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Nodule formation in the presence of ACC. Seedlings grown in the presence or absence of ACC were inoculated with B. japonicum strain USDA110 3 d after germination. The number of nodules present on root systems of individual plants was recorded 14 d after inoculation (A), and the distance from the uppermost lateral root to the lowest nodule was noted (B). Data are presented as means ± a 95% confidence interval. ○, Wild type (Hobbit 87); •, etr1-1 (T119N54).
