Abstract
The influence of a deficit-irrigation (DI) strategy on soil–plant water relations and gas exchange activity was analysed during a 3-year period in mature ‘Lane late’ (Citrus sinensis (L.) Osb.) citrus trees grafted on two different rootstocks, ‘Cleopatra’ mandarin (Citrus reshni Hort. ex Tanaka ) and ‘Carrizo’ citrange (C. sinensis L., Osbeck × Poncirus trifoliata L.). Two treatments were applied for each rootstock: a control treatment, irrigated at 100% ETc (crop evapotranspiration) during the entire season, and a DI treatment, irrigated at 100% ETc, except during Phase I (cell division) and Phase III (ripening and harvest) of fruit growth, when complete irrigation cut-off was applied. Under soil water deficit, the seasonal variations of soil water content suggested that ‘Cleopatra’ mandarin had a better root efficiency for soil water extraction than ‘Carrizo’ citrange. Moreover, in all years, trees on ‘Cleopatra’ reached a lower water-stress level (midday xylem water potential values (Ψmd) > −2 MPa), maintaining a better plant water status during the water-stress periods than trees on ‘Carrizo’ (Ψmd < −2 MPa). Similarly, net CO2 assimilation rate (A) was higher in trees on ‘Cleopatra’ during the water-stress periods. In addition, the better plant water status in trees on ‘Cleopatra’ under DI conditions stimulated a greater vegetative growth compared to trees on ‘Carrizo’. From a physiological point of view, ‘Cleopatra’ mandarin was more tolerant of severe water stress (applied in Phases I and III of fruit growth) than ‘Carrizo’ citrange.
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Acknowledgments
The authors thank I. M. García-Oller, M. Sánchez-Baños and A. J. Tristán for their help in both field and laboratory work. We also thank Dr. David Walker for correction of the English. This work was supported by a grant of the Instituto Nacional de Investigaciones Agrarias and by the Comisión Interministerial de Ciencia y Tecnología, through the projects AGL2000-2015-C03-03 and AGL2003-08502-C04-04.
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Communicated by S. Ortega-Farias.
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Pérez-Pérez, J.G., Romero, P., Navarro, J.M. et al. Response of sweet orange cv ‘Lane late’ to deficit irrigation in two rootstocks. I: water relations, leaf gas exchange and vegetative growth. Irrig Sci 26, 415–425 (2008). https://doi.org/10.1007/s00271-008-0106-3
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DOI: https://doi.org/10.1007/s00271-008-0106-3