Virulence and Isozyme Differences for Establishing Racial Identity in Rusts of Maize

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Abstract
A new race of Puccinia sorghi virulent to maize possessing resistant genes Rpd, Rpf and RpTd was found in central Illinois [USA] in 1982. This race is designated race 2/Rp(d-f-Td) to distinguish it from race 1, already known throughout the Corn Belt, that is avirulent on maize with these resistance genes. Resistance gene Rpg conditioned a chlorotic fleck in seedlings to both races. Illinois races 1 and 2 were only distinguished on differential hosts and were indistinguishable in morphology, spore color, or reproductive growth rates on the plant. Illinois strains of races 1 and 2 were identical for 2 isozyme patterns, whereas a Wisconsin strain of race 1 was differentiated from these by both acid phosphatase and glucose-6-phosphate dehydrogenase banding patterns. P. polysora isozymes were readily distinguished from all P. sorghi biotypes.

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