Abstract
A comparative study was conducted on the effect of NH4Cl on growth, vesicle formation and formation of nitrogenase of Frankia strains Cc1.17 and Cp1.2, derived from root nodules of Colletia cruciata and Comptonia peregrina, respectively. On a medium without combined nitrogen (“P-N”), both strains formed spherical cells, called vesicles, like many other Frankia strains. Data are presented on the number of vesicles per mg protein, after cultivation in media with sodium propionate as C-source without combined nitrogen (“P-N”) or with 0.2 g NH4Cl/l (“P+N”). Strain Cp1.2 as may other Frankia strains, showed on “P+N” medium a very strong reduction of vesicle formation of 99% relative to the number of vesicles formed on “P-N” medium, after 11 days growth. However, in strain Cc11.17 this reduction was only 70%. The occurence of relatively large numbers of vesicles in “P+N” media has not yet been reported for other Frankia strains. No acetylene reduction activity was found in NH +4 -grown cells. The regulation of induction of nitrogenase in Frankia by NH4Cl was tested by immuno-gelectrophoresis using antisera against nitrogenase of Rhizobium leguminosarum PRE. The component I of the enzyme showed crossreactivity while the component II had only a weak crossreaction. The experiments indicated that no nitrogenase was detectable in the NH +4 -grown cells. For the localization of nitrogenase, relative amounts of the enzyme were compared in whole cells and vesicle-enriched fractions. Western blots showed a significant enrichment of nitrogenase in the vesicle fractions, which indicated that most of the nitrogenase was localized in the vesicle.
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Meesters, T.M., van Genesen, S.T. & Akkermans, A.D.L. Growth, acetylene reduction activity and localization of nitrogenase in relation to vesicle formation in Frankia strains Cc1.17 and Cp1.2. Arch. Microbiol. 143, 137–142 (1985). https://doi.org/10.1007/BF00411036
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DOI: https://doi.org/10.1007/BF00411036