Effects of gamma Radiation on Lichens and Lichen-Forming Fungi and Algae.

摘要

Initial literature reports indicated that lichens were highly resistant to gamma radiation. A series of experiments were undertaken to determine why lichens were so resistant. In experiments with Cladonia mitis, C. sylvatica, C. verticillata, Parmelia sulcata and P. subaurifera,using both acute and chronic radiation,it was found that these lichens were not highly resistant to gamma radiation. The lichens appeared to be resistant as long as they were in a dormant condition. But,when allowed to pass through a period which was suitable for growth,radiation damage was quickly manifested. Radiation damage was seen in various ways,including the change of thallus color,disintegration of phycobiant chloroplastids,coalescing of fungal hyphae,reduced CO sub 2uptake,and reduction in thallus tensile strength. (ERA citation 02:061028)