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Diallel Analysis of Maize Resistance to Sorghum Downy Mildew¹

A diallel cross, including reciprocals, of six maize (Zea mays L.) inbred lines was analyzed for reaction to sorghum downy mildew [Peronosclerospora sorghi (Weston and Uppal) C.G. Shaw]. The crosses between the resistant lines and the susceptible ‘48-S-28’ showed intermediate disease reaction, suggesting a polygenic system for resistance to sorghum downy mildew in maize. The combining ability analysis revealed that both additive and nonadditive gene effects were present. However, additivity was clearly more important in determining disease reaction. Significant maternal differences were found, indicating that maternal and/or cytoplasmic inheritance is involved in the reaction to P. sorghi. Recurrent selection would be appropriate for accumulating genes for resistance to sorghum downy mildew in maize.

Key Words: Disease resistance • Combining ability • Maternal inheritance • Zea mays L. • Peronosclerospora sorghi (Weston and Uppal) C.G. Shaw

² Associate professor. Instituto de Genética, Facultad de Agronomia, Univ. Central de Venezuela, Maracay, Venezuela.

Received for publication January 28, 1986.

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