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Effect of Temperature on Mottling of Soybean Seed Caused by Soybean Mosaic Virus. J. P. Ross, Plant Pathologist, Crops Research Division, ARS, USDA, P.O. Box 5397, Raleigh, North Carolina 27607. Phytopathology 60:1798-1800. Accepted for publication 17 July 1970. DOI: 10.1094/Phyto-60-1798.

Temperatures during flowering and especially early pod development were the most influential in affecting the development of mottling of seed from soybean mosaic virus (SMV)-infected plants of moderately and highly susceptible soybean genotypes. Exposure of infected plants to 20 C during this growth period caused the greatest percentage of seed coat mottling on both genotypes, whereas, exposures to 30 C significantly reduced mottling of seed of the susceptible genotype and virtually eliminated this symptom on the moderately susceptible cultivar. Nonmottled and mottled seed from SMV-infected plants transmitted the virus equally.

Additional keywords: Glycine max, anthocyanin.