Abstract
Ultraviolet (UV) damages the plants by targeting the DNA, photosynthetic apparatus and a wide variety of physiological processes. Our recent study on ozone-induced cell death in tobacco cells propounded the involvement of reactive oxygen species (ROS) such as hydrogen peroxide (H2O2), singlet oxygen (1O2), and hydroxyl radical (HO•), and calcium signaling in the ozone-induced cell death induction. By analogy to the ozone-induced cell death, we attempted to evaluate the involvement of oxidative and calcium signaling mechanisms in UV-C (254 nm)-dependent cell death induction using both the ozone-sensitive and ozone-tolerant tobacco cells. Data suggested the involvement of ROS such as H2O2, HO•, 1O2 and superoxide (O2•-), enhancement of cell death by Fenton catalysts, and relay of signals mediated by calcium influx during the UV-induced cell death induction.
