Abstract
The modification of radiosensitivity of barley seeds with 11·1 per cent water content by caffeine and cysteine applied during oxygenated and oxygen-free hydration was studied. No post-irradiation oxygen-dependent damage develops in these seeds. While cysteine has no influence at all, caffeine effectively potentiates the level of the gamma-induced oxygen-independent (Class I) component of damage. The possible reactivity of caffeine and cysteine towards the precursors of oxygen-dependent and -independent components of damage in determining the mode and magnitude of modification has been briefly discussed.
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