Has anybody confirmed presence of N-gene of resistance to TMV in tobacco accession CV-58 (PI 551316 Nicotiana tabacum L. SC 72, NC403, T.W. Graham, J.F. Chaplin, Z.T. Ford, R.E. Currin. 1974. Crop science. Madison, WI.. Crop Sci. (Madison) 14(4):606)?