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Updated: May 4, 2026

Isolation and Characterization of Intact Phycobilisome in Cyanobacteria
Published on: November 10, 2021
Characterization of a symbiotic, heterocystous, N2-fixing cyanobacterium fromCycas coralloid roots
A Sharma1, D P Mishra, A Kumar
1Department of Biochemistry, College of Basic Sciences and Humanities, G.B. Pant University of Agriculture and Technology, 263 145, Pantnagar, Uttar Pradesh, India.
Abstract:
A symbiotic, heterocystous, N2-fixing blue-green alga, isolated from the coralloid roots of a xerophytic plant,Cycas revoluta, grew best in liquid medium supplemented with 4 mM NO 3 (-) . Morphologically, the isolated alga was identical to that of the natural endophyte but the cell size had decreased markedly. The alga was heterotrophic. Intact coralloid roots had nearly 4 to 5 times more nitrogenase activity compared with natural- and laboratory-grown agla but nitrate reductase was inducible in both the forms. Plasmid(s) were found in both algal forms.
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