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Acta Agron Sin ›› 2010, Vol. 36 ›› Issue (10): 1791-1795.doi: 10.3724/SP.J.1006.2010.01791

• RESEARCH ACTIVITIES • Previous Articles     Next Articles

Preliminary Analysis on Rice Blast Disease and Genetic Diversity of Its Pathogen in Multi-Genotype and Mono-Genotype Varieties

TANG Zhi-Ming12,JIN  Xiao-Chun2**,LI  Xiao-Fang14*,LIU Yan-Zhuo1,LIU  Zhi-Xia1,LU  Dong-Bai1,MAO  Xin-Hua1,GAO  Yun1,LU De-Cheng1   

  1. 1 Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; 2 Hunan Agricultural University, Changsha 410128, China; 3 Qianjiang Institute of Agricultural Sciences, Qianjiang 433100, China; 4Yangtze University, Jingzhou 434025, China;
  • Received:2010-06-02 Revised:2010-06-16 Online:2010-10-12 Published:2010-08-04
  • Contact: LI Xiao-Fang,E-mail:lixiaofang@163.net

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Abstract: The haplotypes of rice blast disease (Magneaporthe grisea) were obtained and analyzed in the multi-genotype and mono-genotype variety groups by DNA fingerprinting with rep-PCR. The isolates of Magneaporthe grisea were classified into several haplotypes. It was found that the diversity index of blast pathogen ranged from 0.521 to 0.603 in multi-genotype varieties, and from 0.319 to 0.705 in mono-genotype varieties. The diversity index of blast pathogen was lower in susceptible varieties and higher in resistant ones. However, there was no difference in the diversity of rice blast fungi between the two variety groups. The disease rate of panicle-neck blast in multi-genotype varieties was remarkably lower than the weighed average value of disease rates in percentage of their components in mono-genotype varieties. The diversity of isolates in both multi-genotype varieties and mono-genotype varieties was not different, but the resistant component of the multi-genotype varieties blocked spore dispersal of the causal fungus and reduced the disease. So using the multi-genotype varieties is a good approach to control the rice blast.

Key words: Blast, Rice, Haplotype, Multi-genotype

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