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United States Department of Agriculture

Agricultural Research Service

Title: Crown Rust Resistance in Hexaploid Oat Determined by Two Complementary Loci

item Bush, Arla
item Wise, Roger

Submitted to: Plant Genome Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: December 13, 1995
Publication Date: N/A

Technical Abstract: Crown rust, caused by Puccinia coronata, is the major fungal disease of oat. Resistance to crown rust is usually, but not always, controlled by single dominant genes in hexaploid oat (Avena sativa). We have examined seventy recombinant inbred lines derived from a cross between A. byzantina cv Kanota and A. sativa cy Ogle that differ in their responses to the two crown rust isolates, PC54 and PC59. Analysis of rust infection type data indicates that resistance in this population is not conferred by a single gene. Further analysis suggests that resistance is due to two major unlinked loci which are located on linkage groups 4 and 13 of the molecular map developed from this cross. Additionally, resistance to the two isolates could not be separated genetically, and so both complementary loci appear to be required for resistance to either isolate.

Last Modified: 4/22/2015
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