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PckA expression partially restores symbiotic N2 fixation to S. meliloti dme mutants. (A) Nitrogenase activity (acetylene reduction in μmol h−1 plant−1). (B) Shoot dry weights per plant. Plants were harvested 6 weeks after inoculation. Panels A and B represent two independent experiments with triplicate pots per strain and eight plants per pot; values are means ± SEM for triplicate samples.
