Biologia Plantarum

, Volume 51, Issue 4, pp 735–740 | Cite as

Daily variations in water relations of apricot trees under different irrigation regimes

  • M. C. Ruiz-Sánchez
  • R. Domingo
  • A. Pérez-Pastor
Original Papers


Mature apricot (Prunus armeniaca L. cv. Búlida) trees, growing under field conditions, were submitted to two drip irrigation treatments: a control (T1), irrigated to 100 % of seasonal crop evapotranspiration (ETc), and a continuous deficit (T2), irrigated to 50 % of the control throughout the year. The behaviour of leaf water potential and its components, leaf conductance and net photosynthesis were studied at three different times during the growing season, when they revealed a diurnal and seasonal pattern in response to water stress, evaporative demand of the atmosphere and leaf age. The deficit-irrigated trees showed, among other effects, a pronounced decrease in leaf water potential (ψw), decreased in leaf conductance (gs) and no osmotic adjustment. For this reason, gl and ψw can be considered good indicators of mature apricot tree water status and can therefore be used for irrigation scheduling.

Additional key words

leaf stomatal conductance leaf water potential net photosynthesis Prunus armeniacawater deficit 



internal CO2 concentration


crop evapotranspiration


reference evapotranspiration


leaf stomatal conductance


leaf mass/leaf area ratio


photosynthetically active radiation


net photosynthetic rate


water saturated mass/dry mass ratio


leaf temperature


vapour pressure deficit


leaf osmotic potential


leaf osmotic potential at full saturation


leaf pressure potential


leaf water potential


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Copyright information

© Institute of Experimental Botany, ASCR 2007

Authors and Affiliations

  • M. C. Ruiz-Sánchez
    • 1
    • 3
  • R. Domingo
    • 2
    • 3
  • A. Pérez-Pastor
    • 2
    • 3
  1. 1.Dpto. RiegoCentro de Edafología y Biología Aplicada del Segura, CSICMurciaSpain
  2. 2.Dpto. Producción VegetalETSIA-UPCTCartagenaSpain
  3. 3.Unidad Asociada al CSIC de Horticultura Sostenible en Zonas ÁridasUPCT-CEBASCartagenaSpain

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