Pathogenicity of Pyricularia grisea and Xanthomonas oryzae pv. oryzae strains in Vietnam
Country
Viet Nam
Description
[Synopsis]
Rice blast and Bacterial leaf blight are the major diseases in the Mekong River Delta(MRD) of Vietnam. Although the cultivation of resistant varieties is the most promising method to control these diseases, race distribution of the causal pathogens, Pyricularia grisea(PG) and Xanthomonas oryzae pv. oryzae(Xoo), has not been studied in detail in Vietnam. Therefore, in this study we analyzed the pathogenic variability of isolates of these pathogens and the race distribution in Vietnam, especially in MRD. One hundred and twenty-nine monoconidial isolates of PG were classified into 12 pathogenic groups(races) based on the virulence to 12 Japanese differential varieties. Race 002.4 was predominant and was found in 10 provinces of MRD. Resistance genes, Pish, Piz-t and Pik-p were resistant to all isolates tested. On the other hand, fifty-two isolates of Xoo were classified into 6 pathogenic groups(races) based on the pathogenicity to the 18 differential varieties. More than 80% of the isolates were classified as rece A and the predominat race A distributed throughout Vietnam. Resistance genes, xa-5, Xa-7 and Xa-17, were resitant to all isolates tested. A breeding program was initiated to transfer these genes from differential varieties to high quality Vietnamese rice varieties to control the disease effectively.
- Affiliation
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Japan International Research Center for Agricultural Sciences Crop Production and Postharvest Technology Division
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Cuulong Delta Rice Research Institute
- Classification
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Technical A
- Term of research
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FY1995-1998
- Responsible researcher
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NODA Takahito ( Crop Production and Postharvest Technology Division )
DU Pham Van ( Cuulong Delta Rice Research Institute )
E Lai Van ( Cuulong Delta Rice Research Institute )
DINH Hoang Dinh ( Cuulong Delta Rice Research Institute )
- ほか
- Japanese PDF
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1998_09_A3_ja.pdf453.77 KB