Estimation of The Combining Ability for Some New White Maize Inbred Lines under Different Environmental Conditions

THE MAIN objectives of the present study was to estimate the combining ability for some new white maize inbred lines under different environmental conditions and evaluation the 21 F₁ crosses come from this study under two plant densities (D₁ and D₂) at two locations (L₁ and L₂). Obtained results could be summarized as follows:

The non-additive genetic effects was more important than additive genetic effects in the inheritance of this traits; grain yield at L₁D₁, L₁D₂, L₂D₂ and combined data, days to 50% silking at all environments and combined data, ear height at L₁D₂ and 100-kernel weight at L₁D_1.
The additive gene effects were most responsible for controlling the inheritance of this traits; for grain yield at L₂D₁, plant height under all environments and combined data, ear height at L₁D₁, L₂D₁, L₂D₂ and combined data and 100-kernel weight at L₁D₂, L₂D₁, L₂D₂ and combined data.
The inbred lines; P₁ at L₂D₁, P₄ at L₁D₂ and P₇ at L₁D₂ had positive and significant GCA effects for grain yield.
The single crosses; (P₁xP ₄), (P₂ x P₆), (P₂ x P₇), (P₄ x P₇) and (P₅ x P₇) were the best crosses for superiority relative to SC10 for grain yield.