Molecular Cloning, Characterization and Mapping of a Rhodanese Like Gene in Wheat

To isolate genes related to resistance to Erysiphe graminis (Blumeria graminis) DC. f. sp. tritici in wheat (Triticum aestivum L.), differential display analysis was conducted for mRNA extracted from seedlings of a wheat-Haynaldia villosa 6VS/6AL translocation line 92R137 that contains a powdery mildew resistance gene Pm21. A full-length cDNA sequence named TaTST (Triticum aestivum thiosulfate sulfurtransferase) homologous to the thiosulfate sulfurtransferase (rhodanese) in Datisca glomerata was isolated. Northern blot showed that the expression of TaTST was enhanced after infection with Erysiphe graminis. TaTST was mapped on the short arm of 6B chromosomes of wheat through Southern blot and GSP-PCR using Chinese Spring nullisomic/tetrasomic lines and ditelosomic lines. There is a homologue of TaTST on 6VS too.