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).

Detalhes bibliográficos
Autor(a) principal: ARAGÃO, D. V.
Data de Publicação: 2005
Outros Autores: FORTINI, L. B., MULKEY, S. S., ZARIN, D. J., ARAUJO, M. M., CARVALHO, C. J. R. de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/578363
Resumo: 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.
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spelling 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).AmazonCompensatory photosynthesisDrought seasonalityReprodutive phenologySecondary forestnitrogen contentAlternative 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.DEBORA VEIGA ARAGÃO, UFRA; CLAUDIO JOSE REIS DE CARVALHO, CPATU.ARAGÃO, D. V.FORTINI, L. B.MULKEY, S. S.ZARIN, D. J.ARAUJO, M. M.CARVALHO, C. J. R. de2011-04-10T11:11:11Z2011-04-10T11:11:11Z2009-12-1820052016-11-28T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleAmerican Journal of Botany, v. 92, n. 3, p. 456-461, Mar. 2005.http://www.alice.cnptia.embrapa.br/alice/handle/doc/57836310.3732/ajb.92.3.456enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2017-08-16T03:50:28Zoai:www.alice.cnptia.embrapa.br:doc/578363Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542017-08-16T03:50:28falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-16T03:50:28Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv 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).
title 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).
spellingShingle 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).
ARAGÃO, D. V.
Amazon
Compensatory photosynthesis
Drought seasonality
Reprodutive phenology
Secondary forest
nitrogen content
title_short 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).
title_full 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).
title_fullStr 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).
title_full_unstemmed 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).
title_sort 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).
author ARAGÃO, D. V.
author_facet ARAGÃO, D. V.
FORTINI, L. B.
MULKEY, S. S.
ZARIN, D. J.
ARAUJO, M. M.
CARVALHO, C. J. R. de
author_role author
author2 FORTINI, L. B.
MULKEY, S. S.
ZARIN, D. J.
ARAUJO, M. M.
CARVALHO, C. J. R. de
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv DEBORA VEIGA ARAGÃO, UFRA; CLAUDIO JOSE REIS DE CARVALHO, CPATU.
dc.contributor.author.fl_str_mv ARAGÃO, D. V.
FORTINI, L. B.
MULKEY, S. S.
ZARIN, D. J.
ARAUJO, M. M.
CARVALHO, C. J. R. de
dc.subject.por.fl_str_mv Amazon
Compensatory photosynthesis
Drought seasonality
Reprodutive phenology
Secondary forest
nitrogen content
topic Amazon
Compensatory photosynthesis
Drought seasonality
Reprodutive phenology
Secondary forest
nitrogen content
description 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.
publishDate 2005
dc.date.none.fl_str_mv 2005
2009-12-18
2011-04-10T11:11:11Z
2011-04-10T11:11:11Z
2016-11-28T11:11:11Z
dc.type.driver.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv American Journal of Botany, v. 92, n. 3, p. 456-461, Mar. 2005.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/578363
10.3732/ajb.92.3.456
identifier_str_mv American Journal of Botany, v. 92, n. 3, p. 456-461, Mar. 2005.
10.3732/ajb.92.3.456
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/578363
dc.language.iso.fl_str_mv eng
language eng
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dc.source.none.fl_str_mv reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
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instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
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reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
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