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Effect of Manganese and Dimethylsulfoxide on Development of Tobacco Mosaic Virus Local Lesions in Phaseolus vulgaris. A. S. Dhaliwal, Assistant Professor, Department of Biology, Loyola University, Chicago, Illinois 60626; T. A. Rudd, Research Assistant, Department of Biology, Loyola University, Chicago, Illinois 60626. Phytopathology 60:1178-1182. DOI: 10.1094/Phyto-60-1178.

Attempts were made to determine the role of manganese, boron, and carbonate, and temp and light on the susceptibility of the bean leaves to tobacco mosaic virus (TMV) infection. Pinto and Scotia bean plants, supplied manganese and grown constantly at 21 C and 40 ft-c light intensity, were approximately 3 times more susceptible than the controls. Scotia under these conditions was more susceptible to TMV than Pinto. Dimethylsulfoxide (DMSO) at 0.05% concn with manganese treatment, 28 C and 200 ft-c light intensity at a day and night cycle of 14 hr light and 10 hr dark, caused approximately 2-fold increase in susceptibility as compared to other treatments. Pinto with DMSO and Scotia without DMSO treatment performed better than controls in hydroponic solutions with manganese. The results were significant at the 1% level.