Abstract
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.
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