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Plant Physiology 47:771-774 (1971)
© 1971 American Society of Plant Biologists

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Articles

Effects of Gamma Irradiation on Chromatin Activity of Sugar Beet Tissue 1

V. L. Dunham, B. C. Jarvis2, J. H. Cherry and C. T. Duda3

a Horticulture Department, Purdue University, Lafayette, Indiana 47907

Chromatin-associated RNA polymerase activity increases during washing of sugar beet tissue to a maximum by 20 hours. This increase was inhibited by dosages of gamma irradiation between 50 and 400 krad. Template availability, as measured by saturating levels of added Escherichia coli RNA polymerase, also increased with washing and was inhibited, although to a lesser extent, by the above irradiation dosages. Neither endogenous polymerase activity nor template availability was affected by high dosages (300 krad) in unwashed tissue. Exposure of tissue to irradiation (300 krad) at different times during a 20-hour washing period severely inhibited the development of RNA polymerase activity during the early stages of washing. The inhibition of template availability, however, was independent of time of irradiation. The data presented are discussed in relation to the mechanisms involved in the inhibitory effects of gamma irradiation on RNA production and subsequent protein synthesis.

2 Present address: Botany Department, University of Sheffield, Sheffield, England.

3 Present address: MSU/AEC Plant Research Laboratory, Michigan State University, East Lansing, Mich. 48823.

1 The research was supported by Atomic Energy Commission Contract (C00-1313-25). Journal Paper 3818 of the Purdue Agricultural Experiment Station.






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