Abstract
Oxygen-free hydration affords maximal protection against the post-irradiation oxygen-dependent (Class III) damage assessed as M 1 seedling injury, chromosomal aberrations and M 2 chlorophyll mutations. Heat shock and caffeine also eliminate part of this damage. When heat shock and caffeine are successively applied, the level of protection afforded by anoxic hydration is significantly reduced. Caffeine applied during anoxic hydratjion reduces the seedling injury to a much great extent than it reduces the frequency of chlorophyll mutations. The role of heat shock, under these conditions, is almost to reverse the ratio of seedling injury to chlorophyll mutations. The probable mechanism of action of caffeine as well as the implications of differential modification of the seedling injury and genetic damage are briefly discussed.
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