Asparagine and ureide accumulation in nodules and shoots as feedback inhibitors of N2 fixation in soybean

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Drought tolerance and yield increase of soybean resulting from improved symbiotic N2 fixation (2007, background): “It has been demonstrated directly in feeding experiments that soybean plants fed ureides have substantially decreased N2 fixation rates (Vadez et al., 2000).”
The future of grain legumes in cropping systems (2012, background): “While the detailed biochemical sensitivity has not been fully resolved, experimental feeding of plants with amino acids can result in dramatic decreases in fixation rate (Vadez et al. 2000).”