To understand the genetic mechanism of the new rust resistance, we tested the expressions of four PR genes, including SA-dependent PR2 and PR5 and JA-dependent PR3 and PR10 (Van Loon and Van Strien, 1999) in a time-course study in the wild-type Cadenza and mutant L683F with Pgt TPMKC infection. The gene discussed is PRTN3; the disease is infection.