One hundred and twenty-nine mutants of Azospirillum brasilense strain Sp6, resistant to methylammonium, were isolated. Three of the mutants were found to be able to reduce acetylene in the presence of 4 mM ammonium or 120mM methylammonium, concentrations which strongly reduced the nitrogenase activity of the parental strain. Under N2-fixing conditions, two mutants failed to switch off nitrogenase when NH4Cl was added. Moreover, the three mutants showed a reduced capacity to incorporate [14C]methylammonium. The level of glutamine synthetase activity found in the mutants was not reduced as compared to that of the parental strain. All of the data indicate an impairement in the mechanism of ammonium uptake by the bacterial cell.

Mutants of Azospirillum brasilense resistant to methylammonium / L. Turbanti; M. Bazzicalupo; E. Casalone; R. Fani; E. Gallori; M. Polsinelli. - In: ARCHIVES OF MICROBIOLOGY. - ISSN 0302-8933. - STAMPA. - 150:(1988), pp. 421-425.

Mutants of Azospirillum brasilense resistant to methylammonium

TURBANTI, LUCA;BAZZICALUPO, MARCO;E. Casalone;FANI, RENATO;GALLORI, ENZO;POLSINELLI, MARIO
1988

Abstract

One hundred and twenty-nine mutants of Azospirillum brasilense strain Sp6, resistant to methylammonium, were isolated. Three of the mutants were found to be able to reduce acetylene in the presence of 4 mM ammonium or 120mM methylammonium, concentrations which strongly reduced the nitrogenase activity of the parental strain. Under N2-fixing conditions, two mutants failed to switch off nitrogenase when NH4Cl was added. Moreover, the three mutants showed a reduced capacity to incorporate [14C]methylammonium. The level of glutamine synthetase activity found in the mutants was not reduced as compared to that of the parental strain. All of the data indicate an impairement in the mechanism of ammonium uptake by the bacterial cell.
1988
150
421
425
L. Turbanti; M. Bazzicalupo; E. Casalone; R. Fani; E. Gallori; M. Polsinelli
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/401993
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