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Poor Seed Quality and Rugosity of Leaves of Virus-Infected Hood Soybeans. J. M. Dunleavy, Plant Pathologist, Crops Research Division, ARS, USDA, Department of Botany and Plant Pathology, Iowa State University, Ames 50010; S. S. Quiniones(2), and C. J. Krass(3). (2)(3)Professor of Plant Pathology; Graduate Assistant; and former Graduate Assistant, respectively, Department of Botany and Plant Pathology, Iowa State University, Ames 50010, (3)Present address: Department of Plant Pathology, University of California, Berkeley 94720. Phytopathology 60:883-886. Accepted for publication 30 December 1969. DOI: 10.1094/Phyto-60-883.

Mean percentage of germination of 17 seed lots of Hood soybeans collected from 11 states was 64, as opposed to 90 for a control seed lot selected for good quality and high germination. All Hood seed lots contained some cracked seed, but the control seed lot contained no cracked seed. The mean percentage of cracked seed for all Hood seed lots was 22. A correlation coefficient of 0.931 was calculated for electrical resistance of leachates from all Hood seed lots with a percentage of seeds with cracks. All field-grown Hood soybean plants grown from all seed lots showed symptoms similar to soybean mosaic, whereas no control plants showed symptoms. A virus was transmitted from field-grown Hood plants to greenhouse-grown Bansei soybean plants and to Phaseolus vulgaris, Dolichos lablab, and Cyamopsis tetragonoloba. Leaf cells of Bansei soybean plants infected with the virus from Hood plants contained densely stained circular inclusions, membrane-bound inclusions, and pinwheel inclusions in areas characterized by the occurrence of numerous vesicles. These structures were not observed in healthy leaf tissue.