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Hallauer, A.R.

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Hallauer
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A.R.
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Hallauer, A.R.

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    An evaluation of kernel zinc in hybrids of elite Quality Protein Maize (QPM) and Non-QPM inbred lines adapted to the tropics based on a mating design
    (MDPI, 2020) Mageto, E.; Lee, M.; Dhliwayo, T.; Palacios-Rojas, N.; San Vicente Garcia, F.M.; Burgueño, J.; Hallauer, A.R.
    Publication
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    Incorporation of elite subtropical and tropical maize germplasm into elite temperate germplasm
    (Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca per la Maiscoltura, 2006) Whitehead, F.C.; Caton, H.G.; Hallauer, A.R.; Vasal, S.K.; Cordova, H.S.
    Elite germplasm and adequate genetic variation are essential in successful plant breeding programs.Maize (Zea mays L.) breeding programs in the U.S. Corn Belt have realized significant genetic advance with a limited sample of the available maize germplasm. The objective of our study was the incorporation of elite subtropical and tropical germplasm into elite U.S. Corn Belt germplasm. Crosses, backcrosses, and testcrosses were evaluated to identify superior progenies that were intermated to form germplasm sources that include 75% temperate germplasm and either 25% subtropical or 25% tropical germplasm. Backcrosses (25%) and testcrosses (12.5%) with 25% exotic germplasm had maturities and agronomic traits similar to the elite temperate germplasm sources. The populations formed by intermating the superior backcross progenies, based on backcross and testcross data, will provide additional germplasm resources for future use in temperate maize breeding programs.
    Publication
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    Relative performance of testers to identify elite lines of corn (Zea mays L.)
    (Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca per la Maiscoltura, 1998) Sahagun, J.; Hallauer, A.R.; Cordova, H.S.
    Testcross evaluation is used to determine the relative potential of corn (Zea mays L.) lines in a hybrid breeding program. Choice of tester is important for efficient selection among lines for their potential in hybrids. Testcrosses among 21 lines and seven testers were evaluated at seven environments in Guatemala. The experimental design was a randomized complete block with a split-plot arrangement, where lines were assigned to whole plots and testers to subplots. The objectives of the study were to obtain information for choice of testers and to identify the more convenient tester to use in early testing for a hybrid program in which three-way and double-cross hybrids are commonly used. Data for yield and agronomic traits were recorded, but the combined analysis for yield (t/ha) was the main trait of interest. Differences among lines and among testers across environments were highly significant (P ≤ 0.01). Highly significant differences for the testers x lines interaction indicated that the testers ranked the lines differently. Coefficient of concordance (W) and Pearson correlations (r) suggested that the ranking of lines across testers was relatively consistent. Testcrosses with a single cross had the greatest average yield (6.48 t/ha). Based on the variance among testcrosses, estimates of general combining ability, correlation with the other testers, and acceptable performance itself, the single cross tester was suggested as the tester for the hybrid breeding program in Guatemala. Lines with good general combining ability for different hybrid combinations were identified. Three-way testcrosses superior to the best check (ICTA HB-85) were identified for further evaluation as potential new hybrids for release. Significant correlations between yield and diseases (Southern corn rust caused by Puccinia polysora Underw. and Northern corn leaf blight caused by Exserohilum turcicum Pass. = Helminthosporium turcicum Pass.) reflected the importance of emphasizing selection for disease resistance during line development.
    Publication