Reactions of Maize Lines CarryingRpResistance Genes to Isolates of the Common Rust Pathogen,Puccinia sorghi

Abstract

Isolates of the common rust fungus, Puccinia sorghi, were collected from North America, Hawaii, and Africa, and their specific virulence phenotypes were tested using a collection of maize lines carrying different resistance genes. Although all of the isolates collected in 1988 had identical specific virulence phenotypes, the pathotypes collected in 1989 were phenotypically diverse. Maize lines, the resistances of which could not be differentiated by a previous collection of rust isolates of this fungus, usually could not be differentiated by these isolates