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NaCl effect on Cd accumulation and cell compartmentalization in barley

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Abstract

The effect of sodium chloride (NaCl) on cadmium (Cd) tolerance, uptake, translocation, and compartmentation was investigated in 3 barley genotypes. Seedlings were cultivated hydroponically in the absence of NaCl and Cd (control), in the presence of 50 mM NaCl alone, in the presence of 10 µM Cd alone, and in the combined addition of NaCl (50 mM) and Cd (10 µM). Plants were cultivated during one month under 16 h light period at a minimal light intensity of 250 µmol m−2 s−1, a temperature of 25 ± 3 °C, and 70–80% of relative humidity. Results showed that NaCl alone did not significantly affect plant development and biomass production; however, Cd alone reduced plant development rate leading to a decline in biomass production in Raihane and Giza 127 but did not affect that in Amalou. NaCl addition in Cd-treated plants accentuated the Cd effect on plant growth. NaCl limited Cd accumulation in the roots and in the shoots in all tested barley varieties by reducing Cd-absorption efficiency and the translocation of Cd from the root to the shoot. In all Cd-treated plants, cell Cd compartmentalization showed the following gradient: organelles < cell wall < vacuole. NaCl in the medium increased Cd accumulation in the soluble fraction and reduced that in organelle and cell wall fractions. Globally our results showed that, although NaCl reduces Cd accumulation in barley, it accentuates the Cd toxic effects, hence limiting the plant yield. We advise farmers to avoid barley cultivation near mine sites and its irrigation with moderately salty water, although this plant is considered as salt tolerant.

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Funding

This work was conducted in the Laboratory of Extremophile Plants (LR10CBBC02) in the Biotechnology Center of Borj Cedria, Tunisia, and supported by the ARIMNET 2 project entitled “Exploring genotypic diversity to optimize barley grain and straw quality under marginal/stressful growth conditions, BEST.” The authors acknowledge the support of the National Gene Bank of Tunisia.

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I.A., R.G., and A.B. conducted the experimental work (culture, analysis). C.A. and M.H. are members of the project and participated in the experimental set-up. I.A. writo the MS. T.G. is the supervisor of the work and responsible for the conception and the writing – review and editing of the MS.

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Correspondence to Tahar Ghnaya.

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The authors declare no competing interests.

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Responsible Editor: Elena Maestri

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Ayachi, I., Ghabriche, R., Zineb, A.b. et al. NaCl effect on Cd accumulation and cell compartmentalization in barley. Environ Sci Pollut Res 30, 49215–49225 (2023). https://doi.org/10.1007/s11356-023-25791-2

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  • DOI: https://doi.org/10.1007/s11356-023-25791-2

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