Soost, P. K.
Progenies resulting from a cross of L. esculentum (var. Michigan State Forcing) with Hawaii Agricuiltural Experiment Station #2603, a derivative of (L. hirsutum x L. esculentum) x L. peruvianum, have segregated for resistance to Tobacco Mosaic virus. Progenies from crossing resistant segregates to susceptible plants have segregated approximately 1:1. Progenies from selling resistant backcross plants have segregated approxmately 2 resistant normal plants to 1 susceptible normal plant. In addition, all progenies from selfing backcross plants that have segregated for resistance have also segregated for the virescent mutant nv (see TGC7:13). No virescent plants have been recovered in progenies not segregating for resistance. Progeny from selfing one backcross plant had no susceptible plants, 15 resistant normal plants, and no virescent plants. Progenies from these plants have not as yet been tested. Although the data is not conclusive it appears that resistance is controlled by a single dominant gene closely linked with the virescent mutant nv. Dr. P. G. Smith has supplied segregation information from progenies he has grovn in connection with introducing this resistance into some of his breeding lines.