Biblioteca Digital de VanguardiaThe phenomenon of cavitation in grapevine… : unravelling implicated mechanisms
Cavitation is a physiological dysfunction that takes place in the xylem of water stressed plants. It leads to a loss of hydraulic conductance (kL) as the vessels are filled with air. This impacts water supply, water potential (ΨL) and canopy hydration. Stomatal clossure is an effective response upon...
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias
2018
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| Acceso en línea: | http://bdigital.uncu.edu.ar/11589 |
| _version_ | 1782342537102491648 |
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| author | Hugalde, Inés Bonada, Marcos Vila, Hernán |
| author_facet | Hugalde, Inés Bonada, Marcos Vila, Hernán |
| author_sort | Hugalde, Inés |
| collection | Repositorio |
| description | Cavitation is a physiological dysfunction that takes place in the xylem of water stressed
plants. It leads to a loss of hydraulic conductance (kL) as the vessels are filled with air. This
impacts water supply, water potential (ΨL) and canopy hydration. Stomatal clossure is an
effective response upon diminishing momentary or seasonal foliar hydraulic contents.
Depending on each type of plant, stomata may close preventing catastrophic cavitations.
This research intended to understand how stomatal control acts upon cavitation
events in two contrasting grapevine varieties, Syrah and Grenache. A mechanistic was
developed model based on the water and vapour fluxes, kL, stomata conductance (gs),
and the vulnerability to cavitation of the xylematic tissue. The theoretical model explains
how plants respond to drought and avoid catastrophic cavitation. Water stressed grapevines
couple their gs with their kL in order to avoid embolism. It is not stomatal closure,
by istself, the controlling mechanism. Grapevines under mild water stress, do not need
to completely close their stomata in order to avoid cavitation, therefore, photosynthesis
is not completely impeded, and the cost in terms of carbon assimilation is less than
expected for other species. |
| format | Artículo |
| id | uncu-11589 |
| institution | Biblioteca Digital - UNCUYO |
| language | Inglés |
| publishDate | 2018 |
| publisher | Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias
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| record_format | ojs |
| spelling | uncu-115892019-02-19T17:35:08Z The phenomenon of cavitation in grapevine… : unravelling implicated mechanisms El fenómeno de la cavitación en vid… : descifrando los mecanismos implicados Hugalde, Inés Bonada, Marcos Vila, Hernán Vid Xilema Potencial hídrico foliar Conductancia estomática Syrah Grenache Cavitation Stomatal conductance Mechanistic model Cavitación en vid Xilema de las plantas Conductancia hidráulica Modelo mecanístico Cavitation is a physiological dysfunction that takes place in the xylem of water stressed plants. It leads to a loss of hydraulic conductance (kL) as the vessels are filled with air. This impacts water supply, water potential (ΨL) and canopy hydration. Stomatal clossure is an effective response upon diminishing momentary or seasonal foliar hydraulic contents. Depending on each type of plant, stomata may close preventing catastrophic cavitations. This research intended to understand how stomatal control acts upon cavitation events in two contrasting grapevine varieties, Syrah and Grenache. A mechanistic was developed model based on the water and vapour fluxes, kL, stomata conductance (gs), and the vulnerability to cavitation of the xylematic tissue. The theoretical model explains how plants respond to drought and avoid catastrophic cavitation. Water stressed grapevines couple their gs with their kL in order to avoid embolism. It is not stomatal closure, by istself, the controlling mechanism. Grapevines under mild water stress, do not need to completely close their stomata in order to avoid cavitation, therefore, photosynthesis is not completely impeded, and the cost in terms of carbon assimilation is less than expected for other species. La cavitación es una disfunción fisiológica que ocurre en el xilema de las plantas bajo déficit hídrico, y que entraña una pérdida de su conductancia hidráulica (kL), cuando algunos vasos se llenan de aire. Esto incide negativamente sobre la oferta de agua y afecta el potencial hídrico foliar (ΨL) y la hidratación de la canopia. El cierre estomático es una respuesta efectiva ante la disminución del contenido hídrico. Dependiendo de la especie vegetal, los estomas suelen cerrase para evitar la cavitación catastrófica. Mediante un modelo mecanístico, que se construyó teniendo en cuenta los flujos de agua y vapor, las kL y conductancia estomática (gs), y la vulnerabilidad del xilema a cavitar; se probó que gs no es la única variable responsable de frenar la embolia. Se determinó que gs y kL están íntimamente asociadas y que este acople entre ambas conductancias es lo que frena la embolia. Se concluyó que, en la vid y bajo niveles de estrés hídrico moderado, no es necesario un cierre estomático para controlar la cavitación. Por esto, el mecanismo de control de la cavitación en la vid no conlleva un costo en términos de intercambio gaseoso. Fil: Hugalde, Inés. Instituto Nacional de Tecnología Agropecuaria (Argentina). Estación Experimental Agropecuaria Mendoza. Fil: Bonada, Marcos. South Australian Research and Development Institute Fil: Vila, Hernán. Instituto Nacional de Tecnología Agropecuaria (Argentina). Estación Experimental Agropecuaria Mendoza. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias 78 Revista de la Facultad de Ciencias Agrarias Vol. 50, no. 2 Revista de la Facultad de Ciencias Agrarias, Vol. 50, no. 2 2018-12-18 eng Inglés http://bdigital.uncu.edu.ar/11479 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar/ article info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias http://bdigital.uncu.edu.ar/11589 |
| spellingShingle | Vid Xilema Potencial hídrico foliar Conductancia estomática Syrah Grenache Cavitation Stomatal conductance Mechanistic model Cavitación en vid Xilema de las plantas Conductancia hidráulica Modelo mecanístico Hugalde, Inés Bonada, Marcos Vila, Hernán The phenomenon of cavitation in grapevine… : unravelling implicated mechanisms |
| title | The phenomenon of cavitation in grapevine…
: unravelling implicated mechanisms |
| title_full | The phenomenon of cavitation in grapevine…
: unravelling implicated mechanisms |
| title_fullStr | The phenomenon of cavitation in grapevine…
: unravelling implicated mechanisms |
| title_full_unstemmed | The phenomenon of cavitation in grapevine…
: unravelling implicated mechanisms |
| title_short | The phenomenon of cavitation in grapevine…
: unravelling implicated mechanisms |
| title_sort | phenomenon of cavitation in grapevine…
: unravelling implicated mechanisms |
| topic | Vid Xilema Potencial hídrico foliar Conductancia estomática Syrah Grenache Cavitation Stomatal conductance Mechanistic model Cavitación en vid Xilema de las plantas Conductancia hidráulica Modelo mecanístico |
| url | http://bdigital.uncu.edu.ar/11589 |