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Genetics, Vol. 167, 1939-1947, August 2004, Copyright © 2004
doi:10.1534/genetics.104.029371
Allelic and Haplotypic Diversity at the Rp1 Rust Resistance Locus of Maize
Shavannor M. Smith*,
Anthony J. Pryor
and
Scot H. Hulbert*,1
* Department of Plant Pathology, Kansas State University, Manhattan, Kansas 66506
Commomwealth Scientific and Industrial Research Organization, Canberra, Australian Capital Territory 2601, Australia
1 Corresponding author: Department of Plant Pathology, 4024 Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS 66506-5502.
E-mail: shulbrt{at}plantpath.ksu.edu
The maize Rp1 rust resistance locus is a complex consisting of a family of closely related resistance genes. The number of Rp1 paralogs in different maize lines (haplotypes) varied from a single gene in some stocks of the inbred A188 to >50 genes in haplotypes carrying the Rp1-A and Rp1-H specificities. The sequences of paralogs in unrelated haplotypes differ, indicating that the genetic diversity of Rp1-related genes is extremely broad in maize. Two unrelated haplotypes with five or nine paralogs had identical resistance phenotypes (Rp1-D) encoded in genes that differed by three nucleotides resulting in a single amino acid substitution. Genes in some haplotypes are more similar to each other than to any of the genes in other haplotypes indicating that they are evolving in a concerted fashion.
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