Abstract
Levels of glutamine synthetase (GS) biosynthetic activity, GS protein and GS mRNA were compared in the parent strain of Anabaena variabilis and in ammonia-liberating mutant strains (ED81 and ED92) which are resistant to ethylenediamine (EDA). GS activity, protein and mRNA levels were all reduced in ED92 whereas ED81 had levels of GS protein and mRNA similar to those of the parent strain but had much reduced GS biosynthetic activity. These findings are discussed in relation to the type of mutation occurring within in each mutant strain and in relation to the reduced GS activity in the Anabaena-Azolla symbiotic association.
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