Abstract:
From 1986 to 1990, typical physiological races from 7 localgroups were chosen, and the resistance spectrums for 768 rice varieties(strains) were determined. The resistance percentage of 34 varieties, constituting 4.4% of the total, was up to 80-100%, while that of 109 moderate resistance varieties, constituting 14.2% of the total was up to 60-79%. The other 625 varieties were susceptible. Moreover, 74 high resistance varieties were tested and divided by 10 races from the 7 groups. There were 4 types with resistance percentage up to 90%, and 3 types with resistance percentage up to 80%. According to the distribution of the dominant physiological races in different areas, resistant varieties were selected to facilitate variety rotation. The above results showed that the spectrum of resistance was relatively stable and had a practical value to production and breeding.
Key words:
Piricularia a-ryzae,
Resistance spectrum,
Resistance percentage
Chen Zengjian, Liu Shuifang, Liu Yixue. A Study on the Determination of the Resistance Spectrum for Rice Varieties(Strains) to Physiological Races of Piricularia aryzae[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1992, 7(2): 82-86. doi: 10.3321/j.issn:1000-7091.1992.02.015.