Use of a Set of Differential Sorghum Inbred Lines to Compare Isolates of Sugarcane Mosaic Virus fromSorghumand Maize in Nine Countries

Abstract

Eleven inbred sorghum lines (OKY8, 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 OKY8 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 OKY8; 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.