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. 2004 Aug;167(4):1939-47.
doi: 10.1534/genetics.104.029371.

Allelic and haplotypic diversity at the rp1 rust resistance locus of maize

Shavannor M Smith  1 , Anthony J Pryor, Scot H Hulbert
Affiliations

Allelic and haplotypic diversity at the rp1 rust resistance locus of maize

Shavannor M Smith et al. Genetics. 2004 Aug.

Abstract

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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