Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations
Autor(a) principal: | |
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Data de Publicação: | 2001 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.1/1021 |
Resumo: | The responses of leaf growth and leaf water relations to seasonal drought were monitored, during two successive years, in three cultivars of Ceratonia siliqua L. growing in the field, in the South of Portugal. In leaves from the current year growth bulk leaf water relations parameters were characterised using pressure-volume analysis, and morphometric measurements of xylem in petioles were undertaken. The three cultivars under study (Galhosa, Espargal and Mulata) differed as to the seasonal pattern of leaf initiation: in Galhosa a sharp peak of leaf initiation occurred in June, soon before the period in which the highest leaf expansion rates were determined; on the other two cultivars (Espargal and Mulata), not only the onset of leaf growth occurred earlier, but they continued producing new leaves throughout the summer period. The diurnal pattern of water relations determined in recently-expanded leaves indicated that Galhosa was the only cultivar in which, during midsummer, leaf water potential was not decreased below the turgor loss point and leaf relative water content remained above 90%. Although no conclusive evidence was found for the occurrence of osmotic adjustment in recently-expanded leaves, during the dry season following leaf formation a seasonal decrease in osmotic potential sufficient to maintain turgor was detected in the leaves of Galhosa but not for the other cultivars. As to the anatomy of the xylem at the petioles, the widest xylem conduits were recorded in Galhosa. This might contribute to explain why in this cultivar midday leaf water potential never decreased below –2.0 MPa even at the end of summer drought season. |
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Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relationsCarob treeXylem anatomyWater stressOsmotic adjustmentThe responses of leaf growth and leaf water relations to seasonal drought were monitored, during two successive years, in three cultivars of Ceratonia siliqua L. growing in the field, in the South of Portugal. In leaves from the current year growth bulk leaf water relations parameters were characterised using pressure-volume analysis, and morphometric measurements of xylem in petioles were undertaken. The three cultivars under study (Galhosa, Espargal and Mulata) differed as to the seasonal pattern of leaf initiation: in Galhosa a sharp peak of leaf initiation occurred in June, soon before the period in which the highest leaf expansion rates were determined; on the other two cultivars (Espargal and Mulata), not only the onset of leaf growth occurred earlier, but they continued producing new leaves throughout the summer period. The diurnal pattern of water relations determined in recently-expanded leaves indicated that Galhosa was the only cultivar in which, during midsummer, leaf water potential was not decreased below the turgor loss point and leaf relative water content remained above 90%. Although no conclusive evidence was found for the occurrence of osmotic adjustment in recently-expanded leaves, during the dry season following leaf formation a seasonal decrease in osmotic potential sufficient to maintain turgor was detected in the leaves of Galhosa but not for the other cultivars. As to the anatomy of the xylem at the petioles, the widest xylem conduits were recorded in Galhosa. This might contribute to explain why in this cultivar midday leaf water potential never decreased below –2.0 MPa even at the end of summer drought season.SapientiaCorreia, Maria JoãoCoelho, DulceDavid, Maria Manuela2012-04-13T09:27:23Z20012012-04-12T15:14:32Z2001-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/1021engCorreia, Maria João; Coelho, D.; David, Maria Manuela. Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations. Tree Physiology, 21, 10, 645-653, 2001.0829-318XAUT: JCO00381; MDA00369;info: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:RCAAP2023-07-24T10:11:55Zoai:sapientia.ualg.pt:10400.1/1021Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:55:15.915164Repositório 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 |
Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations |
title |
Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations |
spellingShingle |
Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations Correia, Maria João Carob tree Xylem anatomy Water stress Osmotic adjustment |
title_short |
Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations |
title_full |
Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations |
title_fullStr |
Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations |
title_full_unstemmed |
Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations |
title_sort |
Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations |
author |
Correia, Maria João |
author_facet |
Correia, Maria João Coelho, Dulce David, Maria Manuela |
author_role |
author |
author2 |
Coelho, Dulce David, Maria Manuela |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Sapientia |
dc.contributor.author.fl_str_mv |
Correia, Maria João Coelho, Dulce David, Maria Manuela |
dc.subject.por.fl_str_mv |
Carob tree Xylem anatomy Water stress Osmotic adjustment |
topic |
Carob tree Xylem anatomy Water stress Osmotic adjustment |
description |
The responses of leaf growth and leaf water relations to seasonal drought were monitored, during two successive years, in three cultivars of Ceratonia siliqua L. growing in the field, in the South of Portugal. In leaves from the current year growth bulk leaf water relations parameters were characterised using pressure-volume analysis, and morphometric measurements of xylem in petioles were undertaken. The three cultivars under study (Galhosa, Espargal and Mulata) differed as to the seasonal pattern of leaf initiation: in Galhosa a sharp peak of leaf initiation occurred in June, soon before the period in which the highest leaf expansion rates were determined; on the other two cultivars (Espargal and Mulata), not only the onset of leaf growth occurred earlier, but they continued producing new leaves throughout the summer period. The diurnal pattern of water relations determined in recently-expanded leaves indicated that Galhosa was the only cultivar in which, during midsummer, leaf water potential was not decreased below the turgor loss point and leaf relative water content remained above 90%. Although no conclusive evidence was found for the occurrence of osmotic adjustment in recently-expanded leaves, during the dry season following leaf formation a seasonal decrease in osmotic potential sufficient to maintain turgor was detected in the leaves of Galhosa but not for the other cultivars. As to the anatomy of the xylem at the petioles, the widest xylem conduits were recorded in Galhosa. This might contribute to explain why in this cultivar midday leaf water potential never decreased below –2.0 MPa even at the end of summer drought season. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001 2001-01-01T00:00:00Z 2012-04-13T09:27:23Z 2012-04-12T15:14:32Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.1/1021 |
url |
http://hdl.handle.net/10400.1/1021 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Correia, Maria João; Coelho, D.; David, Maria Manuela. Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations. Tree Physiology, 21, 10, 645-653, 2001. 0829-318X AUT: JCO00381; MDA00369; |
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 |
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1799133153938374656 |