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    Item type:Publication,
    Classification and diversity assessment of Pyricularia oryzae based on leaf and neck blast pathogenesis on Khao Dawk Mali 105
    (2020-01-01)
    Pradapphai, P.
    ;
    Parinthawong, N.
    Forty isolates of P. oryzae were obtained from disease outbreak areas in various regions of Thailand. The fungi were divided into two groups; group 1 included 2 isolates which cause only neck blast with disease score of 7 – 9 and group 2 included 23 isolates which cause leaf and neck blast symptoms with disease scores of 5 – 6 and 7 – 9, respectively. The two groups of fungi were tested on 31 NILs. The avirulence genes including Avr-Pik (Avr-Pik, Avr-Pikm, Avr-Pikp), Avr-Pi1, Avr-Pi3, Avr-Pi5(t), Avr-Pi7(t), Avr-Pi9, Avr-Pi20, Avr-Pii and Avr-Pita were found in both groups whereas Avr-Pi11, Avr-Pi12, Avr-Pi19, Avr-Pia, Avr-Pib, Avr-Pikh, Avr-Piks, Avr-Pish, Avr-Pita, Avr-Piz, Avr-Piz-5 and Avr-Piz-t were detected only in the group 2. The results explained the relationship between fungi and the avirulence genes functioned at different stages of rice.