| Popis: |
Summary The nodulation efficiencies of six mutant strains of Rhizobium japonicum 61A76, selected on the basis of the deficiency of their terminal cytochrome oxidase, were determined by measurements of acetylene reduction, leghaemoglobin and C/N ratio of soybean Glycine max cv. Williams. Mutants which are totally deficient in cytochrome aa3 and c with reduced amount of cytochrome b were symbiotically infective, but form ineffective nodules, whereas mutants which are deficient in cytochrome aa3 or have reduced levels of all cytochromes were almost effective or less effective in nitrogen fixation as compared with the wild type. The cytochrome content of the bacteriods of the wild type and mutant strains were almost similar to those found in cultured cells. |
