Combining Ability and Gene Action Using 10 X 10 Diallel Crosses of Ten Maize Inbred Lines (Zea mays L.)

Abstract

Ten yellow maize inbred lines were derived from different sources were evaluated in this study to estimate combining ability, type of gene action and superiority % of the F1 , s over commercial check hybrids. In 2019 grown season, all possible combinations between these lines were done in a half diallel (Griffing's 1956, method 4, model 1) to give 45 crosses at Sids Agricultural Research Station. In 2020 season, 45 crosses along two commercial hybrids; SC. 168 and SC. 3444 were evaluated in replicated trails conducted at three locations; Sakha, Sids and Nubaria Agricultural Research Stations. Data were recorded for days to 50% silking, plant height, ear height, ear position%, late wilt resistant % and grain yield. The results showed significant differences between the three locations for all the studied traits except LWR % and GY traits, indicating that the three locations differed in the environmental conditions. Mean squares of genotypes and their interactions with locations were significant or highly significant for all the studied traits. The results showed that the general combining ability and specific combining ability variances were significant or highly significant for all the studied traits, indicating that both additive and non-additive gene action were important in the inheritance of these traits. The parental lines Sd. 3180 and Sd. 21 had a good GCA effects for all the studied traits. The crosses Sk. 1 x Sd. 15 and Gm. 6052 x Gz. 658 showed desirable values of SCA effects and superiority% over check for yield.

Estimation of Genetic Parameters, Combining Ability and Heterotic Groups of New Yellow Maize Inbred Lines Using Line X Tester Model Across Two Locations

“…The correlation coefficient between LWR% showed a positive and highly significant association with GYP -1 (0.414*) and GY (0.425*). These results align with the findings of Abd El-Azeem et al (2021) and Aly et al, (2022).…”

Superiority and Combining Ability for Grain Yield and Agronomic Traits of Maize (Zea mays L.)

“…Results showed that there were highly significant differences among locations for all studied traits except for GY and DTS traits, indicating that the three locations differed in the environmental conditions. These results are similar to those obtained by Haddadi et al, (2012), Aly (2013), Abd EL-Azeem et al, (2021, Apraku et al, (2021) and Aly et al, (2022). Mean squares for crosses (C) and their interaction with locations (C × Loc) were significant and highly significant for all studied traits except for C × Loc of EHT.…”

“…Mean squares due to GCA × Loc and SCA × Loc interactions were significant for all studied traits except for GCA × Loc and SCA × Loc of EHT and for GCA × Loc of Epos%, indicating that additive and non-additive gene effects were affected by environmental conditions in most traits. GCA × Loc was larger than SCA × Loc for all studied traits except Epos% trait, indicating that additive gene effects are more influenced by environmental than non-additive components; Abd EL-Azeem et al, (2021) for DTS and GY, Aboyousef et al, (2022) and Aly et al, (2022) for DTS, PHT, EHT and GY traits. 1.25 0.50 *, ** significant at 0.05 and 0.01 levels of probability, respectively.…”

Combining abilities and genetic parameters for grain yield and some agronomic traits in maize (Zea mays L.)

“…The parental lines L 1 , L 4 , L 6 , L 7 , L 8 and L 11 had desirable values toward earliness. With respect to PHT and EHT, the inbred lines L 6 , L 7 , L 8 L 10 and L 11 were the best general combiners toward shorter plant and lower ear placement, implying the tendency of this line to reduce plant height, which is very important for development of genotypes resistant to loading [1] and [4]. The best general combiners for GY ard fed −1 were L 1 and L 3 .…”

“…Author details 1 Genetics Department, Faculty of Agriculture, Mansoura University, Elgomhouria St., Mansoura 35516, Egypt. 2 Maize Research Program, ARC, FCRI, Cairo, Egypt.…”