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

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.

Key Words: Disease resistance • Zea mays L.

² Senior researcher, Tropical Agric. Res. Center, Yatabe, Tsnkuba, Ibaraki 305, Japan, and former assistant professor, Dep. of Agronomy, Univ. of the Philippines, College, Laguna, the Philippines (now research manager for Hybrid Seed Program, San Miguel Corporation, Calauan, Laguna, the Philippines).

Received for publication November 5, 1979.