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Selection in vitro and accumulation of phytochelatins in cadmium tolerant cell line of cucumber (Cucumis sativus)

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Abstract

Cucumber (Cucumis sativus L.) cells from suspension culture were selected for their ability to grow and divide rapidly in toxic concentration of cadmium. As a result of selection a cell suspension tolerant to 100 μM cadmium chloride (CdCl2) was initiated. The selected tolerant line exhibited stable and repeatable increase in fresh and dry weight of cells in the presence of cadmium. The accumulated level of phytochelatins in cadmium sensitive (unselected) and tolerant cell line was measured by high performance liquid chromatography (HPLC) after 3, 24 h and 5 days of cadmium treatment. It was shown that in both cell lines Cd induced accumulation of phytochelatins and simultaneous glutathione depletion occurred. No distinct changes were found after 3 and 24 h of cadmium treatment whereas after 5 days of exposure to the metal, the level of phytochelatins was two times higher in the sensitive cell line as compared to the tolerant one. The accumulation of phytochelatins was correlated with cadmium concentration that increased in both cell lines during the course of cell exposure to metal. However, the level of cadmium was always lower in the tolerant cell line. The results showed no direct correlation between the tolerance of cucumber cells to Cd and the accumulated level of phytochelatins. Other mechanisms responsible for the increased tolerance of cucumber cells exposed to Cd are discussed.

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Abbreviations

BSO:

buthionine sulfoximine

GSH:

glutathione

HMW:

high molecular weight

LMW:

low molecular weight

PCs:

phytochelatins

SH:

thiol

SL:

sensitive line

TL:

tolerant line

TTC:

triphenyl tetrazolium chloride

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Correspondence to Edward A. Gwóźdź.

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Gzyl, J., Gwóźdź, E.A. Selection in vitro and accumulation of phytochelatins in cadmium tolerant cell line of cucumber (Cucumis sativus). Plant Cell Tiss Organ Cult 80, 59–67 (2005). https://doi.org/10.1007/s11240-004-8808-6

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  • DOI: https://doi.org/10.1007/s11240-004-8808-6

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