Divergent selection for grain protein affects nitrogen use in maize hybrids

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Physiological N response of field-grown maize hybrids (Zea mays L.) with divergent yield potential and grain protein concentration (2009, background): “…hybrid (FR1064 x LH185), and an experimental high protein hybrid (FR1064 x IHP), known to exhibit different N use and productivity characteristics (Uribelarrea et al. 2004, 2007) where grown under four levels of fertilizer N supply ranging from deficient to more than adequate (0, 56, 112, and 224…”
Diverse concepts of breeding for nitrogen use efficiency. A review (2017, result): “Similar findings were described by Uribelarrea et al. (2007) who found that selection for either high or low grain protein can lead to genotypes that are similar in overall NUE at maturity but are different in the underlying mechanisms: high protein strains had the highest values for N uptake…”
A comprehensive study of plant density consequences on nitrogen uptake dynamics of maize plants from vegetative to reproductive stages (2011, background): “Substantial genetic ariability for adaptation to low and high soil N supply was also Research 121 (2011) 2–18 3 observed in other research (Paponov and Engels, 2003; Paponov et al., 2005; Uribelarrea et al., 2007, 2009).”