Novel classes of mutants of the cyanobacterium Nostoc muscorum showing absolute requirement of Cs+ or Rb+ for diazotrophy

Bhargava, Santosh K.; Singh, H. N.

doi:10.2323/jgam.50.101

Cited by 2 publications

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“…It is therefore concluded that Cs + inhibition of cyanobacterial diazotrophy is due to its exclusive inhibitory effect on nitrogenase activity. This interpretation of diazotrophic specific Cs + toxicity is in agreement with similar interpretations of SINGH et al (1997) and BHARGAVA and SINGH (2004). Table 2 Effect of graded concentration of CsCl and RbCl on glutamine synthetase (biosynthetic) activity (n mol NADH oxidized mg -1 protein min -1 ) and photosynthetic O 2 evolution (µ mol O 2 evolved mg -1 Chl a) of the parent N. muscorum and its Cs + -R mutant strains The Cs + uptake pattern in the parent (dark bars) and in the Cs + -R mutant (light bars).…”

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confidence: 93%

Auxotrophic mutant of the cyanobacterium Nostoc muscorum showing absolute requirement of Cs⁺ or Rb⁺ for diazotrophy and autotrophy

Bhargava

Chauhan²,

Patil³

et al. 2006

J. Basic Microbiol.

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Caesium-resistant (Cs(+)-R) mutant clones of the cyanobacterium Nostoc muscorum were characterized for diazotrophic growth in a medium devoid of Cs(+) or Rb(+) or both. Cs(+)-R phenotype suffered severe genetic damage of a pleiotropic nature affecting diazotrophic growth, chlorophyll a content, nitrogenase activity and photosynthetic O(2) evolution. Mutation leading to development of Cs(+)-R phenotype could be overcome by availability of Cs(+)/Rb(+). Parent and mutant strains were similar with respect to their Cs(+)/Rb(+) uptake. Available data suggests operation of an efficient coupling of the two incompatible reactions viz. oxygenic photosynthesis and oxygen sensitive N(2) fixation in this cyanobacterium.

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Section: Discussionsupporting

confidence: 93%

Auxotrophic mutant of the cyanobacterium Nostoc muscorum showing absolute requirement of Cs⁺ or Rb⁺ for diazotrophy and autotrophy

Bhargava

Chauhan²,

Patil³

et al. 2006

J. Basic Microbiol.

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Caesium uptake and toxicity in the cyanobacterium Nostoc muscorum

Bhargava

2006

World J Microbiol Biotechnol

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A NH 4 + transport-defective mutant and a K + transport-defective mutant of the cyanobacterium Nostoc muscorum were analysed with regard to percentage survival as a function of CsCl toxicity and Cs + uptake activity. Neither survival nor Cs + uptake was affected in either of the two mutants when compared with the wild type. The results indicate that the toxicity of Cs + is determined at more than one cellular site in this organism.

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Novel classes of mutants of the cyanobacterium Nostoc muscorum showing absolute requirement of Cs+ or Rb+ for diazotrophy

Cited by 2 publications

References 10 publications

Auxotrophic mutant of the cyanobacterium Nostoc muscorum showing absolute requirement of Cs⁺ or Rb⁺ for diazotrophy and autotrophy

Auxotrophic mutant of the cyanobacterium Nostoc muscorum showing absolute requirement of Cs⁺ or Rb⁺ for diazotrophy and autotrophy

Caesium uptake and toxicity in the cyanobacterium Nostoc muscorum

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Novel classes of mutants of the cyanobacterium Nostoc muscorum showing absolute requirement of Cs+ or Rb+ for diazotrophy

Cited by 2 publications

References 10 publications

Auxotrophic mutant of the cyanobacterium Nostoc muscorum showing absolute requirement of Cs+ or Rb+ for diazotrophy and autotrophy

Auxotrophic mutant of the cyanobacterium Nostoc muscorum showing absolute requirement of Cs+ or Rb+ for diazotrophy and autotrophy

Caesium uptake and toxicity in the cyanobacterium Nostoc muscorum

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Auxotrophic mutant of the cyanobacterium Nostoc muscorum showing absolute requirement of Cs⁺ or Rb⁺ for diazotrophy and autotrophy

Auxotrophic mutant of the cyanobacterium Nostoc muscorum showing absolute requirement of Cs⁺ or Rb⁺ for diazotrophy and autotrophy