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AbstractLINDBLAD, P. (Department of Physiological Botany, University ofUppsala, Box 540, S-75121 Uppsala, Sweden). Nitrogen and carbon metabolism in coralloid roots of cycads. Memoirs¬†of the New York Botanical Garden 57: 104√Ę‚ā¨‚Äú113. 1990. Filamentous heterocystous cyanobacteria¬†of the genus Nostoc are found in a zone between two cortex layers within cycad¬†coralloid roots. The zone is traversed by elongated cycad cells, supposedly involved in the¬†transfer of metabolites between the symbionts. Nitrogen fixation was maximal in the growing¬†tip and declined towards basal parts of the root. In contrast, the heterocyst frequency¬†gradually increased towards basal, older parts and formation of multiple heterocysts commenced¬†simultaneously. The inverse relationship between nitrogen fixation and total heterocyst¬†frequency indicates a high frequency of inactive heterocysts in the multiple complexes,¬†especially since nitrogenase activity correlates well with the frequency of single¬†heterocysts. As in free-living cyanobacteria, nitrogenase occurred in the heterocysts only.¬†The activity and cellular/subcellular localization of the primary ammonia assimilating enzyme,¬†glutamine synthetase, was comparable to that of free-living cyanobacteria. Moreover,¬†glutamate synthase showed full in vitro activity, suggesting that the nitrogen metabolite¬†transferred from the cyanobiont to the cycad may be a product of ammonia assimilation.¬†The light harvesting phycobiliprotein phycoerythrin was present in the vegetative cells,¬†although the cyanobionts occur in darkness. The absence of light was, however, manifested¬†by no in vivo CO2-fixation. However, both ribulose 1,5-bisphosphate carboxylase and phosphoribulokinase¬†activities were found in cell-free extracts.




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