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This article in CS

  1. Vol. 20 No. 5, p. 590-594
     
    Received: Nov 5, 1979
    Published: Sept, 1980


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doi:10.2135/cropsci1980.0011183X002000050011x

Inheritance of Resistance to Philippine Downy Mildew of Maize, Peronosclerospora philippinensis1

  1. K. Kaneko and
  2. B. A. Aday2

Abstract

Abstract

Various hypotheses on the mode of inheritance of resistance to downy mildew of maize (Zea mays L.) have been proposed on the basis of several studies, and it was suggested that the mode varied with the different epiphytotic conditions. Mode of inheritance of resistance to Philippine downy mildew (Peronosclerospora philippinensis), was investigated under experimental conditions, at different plant ages. The results show that the mode of inheritance of resistance to downy mildew changes from complete to partial dominance as the infection changes from very slight to severe, and at about 50% level of infection it becomes additive. Thereafter there is a shift to susceptibility showing partial to complete dominance. Such findings suggest that downy mildew resistance is governed by a polygenic system with a threshold nature.

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