Comparing water relations and stomatal regulation of Touriga Nacional and Syrah under mild water stress

Detalhes bibliográficos
Autor(a) principal: Lopes, C.M.
Data de Publicação: 2012
Outros Autores: Monteiro, Ana, Chaves, M.M.
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/5510
Resumo: Proceedings - IX International Terroir Congress, 2012
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spelling Comparing water relations and stomatal regulation of Touriga Nacional and Syrah under mild water stressgrapevineleaf water potentialphotosynthetic ratestomatal conductanceProceedings - IX International Terroir Congress, 2012Aiming to compare the physiological responses of the Portuguese red variety Touriga Nacional (TN) with Syrah (SY), we studied during the 2007 growing season five-year-old grapevines growing in a commercial non-irrigated vineyard located at the Lisbon winegrowing region. Predawn (Ypd) and midday (YM) leaf water potential, leaf stomatal conductance (gs) and photosynthetic rate (A) were periodically measured between fruit set and harvest. Ypd displayed a decreasing pattern throughout the growing cycle from -0.10 MPa at flowering to -0.44 MPa at harvest. Both varieties showed similar values except during the two measurements made in August when TN presented significantly higher values than SY. Ymid also showed a decreasing pattern from the end of June towards harvest date, with significant differences between varieties being observed during the ripening period, with SY showing lower values than TN. A measured either at mid-morning and midday presented, for most part of the cases, lower values in SY than in TN, although the differences were only significant during the ripening period. gs pattern was parallel to A and, in general, the relative differences between varieties mirrored those reported for A. No significant effect of the variety was detected on the relationships between A or gs measured at mid-morning and Ypd. However, when analyzing the set of data collected at midday it was observed that the regression lines of the relationships between A or gs (dependent variables) and Ypd (independent variable) presented a significantly higher slope in SY as compared to those showed by TN. These results show that the rate of decrease of A and gs with the decrease of Ypd was lower in TN than in SY suggesting that the two varieties have different stomatal regulation, with a more “optimistic” behavior in TN.Repositório da Universidade de LisboaLopes, C.M.Monteiro, AnaChaves, M.M.2013-05-22T15:37:09Z20122012-01-01T00:00:00Zconference objectinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10400.5/5510enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-11-20T19:05:51Zoai:repositorio.ul.pt:10400.5/5510Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-11-20T19:05:51Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Comparing water relations and stomatal regulation of Touriga Nacional and Syrah under mild water stress
title Comparing water relations and stomatal regulation of Touriga Nacional and Syrah under mild water stress
spellingShingle Comparing water relations and stomatal regulation of Touriga Nacional and Syrah under mild water stress
Lopes, C.M.
grapevine
leaf water potential
photosynthetic rate
stomatal conductance
title_short Comparing water relations and stomatal regulation of Touriga Nacional and Syrah under mild water stress
title_full Comparing water relations and stomatal regulation of Touriga Nacional and Syrah under mild water stress
title_fullStr Comparing water relations and stomatal regulation of Touriga Nacional and Syrah under mild water stress
title_full_unstemmed Comparing water relations and stomatal regulation of Touriga Nacional and Syrah under mild water stress
title_sort Comparing water relations and stomatal regulation of Touriga Nacional and Syrah under mild water stress
author Lopes, C.M.
author_facet Lopes, C.M.
Monteiro, Ana
Chaves, M.M.
author_role author
author2 Monteiro, Ana
Chaves, M.M.
author2_role author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Lopes, C.M.
Monteiro, Ana
Chaves, M.M.
dc.subject.por.fl_str_mv grapevine
leaf water potential
photosynthetic rate
stomatal conductance
topic grapevine
leaf water potential
photosynthetic rate
stomatal conductance
description Proceedings - IX International Terroir Congress, 2012
publishDate 2012
dc.date.none.fl_str_mv 2012
2012-01-01T00:00:00Z
2013-05-22T15:37:09Z
dc.type.driver.fl_str_mv conference object
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.5/5510
url http://hdl.handle.net/10400.5/5510
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv mluisa.alvim@gmail.com
_version_ 1817549449622192128

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