@article{uhr_goodman_1995, title={TEMPERATE MAIZE INBREDS DERIVED FROM TROPICAL GERMPLASM .2. INBRED YIELD TRIALS}, volume={35}, ISSN={["0011-183X"]}, DOI={10.2135/cropsci1995.0011183X003500030025x}, abstractNote={Tropical maize (Zea mays L.) is a germplasm resource that may contribute genes for high yield and disease resistance to temperate breeding programs. Yet, this resource has not been utilized extensively, mainly because of the poor agronomic performance and photoperiod sensitivity that often accompany tropical germplasm. The objective of this study was to determine the agronomic performance of 95 inbred lines derived in North Carolina from 100% tropical germplasm. Ninety‐five lines were derived from seven tropical commercial hybrids and intercrosses among them, using two complete cycles of pedigree selection. Visual selection emphasized early flowering, silk‐tassel synchrony, low ear placement, standability, prolificacy, and ear quality. The inbreeding coefficient of plants within these lines was 0.96 to 0.98. Agronomic performance was evaluated in inbred yield trials during 1990 at three locations. Grain yields ranged from 0.68 to 3.76 Mg ha−1. The highest yielding check inbred, NC252 (an improved B73), yielded 3.65 Mg ha−1, slightly less than the best experimental inbred. Mean percent stalk lodging ranged from 0 to 16%, and root lodging was infrequent. Grain moisture at harvest was mostly within the range of the checks. The genetic correlation between grain yield and number of ears per plant was 0.72, while the correlation between grain yield and moisture was not significant. Several fines possessed excellent combining ability and inbred performance. The best line, 1497‐2, produced testcrosses competitive with the best commercial hybrids and as a line per se performed as well as the best public inbreds available for North Carolina.}, number={3}, journal={CROP SCIENCE}, author={UHR, DV and GOODMAN, MM}, year={1995}, pages={785–790} }
 @article{uhr_goodman_1995, title={Temperate maize inbreds derived from tropical germplasm: I. Testcross yield trials}, volume={35}, DOI={10.2135/cropsci1995.0011183X003500030024x}, abstractNote={Tropical maize (Zea mays L.) has been suggested as a germplasm source to improve yield and disease resistance for U.S. breeding programs. Our objective was to compare the performance of testcrosses between tropical‐derived lines and an elite U.S. tester with the performance of adapted commercial hybrids. A group of 190 lines was derived from seven tropical commercial hybrids and intercrosses among them using two cycles of pedigree selection for adaptation to North Carolina. Ear‐to‐row sib‐mating and selfing were used to develop the lines. Visual selection of each generation concentrated on silk‐tassel synchrony, earliness, standability, lower ear height, and ear quality. No selection for combining ability was made during line development. Lines were topcrossed onto the public U.S. single cross B73Ht/Mo17Ht. Testcrosses were evaluated in yield trials at three locations during 2 yr. Among 190 testcrosses, 16 were within the LSD (0.05) of the commercial checks for yield, standability, and grain moisture. Most genetic variation for yield, standability, and grain moisture was accounted for by differences among pedigrees rather than differences among lines within a pedigree. Seventeen testcrosses yielded more than the tester, B73Ht/ Mol7Ht. The inbreds B73 and Mo17 represent two dominant heterotic groups utilized by U.S. maize breeders. Since tropical‐derived lines appear to combine well with B73/Mo17, they could be used as a source of disease resistance for either heterotic group. In addition, they have potential to enhance the combining ability of inbreds representing these two heterotic groups.}, number={3}, journal={Crop Science}, author={Uhr, D. V. and Goodman, M. M.}, year={1995}, pages={779} }
 @article{uhr_murphy_1992, title={HERITABILITY OF OAT MOSAIC RESISTANCE}, volume={32}, ISSN={["0011-183X"]}, DOI={10.2135/cropsci1992.0011183X003200020009x}, abstractNote={Detailed knowledge about the heritability of oat mosaic (OM) resistance would help breeders to more effectively plan strategies for incorporating OM resistance into new cultivars. The objective of this study was to estimate the heritability of resistance to OM in winter oat (Avena sativa L.) using variance component analysis, parent‐offspring regression, parent‐offspring correlation, and realized heritability. One hundred random F2:3 lines and their F2:4 progeny from a double‐cross population (NC 82‐45/NC 82‐79/2/NC 84‐67/NC 84‐68) were evaluated in six replicates of hill plots for 2 yr at two North Carolina locations. Soil type at the Piedmont Research Station was a Hiwassee clay loam (clayey, kaolinitic, thermic, Rhodic Kanhapludult) and at the Central Crops Research Station was a Cecil sandy clay loam (clayey, kaolinitic, thermic, Typic Kanhapludult). Resistance was estimated visually with a leaf mosaic symptom scale during the spring vegetative growth stage (GS 31). Broad‐sense heritability estimates based on entry means were 0.75 for F2:3 lines and 0.84 for F2:4 lines. The parent‐offspring regression coefficient was 0.80 and parent‐offspring correlation was 0.73. Realized heritability was 0.99, based on entry means from four environments. Heritabilities in a second population (Brooks/NC 81‐341/2/NC 83‐123/Madison) evaluated at one location over 2 yr were smaller. The results suggested that considerable progress may be expected from visual selection for OM resistance in segregating populations.}, number={2}, journal={CROP SCIENCE}, author={UHR, DV and MURPHY, JP}, year={1992}, pages={328–331} }