1 $aCARVALHO, C. J. R. de 773 $tAmerican Journal of Botany$gv. 92, n. 3, p. 456-461, Mar. 2005.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Registros recuperados : 3 | |
1. | | ARAGÃO, D. V.; FORTINI, L. B.; MULKEY, S. S.; ZARIN, D. J.; ARAUJO, M. M.; CARVALHO, C. J. R. de. Correlation but no causation between leaf nitrogen and maximum assimilation: the role of drought and reproduction in gas exchange in an understory tropical plant Miconia ciliata (Melastomataceae). American Journal of Botany, v. 92, n. 3, p. 456-461, Mar. 2005.Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
Biblioteca(s): Embrapa Amazônia Oriental. |
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3. | | ZARIN, D. J.; MULKEY, S. S.; VASCONCELOS, S. S.; FORTINI, L. B.; CARVALHO, C. J. R.; OLIVEIRA, F. A. Moisture stress constrains carbon flux rates in an Eastern Amazonian regrowth forest. In: CONFERÊNCIA CIENTÍFICA INTERNACIONAL DO LBA, 2., 2002, Manaus. Resumos. Manaus: LBA, 2002. Não paginado.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Amazônia Oriental. |
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Registros recuperados : 3 | |
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Nenhum registro encontrado para a expressão de busca informada. |
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