Estimation of combining ability effects of new white maize inbred lines (Zea mays L.) via line x tester analysis [electronic resource].

Includes references.

Five new white maize inbred lines derived from Giza-2 population in the 56 generation were topcrossed to four testers i.e. two inbred lines Sd7 and Sk9 and two single crosses SC10 and SC128 at Ismailia Agric. Res. Stn. in 2010 season. In the growing season 2011, twenty topcrosses and two check hybrids, SC128 and TWC324 were evaluated in two locations, Gemmeiza and Ismailia Agric. Res. Stns. Results showed that differences between the two locations were significant for all traits, except for ear diameter. Crosses and lines mean squares were significant for all traits. Testers mean squares were significant for all traits, except for no. of ears 100 plants-1, ear diameter and no. of rows ear-1. Line x tester interactions were significant or highly significant for all traits, except for ear diameter. Interactions of crosses and lines with locations were significant for all of the studied traits, except (crosses x location) for ear length and no.of rows ear-1, and ear length, ear diameter and no.of rows ear-1 for (line x location) interaction. Results indicated that the SCA variances played the major role in the inheritance of all traits, except for ear height and ear diameter. Non-additive type of gene action was affected more by environmental condition than additive type of gene action for all traits, except for no. of rows ear-1. Parental line 6164 had negative (desirable) and significant GCA effects for 50% silking, plant and ear heights toward earliness, shorter plant, and lower ear placement, respectively.

Summary in Arabic.

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