Estimation of Heterosis and Combining Ability for Some White Maize Inbred Lines Using Half-Diallel Crossing | ||||
| Journal of Plant Production | ||||
| Article 3, Volume 12, Issue 11, November 2021, Page 1151-1156 PDF (927.72 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2021.204904 | ||||
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| Author | ||||
| I. N. Abd El-Zaher | ||||
| Agron. Dept., Fac. of Agric., Al-Azhar Univ., Assiut Branch | ||||
| Abstract | ||||
| Eight S7 white maize inbred lines were derived from selfing of S5 inbred lines of two populations, i.e., Giza-2 and IW-469 were chosen to be used as parents of a half-diallel crossing and obtained on 28 F1 crosses, which evaluated along with the 2 check hybrids at Experimental Farm, Faculty of Agriculture, Al-Azhar University, Assiut Branch in 2021 to identify the best parental general combiners and specific combinations to improve maize for earliness and yield. Results manifested that highly significant differences were detected among crosses for all the studied traits. Also, means squares due to GCA and SCA were highly significant for all traits. The ratio of σ2GCA/σ2SCA was less than one for all traits. The 4 crosses; P1 x P4, P3 x P6, P5 x P6 and P7 x P8 possessed desirable significant positive heterotic effects for increasing grain yield/plant relative to the checks SC-136 and SC-10, and among them the cross P3 x P6, also possessed significant negative desirable standard heterotic effects for tasseling and silking earliness relative to both the check hybrids. The parent P8 possessed significant desirable GCA effects for grain yield and its components with silking earliness. The 14 crosses; P1 × P2, P1 × P4, P1 × P5, P1 × P8, P2 × P3, P2 × P8, P3 × P4, P3 × P6, P3 × P7, P3 × P8, P4 × P5, P5 × P6, P5 × P7 and P7 × P8 possessed significant positive desirable SCA effects for high yielding ability and among them the 2 crosses; P1 × P8 and P2 × P3, also possessed significant desirable SCA effects for tasseling and silking earliness. | ||||
| Keywords | ||||
| Maize; combining ability; gene action; heterosis; yield and earliness | ||||
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