Scientia Agricultura Sinica ›› 2005, Vol. 38 ›› Issue (12): 2428-2433 .

• PLANT PROTECTION • Previous Articles     Next Articles

Virulence Variation in Sexual Progeny and Composition of Avirulence Genes from the Cross CH63 and TH16 of Magnaporthe Grisea

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  1. 中国水稻研究所
  • Received:2004-07-21 Revised:1900-01-01 Online:2005-12-10 Published:2005-12-10

Abstract: A cross was made between two isolates of Magnaporthe grisea, CH63 and TH16. A total of 78 ascospore isolates were tested for pathogenicity on 36 rice varieties. The 71 pathotypes were clearly observed in the sexual progeny. The segregation ratio of avirulence and virulence was 1∶1, 1∶3, 3∶1, 1∶7, 15∶1 and 1∶15 on different rice varieties, respectively. The segregation ratio indicated that the avirulence and virulence to different varieties were controlled by a single or more than one avirulence genes. Genetic analysis showed that parental isolates caused various avirulence and virulence phenotypes on different variety. In the cross, avirulence and virulence on K59(Pi-t), Zhong 98-18,Tetep, T641, C102TTP(Pi-4), C101TTP6, E No.11, Nonghu No.6, C101PKT(Pi-4a) and C105TTP-1(Pi-4) were controlled by a single gene, by 2 genes on 1461 Xuan, Zhong156, Zhong 98-19, 6392 Xuan, Magutaiyin No.1, Lement, Miyazaki 7,Vandana, Chokoto, Qingzhen 8, and Zhenyou 3.

Key words: Magnaporthe grisea, Progeny isolate, Pathogenicitic segregation, Avirulence gene

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