Previous View
 
APSnet Home
 
Phytopathology Home


VIEW ARTICLE

Inheritance of Virulence in Helminthosporium turcicum to Monogenic Resistant Corn. S. M. Lim, Department of Plant Pathology, Illinois Agricultural Experiment Station, Urbana 61801; J. G. Kinsey(2), and A. L. Hooker(3). (2)(3)Department of Plant Pathology, Illinois Agricultural Experiment Station, Urbana 61801. Phytopathology 64:1150-1151. DOI: 10.1094/Phyto-64-1150.

The progeny from a cross between isolates of Helminthosporium turcicum avirulent or virulent to monogenic (Ht1) resistant corn segregated in a 1:1 ratio indicating that virulence in the pathogen is monogenic in inheritance. Corn gene Ht2 conditioned resistance to both parental isolates. We propose that H. turcicum biotypes avirulent to corn carrying genes Ht1 and Ht2 be designated by the virulence formula Ht1Ht2/0 (formula number US1) and biotypes avirulent to corn carrying gene Ht2 but virulent to corn carrying gene Ht1 be designated by the virulence formula Ht2/Ht1 (formula number US2). The Zea mays-H. turcicum host-pathogen system fits the gene-for-gene model.

Additional keywords: Trichometasphaeria turcica, Zea mays L., chlorotic-lesion resistance, gene Ht1, gene Ht2, virulence formula, gene-for-gene model.