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Revista Chapingo serie ciencias forestales y del ambiente

On-line version ISSN 2007-4018Print version ISSN 2007-3828

Abstract

RODRIGUEZ-SAUCEDA, Elvia N.; ARGENTEL-MARTINEZ, Leandris  and  MORALES-CORONADO, Denisse. Water regime and gas exchange of Prosopis laevigata (Humb. & Bonpl. ex Willd.) M. C. Johnst. in two semi-arid ecosystems in southern Sonora. Rev. Chapingo ser. cienc. for. ambient [online]. 2019, vol.25, n.1, pp.107-121.  Epub Feb 15, 2021. ISSN 2007-4018.  https://doi.org/10.5154/r.rchscfa.2018.09.068.

Introduction:

Among the adverse conditions of forest ecosystems, salinity and drought are the abiotic factors that largely modify the genetic and productive expression of species.

Objective:

To evaluate the effect of salinity and drought on the water regime and gas exchange of mesquite (Prosopis laevigata [Humb. & Bonpl. ex Willd.] M. C. Johnst.) in two semi-arid sites, Eco Camping and Bahía de Lobos, in southern Sonora, Mexico.

Materials and methods:

The water and osmotic potentials were determined in the root, stem and leaves of plants taken at random with similar morphological traits (height of 1.5 m and stem diameter of 0.15 m measured at 1.3 m). In addition, photosynthesis, transpiration and water-use efficiency were evaluated.

Results and discussion:

Water and osmotic potentials decreased significantly (P = 0.0043); the osmotic potential was the lowest in the three organs measured, forming a potential gradient, an aspect that explains the maintenance of transpiration in both conditions (salinity and drought). Photosynthesis did not vary significantly, but transpiration did. In both sites, water-use efficiency exceeded 6 μmol CO2/H2O; however, there was greater efficiency in the saline ecosystem due to the transpiration decrease.

Conclusion:

Mesquite has the ability to tolerate the stressful conditions of salinity and drought in southern Sonora, showing less impact in water relations and gas exchange in the salinity condition.

Keywords : water potential; osmotic potential; water-use efficiency; salinity; drought.

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