Genetic Control of Disease Expression in Stem Rust of Wheat

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Abstract
In stem rust of wheat, susceptibility as measured by infection type may be genetically determined by the genotype of either the host or the pathogen. The absence of a locus due to aneuploidy is the equivalent of an allele for susceptibility. In the euploid the allele for susceptibility may be either a nonfunctional DNA sequence or, if functional, the gene product does not interact with the gene product of the corresponding definitive gene in the host. In some cases high temperature may change a definitive phenotype to nondefinitive.

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