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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.