Combining ability and type of gen action of some new yellow maize inbred lines

الملخص EN

Fifteen yellow maize inbred lines derived from different hetrotic group were used in this study.

In 2016 growing season the fifteen inbred lines were top-crossed to each of two testers In 2017 season, 30 top-crosses along with four commercial check hybrids were evaluated in replicated yield trails conducted at Sakha and Mallawy.

Data were recorded for days to 50% silking, plant and ear height and grain yield.

Combined analysis over the two locations showed that mean squares due to crosses, lines, testers and line x tester were significant for all the studied traits.

Mean squares due to lines x testers were significant for all the studied traits, indicating that differed in their order of performance in crosses with each of the testers.

Mean squares due to crosses x location, lines x location and tester x location interaction were significant for all the studied traits, except no of days to 50% silking of line x tester.

Mean squares due to lines x testers x locations interaction were significant for all traits, except plant height.

The magnitude of σ2 GCA was larger than that obtained for σ2 SCA for all the studied traits.

For grain yield, six single crosses i.e.

L-1 x Mall.5035, L-2 x Mall.5035, L-4 x Mall.5035, L-8 x Mall.5035, L-10 x Mall.5035 and L-11 x Mall.5035 significantly outyielded the check hybrid SC-168.

Only one cross L-3 x SC-162 significantly out-yielded the check hybrid TWC-360.The best GCA effects were obtained from five inbred lines i.e.

L-1, L-2, L-4, L-8 and L-11 for grain yield exhibited positive and significant GCA effects.

The top-crosses (L-1, L-8 and L-10 x Mall.5035 and L-3, L-5 and L-13 X SC-162) had positive and significant SCA effects