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- Title
临沧地区不同来源稻瘟病菌致病性分析.
- Authors
董丽英; 赵秀兰; 刘 沛; 刘树芳; 张先闻; 杨勤忠
- Abstract
[Objective] The study aimed to understand the virulence frequency and differentiated characteristics of pathogenicity of Pyricularia oryzae strains isolated from the major cultivated rice cultivars and the traditional upland rice varieties cultivated in Lincang area. [ Method] One-hundred and eight P. oryzae strains isolated from Lincang area were inoculated on 23 monogenic rice lines carrying different single blast resistance genes at the rice seedling stage by the artificial spraying method. [Result] The 26 P. oryzae strains isolated from major rice cultivars had a less than 20% of virulence frequency for the monogenic lines containing Piz, Piz-5, Pita, Pi5, Pi9 and Pita-2 genes. Moreover, the virulence frequency of 56 P. oryzae strains isolated from traditional upland rice varieties grown in Cangyuan county was lower than 20% for the monogenic lines carrying Pik-h, Piz-t, Pib, Pi5, Pi9, Pil 2 and Pill genes. In addition, the virulence frequency of 26 rice blast strains isolated from the traditional upland rice varieties grown in Zhenkang county was lower than 20% for the monogenic lines carrying Pii, Pik-h, Piz-t, Pib, Pish, Pil, Pi5, Pi9, Pi12, Pik-m and Pill genes. With the pathogenicity similarity coefficient as 0. 45, the 108 P. oryzae strains from different sources were divided into two lineages. [ Conclusion] The Pi5 and Pi9 genes were elite resources for improving modem cultivated rice cultivars in Lincang area. There was a significant difference in pathogenicity among the populations of P. oryzae isolated from the modem major cultivars and traditional upland rice varieties, whereas, lower pathogenicity differentiation was observed among the strains from Cangyuan county and Zhenkang county.
- Subjects
UPLAND rice; RICE; PYRICULARIA oryzae; CULTIVARS
- Publication
Southwest China Journal of Agricultural Sciences, 2023, Vol 36, Issue 12, p2729
- ISSN
1001-4829
- Publication type
Article
- DOI
10.16213/j.cnki.scjas.2023.12.018