Genetic analysis for grain yield and some agronomic traits in some new white maize inbred lines by using line X tester analysis

Abstract EN

Nineteen new white maize inbred lines were top crossed with two testers i.

e.

; Sd.

7 and Sd.

63 at Gemmeiza Research Station in 2017 growing season.

The resulted 38 crosses in addition to three commercial check hybrids i.

e.

SC10, SC128 and SC 2031 were evaluated at Gemmeiza and Sids Agriculture Research Station Farms during 2018 growing season.

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

Analysis of variance of crosses and their components, lines, testers and lines x testers showed highly significant differences for all traits, except lines x testers for days to 50% silking.

σ²GCA was larger than σ²SCA for all traits.

These results indicated the dominance of additive gene action in the inheritance of these traits.

The inbred lines L4, L7, L10 and L19 (for earliness) and the inbred lines L1, L5, L10, L11and L12 (for grain yield) had high general combining ability.

The crosses L10 x T1 (42.91 ard.

/fed.

), L11 x T1 (38.40 ard.

/fed.

) and L14 x T1(35.65 ard /fed) had high mean values and highly significant SCA effects for grain yield.