Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)

Detalhes bibliográficos
Autor(a) principal: Haddad,Claudia Regina Baptista
Data de Publicação: 2004
Outros Autores: Lemos,Damiani Pereira, Mazzafera,Paulo
Tipo de documento: Relatório
Idioma: eng
Título da fonte: Scientia Agrícola (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400018
Resumo: In comparison to deciduous species, evergreen plants have lower leaf nutrient contents and higher leaf life span, important mechanisms for nutrient economy, allowing the colonization of low fertility soils. Strategies to conserve nitrogen in two semideciduous tropical forest tree species, with different leaf life spans were analyzed. The hypothesis was the fact that the two species would present different nitrogen conservation mechanisms in relation to chemical (total nitrogen, protein, chlorophyll, and proteolytic activity), functional (leaf life span, N-use efficiency, and N-resorption efficiency), morphological (specific leaf mass) leaf characteristics, and total nitrogen in the soil. Hymenaea courbaril L. presented lower nitrogen compounds in leaves, longer leaf life span, higher N-use efficiency, and higher specific leaf mass, while absorbing proportionally less nitrogen from the soil than Croton priscus Croizat. These characteristics can contribute for a better nitrogen economy strategy of H. courbaril. No relationship was found between leaf life span and N resorption efficiency, nor between leaf life span, protease activity and nitrogen mobilization. The electrophoretic profiles of proteolytic enzymes in young leaves of the two species presented more bands with enzymatic activity than other kinds of leaves.
id USP-18_3d653c6cf43c9d1b945aa7193916f5f1
oai_identifier_str oai:scielo:S0103-90162004000400018
network_acronym_str USP-18
network_name_str Scientia Agrícola (Online)
repository_id_str
spelling Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)leaf life spanspecific leaf massN-resorption efficiencyN-use efficiencyAtlantic forestIn comparison to deciduous species, evergreen plants have lower leaf nutrient contents and higher leaf life span, important mechanisms for nutrient economy, allowing the colonization of low fertility soils. Strategies to conserve nitrogen in two semideciduous tropical forest tree species, with different leaf life spans were analyzed. The hypothesis was the fact that the two species would present different nitrogen conservation mechanisms in relation to chemical (total nitrogen, protein, chlorophyll, and proteolytic activity), functional (leaf life span, N-use efficiency, and N-resorption efficiency), morphological (specific leaf mass) leaf characteristics, and total nitrogen in the soil. Hymenaea courbaril L. presented lower nitrogen compounds in leaves, longer leaf life span, higher N-use efficiency, and higher specific leaf mass, while absorbing proportionally less nitrogen from the soil than Croton priscus Croizat. These characteristics can contribute for a better nitrogen economy strategy of H. courbaril. No relationship was found between leaf life span and N resorption efficiency, nor between leaf life span, protease activity and nitrogen mobilization. The electrophoretic profiles of proteolytic enzymes in young leaves of the two species presented more bands with enzymatic activity than other kinds of leaves.Escola Superior de Agricultura "Luiz de Queiroz"2004-01-01info:eu-repo/semantics/reportinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400018Scientia Agricola v.61 n.4 2004reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/S0103-90162004000400018info:eu-repo/semantics/openAccessHaddad,Claudia Regina BaptistaLemos,Damiani PereiraMazzafera,Pauloeng2004-11-09T00:00:00Zoai:scielo:S0103-90162004000400018Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2004-11-09T00:00Scientia Agrícola (Online) - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)
title Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)
spellingShingle Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)
Haddad,Claudia Regina Baptista
leaf life span
specific leaf mass
N-resorption efficiency
N-use efficiency
Atlantic forest
title_short Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)
title_full Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)
title_fullStr Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)
title_full_unstemmed Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)
title_sort Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)
author Haddad,Claudia Regina Baptista
author_facet Haddad,Claudia Regina Baptista
Lemos,Damiani Pereira
Mazzafera,Paulo
author_role author
author2 Lemos,Damiani Pereira
Mazzafera,Paulo
author2_role author
author
dc.contributor.author.fl_str_mv Haddad,Claudia Regina Baptista
Lemos,Damiani Pereira
Mazzafera,Paulo
dc.subject.por.fl_str_mv leaf life span
specific leaf mass
N-resorption efficiency
N-use efficiency
Atlantic forest
topic leaf life span
specific leaf mass
N-resorption efficiency
N-use efficiency
Atlantic forest
description In comparison to deciduous species, evergreen plants have lower leaf nutrient contents and higher leaf life span, important mechanisms for nutrient economy, allowing the colonization of low fertility soils. Strategies to conserve nitrogen in two semideciduous tropical forest tree species, with different leaf life spans were analyzed. The hypothesis was the fact that the two species would present different nitrogen conservation mechanisms in relation to chemical (total nitrogen, protein, chlorophyll, and proteolytic activity), functional (leaf life span, N-use efficiency, and N-resorption efficiency), morphological (specific leaf mass) leaf characteristics, and total nitrogen in the soil. Hymenaea courbaril L. presented lower nitrogen compounds in leaves, longer leaf life span, higher N-use efficiency, and higher specific leaf mass, while absorbing proportionally less nitrogen from the soil than Croton priscus Croizat. These characteristics can contribute for a better nitrogen economy strategy of H. courbaril. No relationship was found between leaf life span and N resorption efficiency, nor between leaf life span, protease activity and nitrogen mobilization. The electrophoretic profiles of proteolytic enzymes in young leaves of the two species presented more bands with enzymatic activity than other kinds of leaves.
publishDate 2004
dc.date.none.fl_str_mv 2004-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/report
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format report
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400018
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400018
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-90162004000400018
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Escola Superior de Agricultura "Luiz de Queiroz"
publisher.none.fl_str_mv Escola Superior de Agricultura "Luiz de Queiroz"
dc.source.none.fl_str_mv Scientia Agricola v.61 n.4 2004
reponame:Scientia Agrícola (Online)
instname:Universidade de São Paulo (USP)
instacron:USP
instname_str Universidade de São Paulo (USP)
instacron_str USP
institution USP
reponame_str Scientia Agrícola (Online)
collection Scientia Agrícola (Online)
repository.name.fl_str_mv Scientia Agrícola (Online) - Universidade de São Paulo (USP)
repository.mail.fl_str_mv scientia@usp.br||alleoni@usp.br
_version_ 1748936459600003072