Line × Tester Analysis Using Three-way Crosses of Yellow Maize in a Multi-location Trial | ||||
| Assiut Journal of Agricultural Sciences | ||||
| Volume 56, Issue 1, January 2025, Page 21-32 PDF (545.74 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajas.2024.321291.1407 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Rizk S.H. Aly  ; Mohamed E.M. Abd El-Azeem; Ashraf K. Mostafa
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| Maize Department, Field Crops Research Institute, Agricultural Research Center, Giza, Egypt. | ||||
| Abstract | ||||
| Eleven new yellow maize inbred lines were top crossed with three testers, i.e., SC162, SC-173 and SC-177 during 2022 summer season. The 33 three-way crosses (TWC) and the two check hybrids TWC-360 and TWC-368 were evaluated at three locations; Sids, Mallawy, and Gemmeiza Agric. Res. Stations, Egypt, during 2023 summer season. The objectives of this research were to estimate the combining abilities of eleven new yellow maize inbred line and their crosses, to identify the superior three-way crosses in yielding ability, and to estimate the correlation coefficient between the studied traits. Results revealed that locations (Loc) were significant for all studied traits except ear position% (Ep %) trait. Mean squares of lines (L), testers (T), L × T and their interactions with locations; L × Loc, T × Loc and L × T × Loc were significant (p<05-p.01) for most traits. Results showed that only four crosses did not outyielded the highest check TWC-368. Two inbred lines; L10 and L11 were desirable for general combining ability (GCA) effects of days to 50% silking emergency (DS), plant height (PH) and ear height (EH) traits. Also, two inbred lines L2 and L5 had positive and significant general combining ability (GCA effects for grain yield (GY) toward high yielding. T1 and T3, the best testers have general combining ability (GCA) effects toward high yielding. While, T2 has the best general combiner for earliness, short plant and ear heights. Six crosses: L3 × T2, L4 × T3, L5 × T2, L6 × T3, L7 × T1 and L8 × T1 had positive and significant Specific combining ability (SCA) effects for grain yield ardab/ feddan (ard. fed.-1); (1 ard. = 140kg and 1 fed = 4200m2). Based on these results, these promising three-way crosses should be evaluated in advanced trials to confirm their potential in breeding programs aimed at developing superior crosses with improved traits. | ||||
| Keywords | ||||
| Correlation; GCA; Line × tester; SCA; Zea mays | ||||
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