The present study was undertaken in thirty cyanobacterial strains
of Calothrix (family Rivulariaceae) to analyse their
morpho-physiological and molecular relatedness. These strains
including reference strain (UTEX 379) were procured from culture
collection of Centre for Conservation and Utilisation of Blue Green
Algae, IARI, New Delhi INDIA. Most of the forms were planktonic or
free floating while some exhibited benthic growth behaviour.
Variation in colour of thallus was expressed distinctly and the
colour ranged from brown, blackish green to dark green. Large
number of strains grew as floccose masses while some grew as
spreading and few formed evenly distributed suspension. Microscopic
examination revealed that the trichomes grew as densely
entangled/distinctly or slightly constricted except in few where
trichomes were irregularly straight or bent. The present analysis
undertaken with different strains of Calothrix using
morpho-physiological and molecular approaches, have clearly
indicated a high degree of genetic diversity as well as
relatedness.
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