A field study was conducted using eight parents and 28 F1 cross combinations of quality protein maize during rabi 2012-13 with objective to identify the best parental genotypes and cross combinations. None of the tested parents were found good for general combiner with respect to yield attributing traits and yield. Inbred lines I -07-6-4-4(P2), I-07-65-18-3 (P5) and I-07-65-13-1(P6) were found good general combiners for direct yield attributing traits whereas inbreds I-07-13-1-3(P1), I-07-65-13-1(P6) and I-07-59-5 (P7) contributed maximum genes for protein and its related traits. Among the hybrids, P7 x P8, P2 x P3 and P6 x P8 exhibited positive and significant specific combining ability effects for ear weight. High standard heterosis values were observed for lysine content whereas low values of heterosis were observed for tryptophan in protein over standard check hqpm1.

https://jsure.org.in/journal/index.php/jas/article/download/39/45

Combining Ability and Heterosis for Yield and Quality Traits in Quality Protein Maize

http://scholar.ufs.ac.za:8080/xmlui/bitstream/handle/11660/1487/MasindeniDR_PhD.pdf;sequence=1

Evaluation of South African high quality protein maize (Zea mays L.) inbred lines under optimum and low nitrogen conditions and the identification of suitable donor parents

Résumé Research Application Summary The biggest population in Zimbabwe depend on maize as a source of carbohydrates, yet it is deficient in protein and therefore makes the population prone to protein malnutrition. Quality Protein Maize (QPM) has double the amount of lysine and tryptophanand therefore desirable suitable to combat possible protein malnutrition. The Zimbabwe maize research programme is currently using QPM inbred lines whose combining ability for grain quality and agronomic traits has not been previously tested and validated. In this study, combining ability analysis was conducted to identify appropriate QPM donor inbred lines for use in the development of new QPM inbred lines and the conversion of non-QPM open pollinated varieties (OPVs) and inbred lines to QPM. From the study, the inbred lines CZL082 and CML511 are recommended for use as donors in the development of new QPM inbred lines and the conversion of non-QPM inbred lines and OPVs to QPM by the national maize research programme in Zimbabwe.

/pdf/combining-ability-analysis-of-quality-protein-maize-qpm-and-47bmdoxh3x.pdf

Combining ability analysis of quality protein maize (QPM) and non-PM inbred lines for kernel quality and some agronomic characteristics.

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Combining ability analysis of quality protein maize (QPM) and non-PM inbred lines for kernel quality and some agronomic characteristics.