In soybean nodules, the ATP level and ATP/ADP ratio decreased significantly upon the supply of nitrate. Inhibition of nitrogen fixation by nitrate was caused by a decrease in oxidative phosphorylation attributable to the accumulation of nitrosylleghemoglobin in the presence of nitrate. The synthesis of other nucleotides and UDP-sugar was also affected.
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Kanayama et al. (1990) studied this question.