A Computer Program to Improve the Efficiency and Accuracy of Postulating Race-Specific Resistance Genes

Plant Disease
Yeshi A WamisheEugene A Milus

Abstract

Gene postulation has been the most widely used technique to determine the presence of particular rust resistance genes in lines of small grains. It applies the principles of gene-for-gene specificity to determine the most probable race-specific resistance genes present in host lines. As the numbers of lines, resistance genes, and races increase, postulation based on visual comparisons of infection types becomes more complex and laborious, and errors may occur. A computer program was developed to facilitate identification of race-specific leaf rust (Lr) genes in wheat (Triticum aestivum). Seedlings of 116 contemporary lines of soft red winter wheat and 24 Thatcher isolines (each Thatcher isoline with a single Lr gene) were inoculated with 22 races of Puccinia triticina. Infection types were recorded on the standard 0 to 4 scale where infection types 3 and 4 were considered high (line was susceptible; race was virulent) and others were low (line was resistant; race was avirulent). Based on the gene-for-gene concept, lines susceptible to a particular race cannot have an Lr gene for which the race is avirulent. For each line, step 1 of the program summarized results from races that were virulent on the line to definitively exclude ...Continue Reading

References

Jan 1, 1996·Annual Review of Phytopathology·J A Kolmer
Feb 1, 2004·Plant Disease·Yeshi A Wamishe, Eugene A Milus

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Citations

Oct 6, 2020·The Plant Genome·Ian G McNishKevin P Smith

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