Distribution, Polymorphism and Function Characteristics of the GST-Encoding in .

Encoding a glutathione S-transferase (GST) and conferring resistance to Fusarium head blight (FHB), was successfully isolated from the newly assembled genome by researchers, with blasting searches revealing that gained through horizontal gene transfer from an endophytic species. On the contrary, our molecular evidence reveals that the homologs of are distributed commonly in . Other than , the homologs were also detected in four other genera, , , and , respectively. Sequence comparisons revealed that the protein sequences were at least 94% identical across all of the homologs in plants, which in turn suggested that the horizontal gene transfer of the might have occurred before differentiation instead of . The multiple homologs detected in some accessions and wheat- derivatives might be attributed to the alloploid nature and gene duplication during evolution. In addition, we discovered that some wheat- derivatives carrying the homologs had a completely different reaction to Fusarium head blight, which made us question the ability of the GST-encoding to resist FHB.