Intra- and interspecific variation for nitrogen fixing potential in Tolypothrix germplasm

Prasanna, R. and Mohammadi, S. A. and Prasanna, B. M. and Singh, P. K. (2002) Intra- and interspecific variation for nitrogen fixing potential in Tolypothrix germplasm. Acta Botanica Hungarica, 44 (3-4). pp. 383-392. ISSN 0236-6495

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Abstract

Twenty cyanobacterial strains of the genus Tolypothrix, including 15 strains of T. tenuis, three strains of T. ceylonica, and one each of T. nodosa and T. bouteillei, that were collected from various agro-ecological regions of India were evaluated for important parameters related to nitrogen fixing potential, such as acetylene reduction activity, total protein and chlorophyll content. Distinct differences were observed in nitrogen fixing potential at both inter- and intraspecific levels. The T. tenuis strains, in general, exhibited superior nitrogen fixing ability as compared to strains belonging to other species. A statistical procedure based on simultaneous consideration of performances of various strains with respect to different parameters under study aided in identification of three highly promising T. tenuis accessions, namely ARM586, ARM75 and ARM460, for potential exploitation as biofertilisers.

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