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Seasonal changes in leaf water potential components in two almond cultivars

Published online by Cambridge University Press:  27 March 2009

M. C. Ruíz-Sánchez ,
M. J. Sánchez-Blanco ,
J. Planes ,
J. J. Alarcón  and
A. Torrecillas
M. C. Ruíz-Sánchez
Affiliation:
UEI Riego Localizado, Centro de Edafologia y Biología Aplkada del Segura (CSIQ), PO Box 4195, E–30080 Murcia, Spain
M. J. Sánchez-Blanco
Affiliation:
UEI Riego Localizado, Centro de Edafologia y Biología Aplkada del Segura (CSIQ), PO Box 4195, E–30080 Murcia, Spain
J. Planes
Affiliation:
UEI Riego Localizado, Centro de Edafologia y Biología Aplkada del Segura (CSIQ), PO Box 4195, E–30080 Murcia, Spain
J. J. Alarcón
Affiliation:
UEI Riego Localizado, Centro de Edafologia y Biología Aplkada del Segura (CSIQ), PO Box 4195, E–30080 Murcia, Spain
A. Torrecillas
Affiliation:
UEI Riego Localizado, Centro de Edafologia y Biología Aplkada del Segura (CSIQ), PO Box 4195, E–30080 Murcia, Spain
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Summary

Almond trees (Amygdalus communis L. cvs Garrigues and Ramillete) were grown in the field under non-irrigated conditions in Murcia, Spain. Seasonal variations in leaf water potential components were studied in 1989. Predawn leaf water potential showed high values in both cultivars, due to the absence of soil water stress. Pressure-volume curve analysis indicated that the leaf osmotic potential at full saturation (Ψo(sat)) for cv. Garrigues remained fairly constant throughout the season. Bulk modulus of elasticity (E) showed, in both cultivars, a tendency to decrease as the season progressed. E values were higher in Ramillete than in Garrigues. The relative water content at the turgor loss point (RWCtlp) seemed to be controlled by E values. The larger relative apoplastic water content (RWCa found in Ramillete might have allowed it to retain more water at low leaf water potentials than Garrigues. These facts would support the suggestion that Ramillete is a more drought-resistant cultivar than Garrigues.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 120 , Issue 3 , June 1993 , pp. 347 - 351
Copyright
Copyright © Cambridge University Press 1993

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