Abstract
The processes of NH4+uptake and induced NH4+excretion in the Azolla-Anabaena symbiosis were studied. Uptake rates in accessions of Azolla microphylla and A. mexicana were similar. No pH optimum for NH4+uptake was observed. Rates of N excretion induced by methionine sulfoximine were also similar. When A. caroliniana was subjected to the herbicide Ignite (Hoechst-Roussel), more NH4+was initially released than with methionine sulfoximine treatment. Glutamine synthetase was not completely suppressed.
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