Journal of Taiwan Agricultural Research

Author:Yih-Chang Chang and Lih-Jiuan Hsieh

Abstract:

    The purpose of this study is to screen rice varieties resistant to Xanthomonas oryzae pv. oryzae, the causal organism of rice bacterial blight. A total of 17 isolates of the bacterium was used as inocula to inoculate 111 rice varieties/lines in the fields through 5 crop seasons from 1996 to 1998. Fifteen hills of each tested varieties/lines were wounded-inoculated with the suspension of each bacterial isolate in a concentration of 10^9-10cells/ml by leaf clipping method. The results show that 5 bacterial isolates were more virulent and 15 rice varieties/lines were more resistant than others respectively. The virulent isolates included XF 17, XM 1, XH 2, XM 10 and XH 24-b. Whereas 15 tested varieties/lines showing highly resistant could be used as parents for rice breeding. They were IR 4442-46-3-3-3, IR 22, IR 22082-41-2, Malagkit songsong, IR 29, IR 30, IR 20?, IR 28, IR 20, Tainung sen 19, Chianung sen 6, IR 1514A, B 5354-5D-MR-1, IR 1545-339 and IR 26?. Among them, IR 20? and IR 26? were re-introduced from IRRI in 1992.

Key words:Rice variety, Bacterial blight of rice, Xanthomonas oryzae pv. oryzae, Races, Disease resistance

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