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Seed Transmission and Distribution of Tobacco Streak Virus in Six Cultivars of Soybeans. A. M. Ghanekar, Department of Plant Pathology, Kansas State University, Manhattan 66506; F. W. Schwenk, Department of Plant Pathology, Kansas State University, Manhattan 66506. Phytopathology 64:112-114. Accepted for publication 29 June 1973. DOI: 10.1094/Phyto-64-112.

Six soybean cultivars at three stages of growth were inoculated with isolates of tobacco streak virus (TSV), one from soybean (A-TSV) and the other from tobacco (W-TSV). For either isolate, all plant parts except pollen, embryos of immature seeds, and non-inoculated leaves that had developed prior to inoculation, consistently assayed positive for virus. Depending on the cultivar, 0 to 20% of the seedlings from immature seeds from A-TSV-infected plants contained A-TSV; the percentage was higher in seedlings from mature seeds. Differences in seed transmission were noted among cultivars (2.6 to 30.6%). Of the cultivars tested, ‘Wayne’ had the highest percentage of transmission. W-TSV was not transmitted through either mature or immature seeds.