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Studies on disease resistance in rice breeding v. analysis of blast resistant genes of rice variety zhong dan no. 2


Studies on disease resistance in rice breeding v. analysis of blast resistant genes of rice variety zhong dan no. 2



Acta Agronomica Sinica 15(3): 267-272



The inheritance of resistance of a Chinese rice variety Zhong-Dan No. 2 to seven blast fungus strains was studies. Eight monogene-carrying rice varieties Shin 2 (Pi-ks), Ishikari Shiroke (Pi- i), K1 (Pi-ta), K59, (Pi-t), Aichi Asahi (Pi-a), Kanto 51 (Pi-k), Toride 1 (Pi-zt), and BL7 (Pi-b) were used as a set of differential varieties, among which Shin 2 was used as the "susceptible-variety" because it is susceptible to all the seven blast strains used. The four-leaf-stage seedlings of the parental varieties and their F1, F2 and B1F1 generations were inoculated by the spraying method separately with each of the seven fungus strains P-2b, Ken 53-33, Ina 72, Hoku 1, Ken 54-04, Ken 54-20 and Ina 168 in greenhouse. The responsive patterns indicated that Zhong-Dan No. 2 carries two dominant genes Pi-a and Pi-i, and that it does not possess Pi-zt, Pi-Ta, Pi-t and Pi-b genes.

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