VIEW ARTICLE

Resistance

Effects of Temperature on the Maintenance of Resistance to Soybean Mosaic Virus in Soybean. L. M. Mansky, Departments of Plant Pathology and Microbiology, Iowa State University, Ames 50011; D. P. Durand(2), and J. H. Hill(3). (2)(3)Departments of Plant Pathology and Microbiology, Iowa State University, Ames 50011. Phytopathology 81:535-538. Accepted for publication 20 December 1990. Copyright 1991 The American Phytopathological Society. DOI: 10.1094/Phyto-81-535.

The effects of temperature on naturally occurring disease resistance to soybean mosaic virus (SMV), strain G2, were studied by using resistant soybean lines PI 96983, L78-379, and Davis. When plants were shifted from 20 C to 10 C for 10 days, coat protein of SMV-G2 accumulated in trifoliolate leaves of resistant plants inoculated with SMV, but did not at the higher temperatures tested. Infectious SMV was recovered from these leaves by a local-lesion assay. Temperature had no apparent effect on the accumulation of coat protein of SMV-G2 in trifoliolate leaves of inoculated plants of the susceptible cultivar Williams ‘82. Moreover, temperature did not influence accumulation of coat protein in susceptible and resistant lines inoculated with a resistance-breaking strain, SMV-G7.