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Diallel Analysis of Maize Resistance to Sorghum Downy Mildew 1
Author(s) -
Borges Orángel L. F.
Publication year - 1987
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1987.0011183x002700020006x
Subject(s) - downy mildew , diallel cross , biology , sorghum , agronomy , inbred strain , marker assisted selection , plant disease resistance , gene , genetics , quantitative trait locus , hybrid
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.