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Subcellular distribution and chemical forms of Co2+ in three barley genotypes under different Co2+ levels

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Abstract

The toxicity of many heavy metals in plants is closely associated with its subcellular distribution and chemical forms. The subcellular distribution and chemical forms of cobalt (Co2+) were investigated using 3 barley genotypes differing in Co2+ toxicity resistance, namely Yan66 (resistant), Ea 52 (sensitive), and Humai 4 (moderate), under two Co2+ levels (25 and 100 µM). Higher Co2+ level in cultural solution significantly increased Co2+ accumulation in all subcellular fractions, with vacuole and cell wall having higher concentration. In comparison with 25 µM Co2+, 100 µM Co2+ treatment caused significant increase of Co2+ concentration in the forms of F-NaCl (extracted with 1 M NaCl), F-Ac (extracted with 2% HAc), F-HCl (extracted by 0.6 M HCl), and F-residue (residue forms) in both shoots and roots. There was a significant difference among genotypes in Co2+ subcellular distribution and chemical forms, with Ea52 accumulating more Co2+ in organelles and Yan66 accumulating more Co2+ in vacuole and cell wall. Moreover, the inorganic form of Co2+ extracted with 80% ethanol (F-ethanol) and water-soluble form (F-H2O) were significantly increased in Ea52, while Yan66 accumulated more Co2+ in the forms of low-bioavailable molecules (F-NaCl, F-HAc, and F-HCl). The results suggest that the vacuolar sequestration and cell wall deposition of Co2+ is a key resistant mechanism for genotype Yan66.

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Acknowledgements

This research was supported by the Natural Science Foundation of China (31330055) and China Agriculture Research System (CARS-05).

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Correspondence to Guoping Zhang.

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Communicated by E Schleiff.

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Lwalaba, J.L.W., Zvobgo, G., Mwamba, M. et al. Subcellular distribution and chemical forms of Co2+ in three barley genotypes under different Co2+ levels. Acta Physiol Plant 39, 102 (2017). https://doi.org/10.1007/s11738-017-2400-2

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  • DOI: https://doi.org/10.1007/s11738-017-2400-2

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