Abstract
The effect of turnip yellow mosaic virus (TYMV) infection on the growth of various parts of Chinese cabbage plants was studied in relation to virus synthesis, the production of leaf pigments and various macromolecules. Mild and severe strains of the virus affected overall growth to about the same extent, but growth form and distribution of chlorophyll were affected differently. Among the host components studied, the first to be affected by infection were chlorophyll and Fraction I protein. Late in infection the reduction of ribosomes and proteins on a weight/plant basis was about 20 times greater than the weight of virus produced. Dark green islands of tissue of the mosaic caused by a severe white strain of the virus made a significant contribution to the total chlorophyll of the diseased plant. The proportion of lamina that became dark green tissue in new leaves could be increased by removal of old expanded leaves that had escaped infection.
Published Version
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