Abstract
ABSTRACT Batch cultures of cyanobacteiium Anacystis nidulans were analyzed continuously for changes in growth and cell composition in relation to boron supply. The lack of boron in the medium had no effect on the growth of this cyanobacterium and on the contents of the organic fractions: chlorophyll, protein and nucleic acids. In addition the growth of Anacystis nidulans in a boron-free medium was neither stimulated nor inhibited by the addition of boron in amounts up to 1.0 mg · 1−1. The uptake of nitrate was similarly unaffected. In view of these results, it is concluded that boron is a non-essential micronutrient for Anacystis nidulans.
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