A series of articles summarizing these studies has now been published in the Journal of Heredity. These describe widespread impacts, ranging from population declines to genetic damage to responses by the repair mechanisms that help organisms cope with radiation exposure.
"A growing body of empirical results from studies of birds, monkeys, butterflies, and other insects suggests that some species have been significantly impacted by the radioactive releases related to the Fukushima disaster," stated Dr. Timothy Mousseau of the University of South Carolina, lead author of one of the studies. Most importantly, these studies supply a baseline for future research on the effects of ionizing radiation exposure to the environment.
Common to all of the published studies is the hypothesis that chronic (low-dose) exposure to ionizing radiation results in genetic damage and increased mutation rates in reproductive and non-reproductive cells.
One of the studies (Hayashi et al. 2014) documented the effects of radiation on rice by exposing healthy seedlings to low-level gamma radiation at a contaminated site in Fukushima Prefecture.
After three days, a number of effects were observed, including activation of genes involved in self-defense, ranging from DNA replication and repair to stress responses to cell death. "The experimental design employed in this work will provide a new way to test how the entire rice plant genome responds to ionizing radiation under field conditions," explained Dr. Randeep Rakwal of the University of Tsukuba in Japan, one of the authors of the study.
계속ー> https://www.sciencedaily.com/releases/2014/08/140814124535.htm