Gas exchange of the umbu tree under semi-arid conditions

Detalhes bibliográficos
Autor(a) principal: Lima Filho,José Moacir Pinheiro
Data de Publicação: 2004
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Revista brasileira de fruticultura (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452004000200006
Resumo: A study was carried out at Embrapa Semi-Árido, Petrolina-PE, Brazil, aiming to understand the gas exchange process of the umbu tree (Spondias tuberosa Arr. Cam.) in the dry and rainy seasons. Stomatal conductance, transpiration, photosynthesis and internal CO2 concentration were obtained with a portable infrared gas analyzer (IRGA). During the dry season the umbu tree showed a much lower stomatal conductance early in the morning, as soon as the vapor pressure deficit increased, apparently affecting CO2 assimilation more than transpiration. The highest values were detected around 6:00 am but decreased to the lowest points between 10:00 am and 2:00 pm. During the rainy season, however, stomatal conductance, transpiration and photosynthesis were significantly higher, reaching the highest values between 8:00 and 10:00 am and the lowest around 2:00 pm. It was also observed at 4:00 pm, mainly during the rainy season, an increase on these variables indicating that the umbu tree exhibits a two-picked daily course of gas exchange.
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spelling Gas exchange of the umbu tree under semi-arid conditionsSpondias tuberosastomatal conductancetranspirationphotosynthesisCO2 internal concentrationA study was carried out at Embrapa Semi-Árido, Petrolina-PE, Brazil, aiming to understand the gas exchange process of the umbu tree (Spondias tuberosa Arr. Cam.) in the dry and rainy seasons. Stomatal conductance, transpiration, photosynthesis and internal CO2 concentration were obtained with a portable infrared gas analyzer (IRGA). During the dry season the umbu tree showed a much lower stomatal conductance early in the morning, as soon as the vapor pressure deficit increased, apparently affecting CO2 assimilation more than transpiration. The highest values were detected around 6:00 am but decreased to the lowest points between 10:00 am and 2:00 pm. During the rainy season, however, stomatal conductance, transpiration and photosynthesis were significantly higher, reaching the highest values between 8:00 and 10:00 am and the lowest around 2:00 pm. It was also observed at 4:00 pm, mainly during the rainy season, an increase on these variables indicating that the umbu tree exhibits a two-picked daily course of gas exchange.Sociedade Brasileira de Fruticultura2004-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452004000200006Revista Brasileira de Fruticultura v.26 n.2 2004reponame:Revista brasileira de fruticultura (Online)instname:Sociedade Brasileira de Fruticultura (SBF)instacron:SBFRU10.1590/S0100-29452004000200006info:eu-repo/semantics/openAccessLima Filho,José Moacir Pinheiroeng2004-10-27T00:00:00Zoai:scielo:S0100-29452004000200006Revistahttp://www.scielo.br/rbfhttps://old.scielo.br/oai/scielo-oai.phprbf@fcav.unesp.br||http://rbf.org.br/1806-99670100-2945opendoar:2004-10-27T00:00Revista brasileira de fruticultura (Online) - Sociedade Brasileira de Fruticultura (SBF)false
dc.title.none.fl_str_mv Gas exchange of the umbu tree under semi-arid conditions
title Gas exchange of the umbu tree under semi-arid conditions
spellingShingle Gas exchange of the umbu tree under semi-arid conditions
Lima Filho,José Moacir Pinheiro
Spondias tuberosa
stomatal conductance
transpiration
photosynthesis
CO2 internal concentration
title_short Gas exchange of the umbu tree under semi-arid conditions
title_full Gas exchange of the umbu tree under semi-arid conditions
title_fullStr Gas exchange of the umbu tree under semi-arid conditions
title_full_unstemmed Gas exchange of the umbu tree under semi-arid conditions
title_sort Gas exchange of the umbu tree under semi-arid conditions
author Lima Filho,José Moacir Pinheiro
author_facet Lima Filho,José Moacir Pinheiro
author_role author
dc.contributor.author.fl_str_mv Lima Filho,José Moacir Pinheiro
dc.subject.por.fl_str_mv Spondias tuberosa
stomatal conductance
transpiration
photosynthesis
CO2 internal concentration
topic Spondias tuberosa
stomatal conductance
transpiration
photosynthesis
CO2 internal concentration
description A study was carried out at Embrapa Semi-Árido, Petrolina-PE, Brazil, aiming to understand the gas exchange process of the umbu tree (Spondias tuberosa Arr. Cam.) in the dry and rainy seasons. Stomatal conductance, transpiration, photosynthesis and internal CO2 concentration were obtained with a portable infrared gas analyzer (IRGA). During the dry season the umbu tree showed a much lower stomatal conductance early in the morning, as soon as the vapor pressure deficit increased, apparently affecting CO2 assimilation more than transpiration. The highest values were detected around 6:00 am but decreased to the lowest points between 10:00 am and 2:00 pm. During the rainy season, however, stomatal conductance, transpiration and photosynthesis were significantly higher, reaching the highest values between 8:00 and 10:00 am and the lowest around 2:00 pm. It was also observed at 4:00 pm, mainly during the rainy season, an increase on these variables indicating that the umbu tree exhibits a two-picked daily course of gas exchange.
publishDate 2004
dc.date.none.fl_str_mv 2004-08-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452004000200006
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452004000200006
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0100-29452004000200006
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 Sociedade Brasileira de Fruticultura
publisher.none.fl_str_mv Sociedade Brasileira de Fruticultura
dc.source.none.fl_str_mv Revista Brasileira de Fruticultura v.26 n.2 2004
reponame:Revista brasileira de fruticultura (Online)
instname:Sociedade Brasileira de Fruticultura (SBF)
instacron:SBFRU
instname_str Sociedade Brasileira de Fruticultura (SBF)
instacron_str SBFRU
institution SBFRU
reponame_str Revista brasileira de fruticultura (Online)
collection Revista brasileira de fruticultura (Online)
repository.name.fl_str_mv Revista brasileira de fruticultura (Online) - Sociedade Brasileira de Fruticultura (SBF)
repository.mail.fl_str_mv rbf@fcav.unesp.br||http://rbf.org.br/
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