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Tolerance to Barley Yellow Dwarf Virus in Oats. H. Jedlinski, Research Plant Pathologist, North Central Region, Agricultural Research Service, United States Department of Agriculture, and Assistant Professor, Department of Plant Pathology, University of Illinois, Urbana, IL 61801; W. F. Rochow(2), and C. M. Brown(3). (2)Research Plant Pathologist, Northeast Region, Agricultural Research Service, United States Department of Agriculture and Professor of Plant Pathology, Cornell University, Ithaca, NY 14850; (3)Professor of Agronomy, University of Illinois, Urbana, IL 61801. Phytopathology 67:1408-1411. Accepted for publication 19 May 1977. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-1408.

Disease severity was highly correlated with reduction in yield of three pairs of sister oat lines representing F7 generation progenies that transgressively segregated for marked tolerance and intolerance to barley yellow dwarf virus (BYDV) infection. Less BYDV was extracted from plants of each of the three tolerant lines than from plants of each of the three lines that lacked tolerance. These data show that meaningful direct tests of BYDV concentration can be used to study the mechanism of tolerance, which appears to involve a suppression of BYDV replication.

Additional keywords: aphids, cereal viruses.