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Background: Salinity is one of the major abiotic stresses affecting plantproduction in arid and semi-arid regions. It causes reduction of cultivablearea and combined with other factors, presents a serious threat to foodstability in these areas. Context: In front of this problem, the selection ofsalt tolerant species and varieties remains the best economic approach forexploitation and rehabilitation of salt-affected regions. Objective: Thepurpose of this study was to assess and compare the seed germination responseof six Acacia species under different NaCl concentrations in order to exploreopportunities for selection and breeding salt tolerant genotypes. Methods: Thesalinity effect was examined by measuring some agro-morphological parameters incontrolled growth environment using five treatment levels: 0, 100, 200, 300 and400 mM of NaCl. Results: The analyzed data revealed significant variability insalt response within and between species. All growth parameters wereprogressively reduced by increased NaCl concentrations. Growth in height, leafnumber and total plant dry weight were considered as the most sensitiveparameters. However, the growth reduction varied among species in accordancewith their tolerance level. It is important to note that all species survivedat the highest salinity (400 mM). Whereas A. horrida and A. raddiana wereproved to be often the best tolerant, they recorded the lowest reductionpercentage at this stage. Conclusion: The genetic variability found in thestudied species at seedling stage may be used to select genotypes particularlysuitable for rehabilitation and exploitation of lands affected by salinity.

Effect of sodium chloride (NaCl) on the growth of six Acacia species