Diallel analysis for yield, downy mildew and agronomic characters in maize (Zea mays L.)‎

الملخص EN

Half diallel cross among 9 diverse inbred lines of yellow maize were done in 2012 growing season.

Thirty six F1’s and standard yellow check SC168 were evaluated in two trails, the first (grain yield) was planted at Sakha and Mallawy and the second (disease trail) was planted under artificial infection by downy mildew disease under two nitrogen rates at Sakha Station in 2013 growing season.

The mean squares due to locations (Loc.) were significant for most studied traits.

The mean squares due to crosses (Cr) were significant for all studied traits Crosses x location (Cr x Loc.) interactions were significantly for days to 50% silking, ear height, ear length, rows/ear and grain yield.

Both additive and non-additive effects were operating in the inheritance of most studied traits.

However, the additive gene effects were the more important in inheritance of all studied traits.

The best inbreds for GCA effects; were Sk6021 and GZ658 for most studied traits.

The best cross showed desirable SCA for most traits was Sk5005 x GZ658.

single cross Sk5001 x Sk11 (35.675 ard/fed.) was significantly outyielded, than check SC168 (31.589 ard/fed.) and showed resistance to downy mildew.