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Screen of Rice Varieties for Resistance to Xanthomonas oryzae pv. oryzae in Taiwan
The reaction between the highly resistant varieties of rice selected from field screening test and 17 Taiwanese isolates of Xanthomonas oryzae pv. oryzae in the field trial
The reaction between the highly resistant varieties of rice selected from field screening test and 17 Taiwanese isolates of Xanthomonas oryzae pv. oryzae in the field trial

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 109-10cells/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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Journal of
Taiwan Agricultural Research
Vol. 72, No.3 (2023) ISSN: 2790-086X Vol. 72, No.3 (2023)
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