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Adult Plant Phenotype of the Rp1-DJ Compound Rust Resistance Gene in Maize

March 1997 , Volume 87 , Number  3
Pages  236 - 241

G. Hu , C. A. Webb , and S. H. Hulbert

Department of Plant Pathology, Kansas State University, Manhattan 66506-5502

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Accepted for publication 3 December 1996.

The complex structure of the rp1 rust resistance locus of maize allows two or more resistance genes to be recombined together in coupling phase. The phenotypic effects of the Rp1-DJ compound gene, which carries both Rp1-D and Rp1-J, were analyzed. The Rp1-DJ compound gene was associated with a chlorotic spotting phenotype in some genetic backgrounds. At the seedling stage, lines carrying Rp1-DJ are fully susceptible to Puccinia sorghi biotype HI1, which is virulent on lines with the two genes singly. At later stages of growth, however, Rp1-DJ lines show partial resistance when compared with sibling lines not carrying the compound gene. The Rp1-DJ gene also confers partial resistance to P. polysora in adult plants.

Additional keywords: durable resistance, lesion mimic.

© 1997 The American Phytopathological Society