Some Effects induced in Nicotiana glutinosa by the ‘Aspermy’ Virus of Tomato

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Abstract
Inoculation of Nicotiana glutinosa with the virus causing ‘aspermy’ disease in tomato causes malformation of all parts, increased development of lateral branches, foliar and floral distortion, and reduced production of seed. Some anthers and ovaries become necrotic, but many undergo sporogenesis. At the first meiotic division the pachytene threads of some spore mother-cells exhibit collapse, accompanied by abnormal multiplication of nucleolar bodies; whilst pairing fails in one and sometimes two or three bivalents, resulting in a proportion of chromosome-deficient gemetes, with consequent production of miashapen pollen-grains, together with microcytes.

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