| Popis: |
In nowadays low-dose ionising radiation can have a significant impact on humans and the environment, since it can occur in daily life from higher natural background radiation, rising anthropogenic pollution, medical, occupational, and accidental exposure. In the present study for the first time shown that low doses of external exposure due to tritium alters membrane electrical properties of Nitellopsis obtusa cell. Since it was also found that Nitellopsis obtusa cells expressed different bioelectrical response to tritium, aluminium and combined aluminium and tritium treatment, tritium could be considered as an important factor in the aluminium phytotoxicity expression. It was also revealed that signals about low-dose ionizing radiation from closed source or radioactive strontium induced effects could be transmitted from irradiated cell to unexposed neighbouring cell and cause changes in the bioelectrical activity of non target cell. These radiation induced bystander effects seems to occur due to signal transduction between two adjoining internodal cells through plasmodesmata. Obtained results showed that electrophysiological investigations could provide a useful tool in assessing the risk from low-dose ionizing radiation to a single plant cell in vivo, and also can be applied in radioecological monitoring of the environment and assessment of radiation exposure for non-human biota. |
