Document Type : Original research
10.12816/ejpb.2022.291742
Abstract
The identification of the best combiner lines in the breeding programe is important. Thus, new nineteen white maize inbred lines were crossed as female parents with two inbred lines as testers, i.e. SK-9 and Sk-13 at Sakha Agricultural Research Station, Field Crops Research Institute, Agricultural Research center during 2020 growing summer season. The 38 crosses with the commercial check hybrid SC 10 were evaluated at three locations, i.e. Sakha, Sids and Mallawy Research Stations during 2021 growing season. A randomized complete block design with three replications was used. The data were collected on number of days to 50 % silk emergence (DTS), plant height (PH) and grain yield per feddan (GYPF). The results showed that, locations (Loc), crosses (C), lines (L), Testers (T), lines x testers (L x T), (C x Loc), (L x Loc), (T x Loc) and (L x T x Loc) mean squares were significant for all traits, except (T) for DTS and (L x T x Loc) for DTS and PH traits. The parental inbred lines (L-1, L-4, L-6, L-7 and L-14) possessed high GCA effects for grain yield and (L-3, L-12 and L-13) showed desirable GCA effects for both earliness and short plant. The cross L-1 x SK-9 possessed desirable SCA effects and they also out-yielded, significantly, the check hybrid SC 10. Thus, this cross could be utilized for hybrids breeding program. The parental inbred lines were grouped into two groups based on heterotic group specific and general combing ability (HSGCA) method for (GYPF) trait. The group one was for tester SK-9 included (L-4, L-10, L-11, L-13, L-16, L-17 and L-19) while the group two was for tester SK-13 included (L-2, L-3, L-8, L-9, L-12, L-15 and L-18). These groups could be used in a breeding program for selecting the best parents to make crosses in other combinations.
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