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The wheat stripe rust fungus,  Puccinia striiformis  f. sp.  tritici  ( Pst ), does not have a known alternate host for sexual reproduction, which makes it impossible to study gene linkages through classic genetic and molecular mapping approaches. In this study, we compared 4,219  Pst  expression sequence tags (ESTs) to the genomic sequence of  P. graminis  f. sp.  tritici  ( Pgt ), the wheat stem rust fungus, using BLAST searches. The percentages of homologous genes varied greatly among different  Pst  libraries with 54.51%, 51.21%, and 13.61% for the urediniospore, germinated urediniospore, and haustorial libraries, respectively, with an average of 33.92%. The 1,432  Pst  genes with significant homology with  Pgt  sequences were grouped into physical groups corresponding to 237  Pgt  supercontigs. The physical relationship was demonstrated by 12 pairs (57%), out of 21 selected  Pst  gene pairs, through PCR screening of a  Pst  BAC library. The results indicate that the  Pgt  genome sequence is useful in constructing  Pst  physical maps.

comparative and functional genomics

Constructing Physical and Genomic Maps forPuccinia striiformisf. sp.tritici, the Wheat Stripe Rust Pathogen, by Comparing Its EST Sequences to the Genomic Sequence ofP. graminisf. sp.tritici, the Wheat Stem Rust Pathogen