Physiological Race Indentification Of Melamposora Larici-Populina Kleb.

Melampsora larici-populina Kleb., is also called populus cathayana leaf rust, widely distributes in various poplar planting areas in the world, which do harm to Tacamabaca, Aigeros, and their hybrids, even to the Diversiform-leaved poplar.It is a kind of plant disease, which distributes broadly, disserves furthest, mainly distributes in northeast, northwest, North China and the southwest in China.In this paper, fifteen Melampsora larici-populina Kleb. isolates were researched through the respective test on host distinction and IGS analysis. The isolates came from certain regions of seven provinces or cities in different years and different lots in our country.The main conclusions as following:(1) Through the respective test on host distinction as well as observation as to in-cubation period and sporulation to further confirm physiological race differentiation of Melampsora larici-populina Kleb. in our country,13 out of 15 belonged to 4 physiological races respectively;Th₀₅₃,Sb and Cj₀₅₂ went to No.1 physiological race,CMLP1; Ts₀₆,Gl₀₅₁,Hb_05-1 and Sb₀₅₂ fell into No.2 physiological race,CMLP₂;Qh₀₆₃,Gl₀₅₂, Hdao and Sb₀₅₁ into No.3 physiological race,CMLP₃;Bq and Qh₀₆₁ to No.5 physiologic-al race,CMLP₅;and By_05-3 and Zs into a pathogenesis type temporarily.(2) The aimed bandings of IGS1 for the 15 strains was in the identical position and had no difference in size.The 15 strains IGS1 were highly conservative. There were no difference available in the physiological race, inter- physiological race.The research furtherly proved Melampsora larici-populina Kleb. had the physiological race differentiation in China, the DAN polymorphism and origination of the strains had no obvious relevance, the pathogenicity and DNA polymorphism also had no obvious relevance.