COMBINING ABILITY AND HETEROTIC GROUPING OF TWO SETS OF NEW MAIZE INBRED LINES | ||||
| Egyptian Journal of Plant Breeding | ||||
| Volume 23, Issue 4, March and April 2019, Page 667-679 PDF (578.71 K) | ||||
| Document Type: Original research | ||||
| DOI: 10.12816/ejpb.2019.344262 | ||||
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| Abstract | ||||
| Two sets of white and yellow maize crosses were developed by crossing 17 new inbred lines with two testers for each set using line × tester method at Sakha Agricultural Research Station in 2015 growing season. The resulting 34 F1 crosses plus four standard checks for each set were evaluated in 2016 summer season at two locations (Sakha and Mallawi) for set-1 and at (Sakha and Sids) for set-2. Days to 50% silking (SD) and grain yield t ha-1 (GY) were recorded. Significant mean squares due to line (L) and L × Loc were found for the two traits in the two sets. Also, mean squares due to tester (T) were significant for SD in set-1 and GY in set-2. Meanwhile, mean squares due to L × T and L × T × Loc interaction were significant for all traits in the two sets, except for L × T × Loc for SD and GY in set-1. Four white inbred lines (L2, L3, L15 and L17) in set-1 and five yellow inbred lines (L18, L22, L25, L26, and L27) in set-2 exhibited positive and significant GCA effects for yield trait. The single cross L12 × Sk5 in set-1 and L32×Sk4 in set-2 manifested desirable SCA effects for SD and GY toward early maturity and high yielding ability. Days to 50% silking trait in the two sets was controlled mainly by non-additive gene action. Meanwhile, GY trait was controlled by non-additive in set-1 and additive gene action in set-2. The inbred lines in each set for grain yield based on heterotic group specific and general combining ability (HSGCA) method were classified into two heterotic groups as follows: set-1 group-1(Sk5) included L4, L5, L6, L8, L13 and L16. While, group2 (SC131) included L1, L7, L9, L10, L12 and L14. In set-2, group1 (Sk4) included L19, L20, L28 and L29. Meanwhile, in set-2, group-2 (SC177) included L24, L30, L31, L32, L33 and L34. These groups could be used in breeding programs for selecting the best parents in making crosses. | ||||
| Keywords | ||||
| Maize; Line×tester; Additive; Non-Additive; Gene action; Heterotic group | ||||
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