biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 39:623-631, 1997 | DOI: 10.1023/A:1000943218256

Effects of water stress and rewatering on leaf water relations of lemon plants

M.C. Ruiz-Sánchez1, R. Domingo2, R. Savé3, C. Biel3, A. Torrecillas2
1 Departamento Riego y Salinidad, Centro de Edafología y Biología Aplicada del Segura (CSIC), Murcia, Spain
2 Departamento Ingeniería Aplicada, Escuela Politécnica Superior, Universidad de Murcia, Cartagena, Murcia, Spain
3 Departamento Tecnología Hortícola, Institut de Recerca i Tecnologia Agroalimentáries (IRTA), Cabrils, Barcelona, Spain

Potted two-year-old lemon plants (Citrus limon (L.) Burm. fil.) cv. Fino, growing under field conditions were subjected to drought by withholding irrigation for 13 d. After that, plants were re-irrigated and the recovery was studied for 5 d. Control plants were daily irrigated maintaining the soil matric potential at about -30 kPa. Young leaves of control plants presented higher leaf conductance (g1) and lower midday leaf water potential (Ψmd) than mature ones. Young leaves also showed higher leaf water potential at the turgor loss point (Ψtlp) than mature leaves. In both leaf types g1 decreased with increased vapour pressure deficit of the atmosphere. From day 1 of the withholding water, predawn and midday leaf water potentials (Ψpd and Ψmd) decreased, reaching in both cases minimum values of -5.5 MPa, with no significant differences between mature and young leaves. Water stress induced stomatal closure, leaf rolling and partial defoliation. No osmotic adjustment was found in response to water stress in either leaf type, but both were able to enhance the cell wall elasticity (elastic adjustment). After rewatering, leaf water potential recovered quickly (within 2 d) but g1 did not.

Keywords: Citrus limon; elastic adjustment; leaf conductance; osmotic potential; water deficit; water potential
Subjects: Citrus limon; conductance, leaf, water stress; elastic adjustment; lemon, water stress; osmotic potential, water stress; rewatering after water stress; stomatal conductance, water stress; water deficit; water potential, water stress; water stress, leaf conductance

Prepublished online: May 1, 1997; Published: December 1, 1997  Show citation

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Ruiz-Sánchez, M.C., Domingo, R., Savé, R., Biel, C., & Torrecillas, A. (1997). Effects of water stress and rewatering on leaf water relations of lemon plants. Biologia plantarum39(4), 623-631. doi: 10.1023/A:1000943218256
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