Genetic Analysis for Yield and Its Components and Some Morpho-physiological Traits in Single and Reciprocal Crosses of Maize (Zea mays L.)

A. A. Wannows, S. A. Al-Ahmad, S. M. Shehab, G. A. Al-Lahham, E. W. Owil, R. E. Al-Mansour

Abstract


Complete diallel mating design experiment with reciprocal crosses was used to determine combining abilitiy and maternal effects of six maize inbred lines and their hybrid combinations with R.C.B.D. in three replications for grain yield, silking date, plant and ear height, shelling percentage, physiological maturity, ear length, ear diameter, during 2009-2010 season, at the Researches Center of Hama (G.C.S.A.R.). Crosses, general (GCA) and specific (SCA) combining ability mean squares were significant for all traits, while reciprocal crosses mean squares were non-significant for all traits except silking date and physiological maturity. Also, the maternal mean squares were non-significant for all traits except physiological maturity. The ratios σ2GCA/σ2SCA were detected for all traits and showed that non-additive gene action was more important than additive gene action in controlling of most traits except ear height and ear length. GCA effects showed that the lines P5 (IL.359-06) and P2 (IL.358-06) were good general combiners for grain yield. Also, SCA effects showed that five hybrids were the best F1 crosses combinations such as (IL.259-06 × IL.358-06) for grain yield. The results of means compared showed that the cross (IL.358-06 × IL.359-06) (13.478 Ton/h) and it's reciprocal cross (IL.359-06 × IL.358-06) (13.223 Ton/h) were the best hybrids compared with the two check varieties (Basel-1 and Ghota-82).

Keywords


Maize, Diallel cross, Combining ability

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