| Eighteen blast isolates were obtained from a hybrid combination Wuyou308 using the Magnaporthe
oryzae pathogen isolation method. Race identification of these isolates was conducted based on 7 Chinese blast
differentials and 11 blast monogenic lines. The results indicated that the isolates were identified as the race of ZB13,
ZB15, ZC13, accounting for 66.67%, 27.78%, 5.56%, respectively, the resistance genes including Pi-ta2, Pi-sh, Pi-i
were highly susceptible to these isolates, while the resistance genes like Pi-kh, Pi-1, Pi2, Pi-9 and Pi-50 showed
good resistant to tested pathogens. All isolates were compatible to the original rice of hybrid Wuyou308. Three
isolates like GDHY-308-1401 and so on were used for testing their pathogenicities to 45 local varieties. The results
demonstrated that 13 varieties appeared highly susceptible to the tested isolates, accounting for 28.89%; two varieties
appeared moderately susceptible to the tested isolates, accounting for 4.44%; 30 varieties appeared moderately/highly
resistance, accounting for 66.67%. Among them, some of new hybrid combinations such as Wufengyou9802, Wuyou613,
Wuyou1179 showed good resistance to the inoculated strains, they were recommended to be the candidates in the rice
region where Wuyou308 showed susceptibility |
