THE HISTOLOGY OF THE NECROTIC LESIONS INDUCED BY VIRUS DISEASES |
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| Authors: | F. M. L. SHEFFIELD M.Sc. PH.D. F.L.S. |
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| Affiliation: | Department of Plant Pathology, Rothamsted Experimental Station, Harpenden, Herts |
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| Abstract: | About 12 hours after a leaf of Nicotiana glutinosa is inoculated with ancuba mosaic disease a band of necrotic material begins to form within the cell wall, usually between the lower epidermis and the spongy parenchyma. This band extends both laterally and towards the upper side of the leaf. At the same time, nuclear division is observed in the spongy parenchyma cells, but karyokinesis is not followed by cell division. As the necrotic mesh work extends the cells within it die and dry out. After about 3 days, the lesion consists of a meshwork of this necrotic material. The cells are all dead and the virus is isolated within the necrotic area, all interchange between the infected and healthy parts of the leaf having been prevented.
I am indebted to Fraulein Lina Cunow for assistance in making the preparations used in this study. |
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