Abstract
Water relations, chlorophyll and proline content, and vegetative growth were obtained from three clingstone peach genotypes (S135,) grafted on peach × almond hybrid (GF 677,) rootstock (S135/GF 677) and seedling trees from S135 (SPTS135). The experiment was carried out under field conditions during the dry season (April–June) to evaluate the influence of the GF 677 rootstock on scion in 1997. Leaf water and osmotic potentials tended to be lower in S135/GF 677 than SPTS135 trees and irrigated seedlings peach trees (control). Although S135/GF 677 trees developed the lowest osmotic potential, the turgency was similar to SPTS135 trees. Relative water content and transpiration rate were the lowest in S135/GF 677 trees; SPTS135 trees were intermediate between S135/GF 677 and control trees. Chlorophyll and proline levels were increased in S135/GF 677 and SPTS135 trees compared with the control. Shoot growth was significantly delayed in S135/GF 677 trees compared with SPTS135 and control trees. Even though some scion physiological variables were modified by the GF 677, rootstock, the effect was not big enough to confer significant drought resistance to the scion.
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