Abstract
The occurrence of glutamine synthetase isoforms in the green hydra symbiosis has been investigated using ion-exchange chromatography. There were three isoforms which were designated algal cytosolic, chloroplastic and host isoenzymes. Comparison of the proportions of algal isoforms from the intact association with those from nitrogen-replete and nitrogen-starved cultures of a Chlorella strain originally isolated from green hydra, suggests that symbionts in the intact association may be nitrogen-deficient.
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