Abstract

SUMMARY Anabaena showed a seasonal difference in nitrogen storage when growing in Cycas revoluta coralloid roots. In winter Anabaena had numerous cyanophycin granules while in summer there were few cyanophycin granules and many degenerate algal cells. Cellular protrusions were present in the developing algal zone of coralloid roots which may facilitate metabolic exchange between the host and phycobiont. By ferric chloride ultrahistochemistry, phenolic deposits were found in the mucilaginous material of the algal zone. Phenolic deposits were also found in adjacent cells on the plasma membrane, endoplasmic reticulum, within plastids, and at the periphery of coralloid roots. The distribution of phenolic constituents could therefore provide a mechanism for excluding micro‐organisms and permitting only Anabaena to grow in cycad coralloid roots.

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