Some secrets of Argania spinosa water economy in a semiarid climate.

Argania spinosa is an example of an avoider tree growing under semi-arid conditions in Morocco. To assess what are the physiological strategies of this species, different variables were measured through an annual cycle in two populations located in the species' main distribution area. Results show the expected decrease of leaf water potential (psi) with an increase of water-use efficiency (A/gs) with the onset of the dry season.