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Seed Transmission of a Brazilian Isolate of Soybean Mosaic Virus. M. D. M. Porto, Research Assistant, Department of Plant Pathology, University of Wisconsin, Madison 53706, Present address of senior author: Faculdade de Agronomia, UFRGS – Porto Alegre, RS, Brazil; D. J. Hagedorn, Professor, Department of Plant Pathology, University of Wisconsin, Madison 53706. Phytopathology 65:713-716. Accepted for publication 3 February 1975. DOI: 10.1094/Phyto-65-713.

A Brazilian isolate of the soybean mosaic virus (SMV) was consistently found in the embryos and cotyledons of mature soybean seeds. Seeds harvested from virus-infected plants of 12 different soybean cultivars were tested for transmission of the virus, mottling of the testa, and germination. Extent of mottling of the testa and seed transmission of the virus were dependent on the soybean cultivar. Neither the mottling nor presence of the virus had any effect on germination. Tests with mottled seeds produced by noninoculated soybean plants showed that mottling was not necessarily induced by virus infection.