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Yarwood1) found that heat treatments of bean leaves before or after inoculation with some viruses result in an increase in the number of local lesions. The possibility has been discussed by some workers2,3,4,5,6) that ectodesmata and plasmodesmata are important for initiation of virus infection. Brants3) demonstrated a close relationship between the number of ectodesmata visible after fixation and susceptibility of tobacco and bean leaves to TMV infection. Thomas and Fulton6) reported that darkening and heat treatments increased susceptibility of T.I. 245 tobacco to TMV infection and also increased the number of ectodesmata. On the other hand, Kontaxis and Schlegel7) described the accumulation of TMV particles on the basal septa of broken leaf hairs in some Nicotiana plants. Herridge and Schlegel8), and Brants4) studied the reactions of some hypersensitive hosts after inoculation with 14C-labeled TMV, and found that the accumulations of radioactive virus material were associated with hair bases. We have made some tests to ascertain the correlation of the number of ectodesmata and plasmodesmata visible after fixation with the susceptibility of Nicotiana glutinosa L. leaves to initial infection by ordinary strain of TMV.

Correlation of Ectodesmata and Plasmodesmata Numbers with Susceptibility of Nicotiana glutinosa Leaves to Initial Tobacco Mosaic Virus Infection