Link to home

Analysis of Host Species Specificity of Magnaporthe grisea Toward Foxtail Millet Using a Genetic Cross Between Isolates from Wheat and Foxtail Millet

January 2003 , Volume 93 , Number  1
Pages  42 - 45

J. Murakami , R. Tomita , T. Kataoka , H. Nakayashiki , Y. Tosa , and S. Mayama

Faculty of Agriculture, Kobe University, Nada, Kobe 657-8501, Japan

Go to article:
Accepted for publication 8 August 2002.

Host species specificity of Magnaporthe grisea toward foxtail millet was analyzed using F1 cultures derived from a cross between a Triticum isolate (pathogenic on wheat) and a Setaria isolate (pathogenic on foxtail millet). On foxtail millet cvs. Beni-awa and Oke-awa, avirulent and virulent cultures segregated in a 1:1 ratio, suggesting that a single locus is involved in the specificity. This locus was designated as Pfm1. On cv. Ki-awa, two loci were involved and one of them was Pfm1. The other locus was designated as Pfm2. Interestingly, Pfm1 was not involved in the pathogenic specificity on cv. Kariwano-zairai. These results suggest that there is no “master gene” that determines the pathogenic specificity on all foxtail millet cultivars and that the species specificity of M. grisea toward foxtail millet is governed by cultivar-dependent genetic mechanisms that are similar to gene-for-gene interactions controlling race-cultivar specificity.

Additional keywords: Pyricularia, resistance.

© 2003 The American Phytopathological Society