Signal transduction in response to exposure to UV-B radiation is a complicated process in plants.
In this study we investigated the effects of enhanced UV-B radiation on chromosomes and microtubule arrays in wheat roots.
Seeds were treated with UV-B radiation of 10.08 kJ m-2 day-1.
The researchers estimate about 140,000 of the nearly 700,000 lakes in eastern Canada may have DOC concentrations low enough for UV-B penetration to be of concern.
The highest concern, they say, must be for clear, shallow lakes, streams and ponds, where even modest declines in DOC may eliminate the small regions that are deep enough to provide refuges from damaging UV-B radiation.
The study's authors say it seems possible that some of the many changes to aquatic communities that have been attributed to lake acidification may have involved harmful UV-B exposure.
The study indicates that declining amphibian species lack the ability to protect themselves from increasing UV-B radiation.
Blaustein is now planning to research whether other species and life stages besides eggs also suffer from UV-B radiation.
UV-B has reduced plankton production by six to 12 percent.
At the meeting, Happer angrily protested Watson's "exaggerations." He pointed out that during the Antarctic ozone hole the amount of UV-B light reaching the surface is far less than that reaching the surface at the equator.
Not only did Happer question the administration orthodoxy on ozone depletion, he also questioned how serious the biological effects of increased UV-B might be.
The results suggest that monocots, a large group of plants that includes grasses and lilies, tend to be more sensitive to UV-B
radiation than other species.