FIGURE 6.

Time course of nodule H₂ evolution during changes in the external oxygen concentration around nodules of Mt-wild type and mutant plants, carrying an insert in the cds of Medtr1g084050 (nicotianamine synthase-like protein). Data were taken every 12 s for a period of about 160 min, including 30 min of elevated external oxygen concentration. (A) Shows nodule H₂ evolution as μmol H₂ per hour and plant, while the data in (B) are given as % of the value at the beginning of the shown measurement. Data are the mean value of five replicates. The plants of the wild type and the mutant were five and 10 weeks old respectively, at which age they had comparable per plant nitrogen fixation rates.