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Breeding for lodging resistance in maize populations derived from the variety Hays Golden
Abstract
This research had as objectives: (a) introduction of the elite line Mo44 into the maize population Hays Golden, and its derivatives HG(P$\sb{20}),$ HG(I$\sb{25}),$ and HG(C$\sb{25}),$ (b) improve grain yield (YIELD) and lodging resistance of (HG x Mo44)TCsyns, using a combination of selection between full-sib, within S, families, and testing in stress environments, and (c) synthesis of an improved population of HG x Mo44. Four sets of 97 S$\sb3$ lines from each population, each line crossed to Mo44, and three checks (N501D, N152 x Mo44, and B73 x Mo17) were evaluated in 1987 and 1988. Twenty-five selected testcrosses from each population were recombined to synthesize four synthetics, thereafter refered to collectively as (HG x Mo44)TCsyns, and individually as SynOM, SynIM, SynPM, and SynCM. In 1990, 196 full-sib families from each synthetic were evaluated in two locations at Nebraska, and planted in the nursery for selfing and selection within full-sib families. In 1991, S$\sb1$ families were evaluated in two stress environments. Using data on full-sib and S$\sb1$ families, three methodologies of selection were compared; using either (1) YIELD, or (2) lodging as sole criterion of selection, and (3) independent culling for YIELD and lodging. Using (3), lines were selected from the (HG x Mo44)TCsyns, and Syn N(HG x Mo44) was synthesized. In 1992 the original populations, the (HG x Mo44)TCsyns, synthetics of full-sibs and S$\sb1$'s derived from (HG x Mo44)TCsyns, and the check (NSSS(C$\sb7)$) were evaluated in two stress environments. For YIELD, and lodging there were no statistically significant differences between crosses of S$\sb3$ lines x Mo44 and checks. (HG x Mo44)TCsyns had significantly greater YIELD, and reduced lodging than the original populations. Plant and ear height, and days to male flowering were significantly reduced, except for SynOM. Mo44 negatively modified synchronization between male and female flowering. Based on expected response to selection, independent culling was more efficient for increasing YIELD, and reducing lodging than selection based on a single trait selection. Across environments, Syn N(HG x Mo44) had greater YIELD, less lodging, and better stability than the average of the original populations, the average of (HG x Mo44)TCsyns, and NSSS(C$\sb7).$
Subject Area
Agronomy|Genetics|Biostatistics
Recommended Citation
Ramirez-Diaz, Jose Luis, "Breeding for lodging resistance in maize populations derived from the variety Hays Golden" (1993). ETD collection for University of Nebraska-Lincoln. AAI9402401.
https://digitalcommons.unl.edu/dissertations/AAI9402401