Comparative Anatomy of Tobacco Leaves and Flowers infected with various Viruses

Abstract

The tobacco leaves infected with viruses increase in size of the midribs and decrease in thickness of the blades, varying according to the sorts of viruses and the condition of the diseases. The stomata of the diseased leaves increase in size and decrease in number, showing no difference in them according to the sorts of viruses. The X-bodies are invariably found in the epidermal cells and hairs, and the size of nuclei varies inversely as that of the X-bodies.
The flowers are deformed morphologically and have X-bodies in the cell contents. The size of pollens varies with the sorts of viruses, and no difference in size of X-bodies is recognized. The X-bodies locomote in the germ-tubes in case of germination of the pollens.