Abstract
Winter rye grain, harvested in various years and exhibiting clearly differing viability. was studied. Higher total ribonucleolytic activity was found in the post-ribosomal supernatant than in the ribosomes themselves. The ribonucleolytic activity of cytoplasmic ribosomes declined as the germination ability of the rye grain decreased. A similar relationship was observed in the post-ribosomal supernatant. Two additional, in comparison with fully viable grain, ribosome-associated RNase activities (pH 5.0 and 8.3) were found in the grain with the lowest (2%) viability.
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