A Limit in the Use of Predawn Leaf Water Potential for Tree Irrigation

Améglio, Thierry; Archer, P.; Cruiziat, P.; Daudet, F.A.; Valancogne, C.; Dayau, Sylvia; Cohen, M.

doi:10.17660/actahortic.1997.449.60

Cited by 77 publications

(91 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…on the one hand and the species (distribution of the easiest pathways between a given point, injection point, and the rest of the tree) on the other hand. In split-root experiments [5,45,62] part of the roots of a plant is in a dry soil compartment, the rest being in a well-watered soil. Under these conditions, which in fact, reproduce what happens for the root system of a tree in a drying soil, the whole shoot and not just part of it, is supplied with water.…”

Section: Qualitative Characteristics Of the Hydraulic Architecturementioning

confidence: 99%

“…Some vulnerability curves for roots have been published [5,67,111], which show that the root xylem in woody plants is generally more vulnerable to cavitation than shoots of the same individuals (see references in [95]). Because of their great susceptibility to cavitation, small roots have been called the "Achilles' heel" for water transport within the plant [51].…”

Section: Examples Of Vulnerability Curvesmentioning

confidence: 99%

See 1 more Smart Citation

Hydraulic architecture of trees: main concepts and results

2002

View full text Add to dashboard Cite

-Since about twenty years, hydraulic architecture (h.a.) is, doubtless, the major trend in the domain of plants (and especially trees) water relations. This review encompasses the main concepts and results concerning the hydraulic of architecture of trees. After a short paragraph about the definition of the h.a., the qualitative and quantitative characteristics of the h.a. are presented. This is an occasion to discuss the pipe model from the h.a. point of view. The second part starts with the central concept of embolism and give a review of important experimental results and questions concerning summer and winter embolism. The last part deals with the coupling between hydraulic and stomatal conductances. It discusses the theoretical and experimental relationships between transpiration and leaf water potential during a progressive soil drought, the increase of soil-root resistance and its consequences in term of xylem vulnerability, the factors controlling the daily maximum transpiration and how stomates can prevent "run away embolism". In conclusion different kinds of unsolved questions of h.a., which can be a matter of future investigations, are presented in addition with a classification of trees behaviour under drought conditions. To end, an appendix recalls the notions of water potential, pressure and tension.hydraulic architecture / cohesion-tension theory / summer embolism / winter embolism / drought resistance Résumé -Architecture hydraulique des arbres : concepts principaux et résultats. Sans aucun doute, depuis une vingtaine d'années, l'architecture hydraulique (a.h.) est devenue une approche majeure dans le domaine des relations plantes-eau (et particulièrement pour les arbres). Cette revue présente les principaux concepts et résultats concernant l'a.h. Après un bref paragraphe sur la définition de l'a.h., les caractéristiques qualitatives et quantitatives définissant l'a.h. sont passées en revue. À cette occasion le « pipe model » est discuté du point de vue de l'a.h. La seconde partie commence avec le concept central d'embolie et continue avec une présentation des principaux résultats et questions touchant l'embolie estivale et l'embolie hivernale. La dernière partie analyse le « couplage » entre les conductances hydraulique et stomatique. Il y est discuté des relations théoriques et expérimentales entre la transpiration et le potentiel hydrique foliaire durant la mise en place d'une sécheresse progressive du sol, de l'augmentation de la résistance sol-racines et de ses conséquences en terme de vulnérabilité du xylème, des facteurs contrôlant la transpiration maximale journalière et de quelle manière les stomates peuvent prévenir l'emballement de l'embolie. La conclusion fait état de différentes questions non résolues, qui pourraient faire l'objet de recherches futures et esquisse une classification du comportement des arbres vis-à-vis de la sécheresse. Pour finir, un appendice rappelle les notions de potentiel hydrique, de pression et de tension.architecture hydraulique / théorie de la cohé...

show abstract

Section: Qualitative Characteristics Of the Hydraulic Architecturementioning

confidence: 99%

Section: Examples Of Vulnerability Curvesmentioning

confidence: 99%

Hydraulic architecture of trees: main concepts and results

2002

View full text Add to dashboard Cite

show abstract

“…Such small differences between irrigated and non-irrigated plants could be explained by the fact that the root systems of the trees were partially supplied by a restricted humid zone such as groundwater [52]. Plants submitted to drought of the whole root depth reached much lower values of Ψ pd.…”

Section: Plant Water Statusmentioning

confidence: 99%

“…This can be explained by the large range of Ψ soil, between −0.04 and −0.20 MPa during the season, with different values for stressed and non-stressed apple trees according to the irrigation management. However, studies on this topic suggested that predawn plant water potentials were not a consistent measurement for managing irrigation, especially under well-watered conditions [52,54]. Further to such limitation, for managing irrigation, Ψ stem should be preferred in case of anisohydric behaviour [55].…”

Section: Plant Water Statusmentioning

confidence: 99%

Influence of irrigation strategies on productivity, fruit quality and soil-plant water status of subsurface drip-irrigated apple trees

