1932

Abstract

The and rust-resistance genes, representing two of the five rust-resistance gene loci in flax (), have been cloned. The molecular data are fully consistent with earlier genetic data: the locus is a single gene with multiple alleles expressing different rust resistance specificities, and the locus is complex, containing an array of about 15 similar genes. Thus, while and resistance genes have 86% nucleotide identity, their locus structure is very different. These genes encode products belonging to the nucleotide binding site–leucine-rich repeat class of disease-resistance proteins. Analysis of alleles from the locus and chimeric genes is providing evidence suggesting that important specificity determinants occur in the C-terminal half of the proteins, the region containing the leucine-rich repeats. The isolation and characterization of the rust () avirulence genes that correspond to the cloned rust-resistance genes is one of the major challenges remaining to the understanding of this system.

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/content/journals/10.1146/annurev.phyto.35.1.271
1997-09-01
2024-10-04
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  • Article Type: Review Article
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