EVALUATION OF BLUE-GREEN ALGAE | BIONATURE

In the absence of appropriate Precambrian fossil data, the importance of cultural studies in unravelling the riddle of blue-green algal evolution has been recognised. Recognizing the relevance of mutagenesis in revealing genetic variability and shedding information on ontogeny, the author has developed a new hypothesis to support the retrogressive perspective of prokaryotic algae evolution. The effect of Naja naja venom on the development of heterotrichous, multiseriate filaments with both false and true branching in otherwise uniseriate, unbranched filamentous alga, Anabaena doliolum, suggests that a member of Nostocales has given rise to the Stigonematalean characteristics by reverting to the old evolutionary pattern, indicating the order's primitiveness. Blue-green algae and photosynthetic bacteria are thought to have evolved monophyletically from heterotrophs in the Lower Precambrian, with blue-green algae evolving in diphyletic lines, one giving rise to coccoid forms and the other to filamentous forms.

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