GENERAL AND SPECIFIC COMBINING ABILITY FOR WHITE MAIZE INBRED LINES FOR GRAIN YIELD AND ITS RELATED TRAITS

Document Type : Researches

Authors

1 Dept. Maize, Field Crops Inst., Agric. Res. Cent., Egypt.

2 Dept. Maize, Field Crops Institute, Agricultural Research Center, Egypt.

Abstract

Developing high-yielding and heterotic maize hybrids is essential for sustaining agricultural production, especially in the context of rapid climate change and a growing global population. By using line × tester design, fourteen white maize inbred lines derived from different sources were crossed by three inbred lines as testers; Sd43, Sk13 and Sk5 at Sakha Agricultural Research Station during 2022 growing season. The resulting 42 F1 single crosses in addition to one commercial check hybrids (SC.10) were evaluated at three locations; Sakha, Nubaria and Sids Agricultural Research Stations in 2023 growing season. Mean squares due to Locations, lines, testers and lines × testers interactions were significant or highly significant for most of the studied traits. The desirable general combining ability (GCA) effects were assigned for inbred lines; Sk5004/21, Sk5007/32 and tester Sk5 for earliness, short plant heights and ear heights, inbred line Sk5004/23 and tester Sk 3 for grain yield and ear length, and SK 5007/33 for grain yield and ear diameter. The best hybrids for SCA effects were Sk 5004/22 × SK13 for earliness, SK5005/30 × Sd 43 for short plant height, SK 5004/20 x Sd43 for grain yield SK 5005/29 × SK 13 for ear length and SK 5004/26 × Sk 5 for ear diameter. Six hybrids (Sk5004/20 × Sd43), (Sk5005/26 × Sk13), (Sk5005/27 × Sk13), (Sk5005/31 × Sd43), (Sk5007/33 × Sd43) and (Sk5007/33 × Sk13) were significantly out-yielded the check SC10. These promising single hybrids are valuable and could be used in maize breeding programs for high yield.

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Sinai Journal of Applied Sciences
Volume 13, Issue 4
July and August 2024
Pages 455-464

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