Factors modulating differentiation of spores: Characterization of mutants defective in sporulation in the cyanobacterium Anabaena doliolum (AdS strain)
| ISSN: |
1617-4623
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| Keywords: |
Anabaena doliolum ; Sporulation ; Mutants ; Nitrogen fixation ; Cell constituents
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| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Biology
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| Notes: |
Summary Mutants of Anabaena doliolum (AdS strain) altered with respect to the time of initiation and degree of sporulation were isolated following mutagenesis with N-methyl-N′-nitro-N-nitrosoguanidine and hydroxylamine. The non-sporulating mutant showed a high phycocyanin (Pc): chlorophyll a (chl a) ratio (ca. 7.2) as compared to sporulating strains (Pc:chl a, 4.7–5.3). Also this strain seemed to have higher RNA pools per unit of genomic material as reflected in a higher RNA:DNA ratio. The data suggest that degradaton of phycocyanin and controlled RNA synthesis are prerequisites for sporulation. Mutants exhibiting non-sporulation and delayed initiation of sporulation accumulated more nitrogen through nitrogen fixation, probably indicating nitrogenase function over an extended vegetative phase.
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| Type of Medium: |
Electronic Resource
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| URL: |