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Characterization of a symbiotic, heterocystous, N2-fixing cyanobacterium fromCycas coralloid roots

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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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Authors and Affiliations

  1. Department of Biochemistry, College of Basic Sciences and Humanities, G.B. Pant University of Agriculture and Technology, 263 145, Pantnagar, Uttar Pradesh, India

    A. Sharma & D. P. Mishra

  2. the Centre of Advanced Studies in Botany, Banaras Hindu University, Varanasi, India

    A. Kumar

Authors
  1. A. Sharma
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  2. D. P. Mishra
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  3. A. Kumar
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Sharma, A., Mishra, D.P. & Kumar, A. Characterization of a symbiotic, heterocystous, N2-fixing cyanobacterium fromCycas coralloid roots. World J Microbiol Biotechnol 8, 529–531 (1992). https://doi.org/10.1007/BF01201954

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  • DOI: https://doi.org/10.1007/BF01201954

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