Abstract
ABSTRACTSome agricultural regions in large areas deficient in Boron (B) also present a risk of contamination of soils with excess mercury (Hg). The purpose of this study was to explore whether Hg stress induces programmed cell death (PCD) in tobacco BY-2 (Nicotiana tabacum L. cv. Bright Yellow-2) cells and the influence of B deprivation on mercury (Hg) stress-induced PCD. It was shown that the BY-2 cells exposed to 30 μM mercury chloride (HgCl2) underwent PCDand in the meantime, the expression changes of PCD-related genes were found. Meanwhile, Hg stress in combination with B deprivation can cause much higher proportion of cells to undergo PCD than Hg stress alone. Accompanied with PCD, the HgCl2-stressed cells under B deprivation accumulated more H2O2 and lipid peroxides than control cells. Our results suggest that HgCl2 can induce PCD in tobacco BY-2 cells, that B deficiency would enhance this effect, and oxidative damage is directly involved in the PCD process.
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