Abstract
The ratio of numbers of virus nucleoprotein to protein particles in Chinese cabbage plants infected with turnip yellow mosaic virus (TYMV) remained close to 2:1 under a wide range of growing conditions. This ratio did not change significantly from the earliest stage of infection at which crystalline virus could be isolated to the time when plants contained maximal amounts of virus, and were approaching senescence. Total ribonucleic acid (RNA) content of healthy and infected Chinese cabbage leaf tissue was examined by a method involving very little loss of polyribonucleotides. Healthy leaf tissue may contain up to 3 mg/g fresh weight of RNA. In leaves infected with TYMV the total RNA is increased. The increase over comparable healthy leaf is entirely accounted for by the amount of virus RNA that can be isolated in combination with the virus protein antigen.
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