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《Journal of Southwest China Normal University(Natural Science Edition)》 2008-04
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Physiologic Race Change of Pyricularia grisea and Identification of Blast Resistance of Hybrid Rice Varieties in Luzhou,Sichuan Province

ZHANG Zhi-dong~1 XIE Rong~2 LI Chun~1 LIU Cheng-yuan~2 LI Yong-hong~2 LIU Xue-mei~1 ZHOU Yan~1 1.Luzhou Plant Protection and Quarantine Station,Sichuan Luzhou 646000,China;2.Rice and Sorghum Research Institute,Sichuan Academy of Agricultural Sciences,Sichuan Luzhou 646000,China  
The change of physiologic races of the rice blast pathogen (Pyricularia grisea (Cooke) Sacc.) in the recent years and disease resistance of 50 rice hybrid varieties were monitored in Luzhou,Sichuan Prov- ince.Results indicated that the physiologic races of P.grisea were mainly ZA and the ZB groups in this area.The populations of ZA group increased annually from 2004 and its toxicity frequency was higher than that of the ZB populations and its pathogenicity was significantly stronger in the regions where rice blast occurred frequently than those regions where the disease occurred only accidentally.Among the 50 hybrid rices tested,17 (or 24% of the) varieties had a resistance frequency of more than 50~ and 4 varieies was resistant to more than 70% of the pathogen isolates.The disease scale of neck blast on 19 varieties was less than 5.0,and the severity of neck blast on Chuanxiang 8,Neixiangyou 1,Neixiangyou 3,Gangyou 94-14 and Qyou 5 was relatively low (disease scale3.0) indicating highly resistant to the existing pathogen populations.Based on these findings,the strategy for controlling rice blast in Luzhou area was proposed.
【Fund】: 泸州市科委项目资助
【CateGory Index】: S435.111.41
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