Use of a Set of Differential Sorghum Inbred Lines to Compare Isolates of Sugarcane Mosaic Virus from Sorghum and Maize in Nine Countries. D. M. Persley, Department of Primary Industries, Plant Pathology Branch, Meiers Road, Indooroopilly, Queensland, Australia 4068. R. G. Henzell, Queensland Department of Primary Industries, Hermitage Research Station, Warwick, Queensland, Australia 4370; R. S. Greber, Department of Primary Industries, Plant Pathology Branch, Meiers Road, Indooroopilly, Queensland, Australia 4068; D. S. Teakle, Department of Microbiology, University of Queensland, St. Lucia, Australia; and R. W. Toler, Department of Plant Sciences, Texas A&M University, College Station 77843. Plant Dis. 69:1046-1049. Accepted for publication 16 January 1985. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-1046.

Eleven inbred sorghum lines (OK Y8, BTx3197, Atlas, Rio, BTx398, SA8735, NM31, SC0097-14E, Q7539, QL11, RTx430) were distributed to cooperators in nine countries. The reactions of selected johnsongrass-infecting isolates of sugarcane mosaic virus (SCMV-Jg) and maize dwarf mosaic virus (MDMV) on these sorghum lines indicated that the isolates could be grouped as follows: 1) the Australian SCMV-Jg, which alone produced a necrotic red stripe reaction on sorghums OK Y8 and SA8735, which have the dominant N gene; 2) isolates of SCMV-Jg and MDMV-A from the United States and Europe that produced systemic mosaic symptoms in OK Y8; and 3) the Venezuelan MDMV, which induced severe systemic necrosis in RTx430. QL11 with the Krish SCMV resistance source was highly resistant to all isolates within the three suggested groupings.