Abstract
The effects are described of turnip yellow mosaic virus (TYMV) infection on the production of photosynthetic pigments in Chinese cabbage plants. Chlorophylls a and b and the four carotenoid pigments were analysed in plants following their infection with three strains of TYMV. The results support the view that infection reduces the amount of pigments in the plant mainly by inhibition of synthesis rather than by destruction of pre-existing pigments. In inoculated leaves, pale green and yellow green strains of the virus reduced the concentration of chlorophylls more than the carotenoids. A severe white strain of the virus reduced the concentration of all six pigments to a similar extent in all tissues tested.
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