Chenafi

Monney

Arrigoni

et al. 2016

Fruits

View full text Add to dashboard Cite

-Introduction. The aim of this work was to study the effects of regulated deficit irrigation (RDI) on fruit yield, fruit weight and fruit quality parameters, as well as soil-plant water relations, in apple orchards under highfrequency subsurface drip irrigation in a region with a continental climate. Materials and methods. Four irrigation treatments were applied in 2010 and 2011 to apple trees cv. 'Gala': T1, no irrigation; T2, optimal irrigation except during summer; T3, optimal irrigation except during summer when RDI with a threshold for irrigation at −1.2 MPa midday stem water potential (Ψ stem) was utilised; T4, optimal irrigation. The soil water status and plant water status were followed over two growing seasons. Results and discussion. The irrigation treatments had no significant impact on fruit yield. However, compared with optimal irrigation (T4) and RDI (T3), the absence of irrigation in summer (T1, T2) induced low Ψ stem (< −1.2 MPa), decreased fruit size and slightly increased the soluble solid, vitamin C and polyphenol contents of the fruits. The RDI (T3) during summer allowed a water-use reduction of 47% without loss in fruit yield, fruit weight and fruit quality compared with the optimal irrigation (T4). Conclusion. The RDI treatment saved 47% water compared with optimal irrigation without negative impacts on yield and fruit quality. In the temperate conditions of Switzerland, Ψ stem, as well as Ψ soil, are well adapted for scheduling RDI in apple orchards.Keywords: Switzerland / apple / Malus domestica / irrigation scheduling / regulated deficit irrigation / water stress / phenolics / vitamin C Résumé -Influence de stratégies d'irrigation sur la productivité, la qualité des fruits et le statut hydrique sol-plante de pommiers arrosés en goutte à goutte enterré. Introduction. Le but de cette étude a été d'analyser les effets de la régulation déficitaire de l'irrigation (RDI), avec des applications d'eau en goutte à goutte enterré à fréquence élevée, sur le rendement en fruits, le poids des fruits, et la qualité des fruits, ainsi que sur les relations hydriques entre sol et plante sur des vergers de pommier sous un climat continental. Matériel et méthodes. Quatre procédés d'irrigation ont été appliqués aux pommiers (cv. 'Gala') en 2010 et 2011 : T1, témoin non irrigué ; T2, irrigation optimal à l'exception d'absence d'irrigation durant l'été ; T3, irrigation optimal à l'exception une restriction d'irrigation induisant un stress modéré durant l'été, avec un seuil fixé à -1.2 MPa de Ψ stem (irrigation déficitaire régulée, RDI) ; T4, irrigation optimale. L'impact de ces régimes sur le potentiel hydrique du sol (Ψ soil) et le potentiel hydrique du tronc (Ψ stem) a été suivi pendant deux saisons. Résultats et discussion. Les régimes d'irrigation n'ont eu aucun impact significatif sur le rendement en fruits. Toutefois, par rapport à l'irrigation optimale (T4) et RDI (T3), l'absence d'irrigation en été (T1, T2) induit des potentiels de tronc bas (Ψ stem < -1,2 MPa) et une diminution du poids des ...

show abstract

“…El potencial hídrico foliar es el indicador más utilizado para evaluar el estado hídrico de las plantas (Améglio et al, 1999;Hsiao, 1990). Sin embargo, su interacción con los niveles de conductancia foliar dificulta el establecimiento de valores umbrales para la programación del riego.…”

Section: Indicadores Del Estado Hídrico De Las Plantasunclassified

Estado actual de la programación del riego en limonero mediante medidas del estado hídrico

et al. 2007

View full text Add to dashboard Cite

Resumen: En el presente trabajo se realiza una revisión sobre aspectos relativos a la utilización de medidas continuas del estado hídrico del limonero en la programación del riego. Para ello, se analizó, la sensibilidad de distintos indicadores del estado hídrico medidos de forma continua o discontinua en las plantas, su significado fisiológico, la obtención de niveles de referencia de los indicadores y los primeros resultados sobre programación del riego. INTRODUCCIÓNLos procedimientos tradicionales de programación del riego se basan en estimas de la evapotranspiración de los cultivos (Allen et al., 1998) o bien en medidas de la humedad del suelo (Hanson et al., 2000). La determinación de la evapotranspiración de los cultivos suele llevar asociadas ciertas incertidumbres debido a los efectos de la arquitectura del dosel vegetal, fracción de suelo sombreado y manejo del suelo. La estima de la evapotranspiración de plantaciones jóvenes o en situaciones de activa proliferación de malas hierbas crea adicionales posibilidades de error. Además, la ubicación de los sensores de humedad del suelo debe realizarse teniendo en cuenta la distribución y densidad de raíces, lo que incrementa la incertidumbre cuando la humedad del suelo varía en tres dimensiones como es el caso del riego localizado.Recientemente, están adquiriendo una importancia creciente los esfuerzos encaminados a programar el riego en base a medidas del estado hídrico de las plantas (Goldhamer y Fereres, 2001). Estas ideas derivan del hecho de que ni las medidas de humedad del suelo, ni las estimas de la evapotranspiración de un cultivo reflejan de forma directa el estado hídrico de las plantas. Las propias plantas son el mejor indicador de su estado hídrico, ya que integran los efectos tanto del suministro de agua desde el suelo como de las condiciones climáticas (Jones, 2004). Además, los indicadores del estado hídrico basados en medidas en las plantas poseen la ventaja adicional de estar directamente relacionados con la productividad de los cultivos .En este trabajo se pretende realizar una revisión sobre la utilización de medidas del estado hídrico del limonero en la programación del riego, abarcando, esencialmente, aspectos tales como la sensibilidad de distintos indicadores del estado hídrico medidos de forma continua o discontinua, su significado fisiológico, la obtención de niveles de referencia de los indicadores y resultados sobre programación del riego.© Fundación para el Fomento de la Ingeniería del Agua

show abstract

A Limit in the Use of Predawn Leaf Water Potential for Tree Irrigation

Cited by 77 publications

References 0 publications

Hydraulic architecture of trees: main concepts and results

Hydraulic architecture of trees: main concepts and results

Influence of irrigation strategies on productivity, fruit quality and soil-plant water status of subsurface drip-irrigated apple trees

Estado actual de la programación del riego en limonero mediante medidas del estado hídrico

Contact Info

Product

Resources

About