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Estimation of combining ability and heterosis for some maize inbred lines and its single crosses [electronic resource].

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Attia, A. N

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Language: English Summary language: Arabic Description: P.83-98Other title:

تقدير القدرة على الائتلاف وفوة الهجين لبعض سلالات الذرة الشامية وهجنها الفردية [Added title page title]

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Mansoura University journal of plant production, 2015 v. 6 (1) [electronic resource].

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In: Mansoura University Journal of Plant Production 2015.v.6(1)Summary: Two field experiments were conducted out during 2012 and 2013 seasons to estimate combining ability, heterosis for six inbred lines (Three American inbreds: P97, 873and Oh.43 and three Egyptian inbred lines: R39, lnb.1021 and lnb. 1004) and its F1 crosses. The most important results obiained from this investigation can be summarized as follows: • The differences among means of parental inbreds and also among means of crosses were significant or highly significant for all studied traits. • •Mean squares of crosses were highly significant for all studied traits, indicating wide range of genetic variability among the studied crosses and this is primary requirement for further computation. • Both general and specific combining abilities mean squares were found to be highly significant for all studied traits. • GCA/SCA variances ratios were found to be lower than unity for six traits i.e. time to tassel emergency, time to silk emergency, number of rows/ear, number of kernels/row, grain yield/plant and shelling percentage and higher than unity for plant height and 100-Kernel weigh. • Significant positive general combining ability (GCA) effects were found for most studied traits. The best combiners were P2 (P79) and P4 (lnb.1021) for earliness traits; P5 (lnb.1004) and P6 (Oh.43) for plant height; P5 (lnb.1004) for number of rows/ear; P1 (R39) for number of grains/row; P2 (P97), P3 (873) and P4 (lnb.1021) for 100-grain weight; P1 (R39) for grain yield/plant; P1 (R39) and P2 (P97) for shelling percentage. Keywords: Maize, Inbred lines, Crosses, Combining ability, Heterosis.

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Two field experiments were conducted out during 2012 and 2013 seasons to estimate combining ability, heterosis for six inbred lines (Three American inbreds: P97, 873and Oh.43 and three Egyptian inbred lines: R39, lnb.1021 and lnb. 1004) and its F1 crosses. The most important results obiained from this investigation can be summarized as follows: • The differences among means of parental inbreds and also among means of crosses were significant or highly significant for all studied traits. • •Mean squares of crosses were highly significant for all studied traits, indicating wide range of genetic variability among the studied crosses and this is primary requirement for further computation. • Both general and specific combining abilities mean squares were found to be highly significant for all studied traits. • GCA/SCA variances ratios were found to be lower than unity for six traits i.e. time to tassel emergency, time to silk emergency, number of rows/ear, number of kernels/row, grain yield/plant and shelling percentage and higher than unity for plant height and 100-Kernel weigh. • Significant positive general combining ability (GCA) effects were found for most studied traits. The best combiners were P2 (P79) and P4 (lnb.1021) for earliness traits; P5 (lnb.1004) and P6 (Oh.43) for plant height; P5 (lnb.1004) for number of rows/ear; P1 (R39) for number of grains/row; P2 (P97), P3 (873) and P4 (lnb.1021) for 100-grain weight; P1 (R39) for grain yield/plant; P1 (R39) and P2 (P97) for shelling percentage. Keywords: Maize, Inbred lines, Crosses, Combining ability, Heterosis.

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