Vegetative survival, akinete formation and germination in three blue-green algae and one green alga in relation to light intensity, temperature, heat shock and UV exposure |
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Authors: | S C Agrawal V Singh |
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Institution: | (1) Department of Botany, University of Allahabad, Allahabad, India |
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Abstract: | The mere vegetative survival was not sufficient but suitable growth conditions were required for akinete formation to occur
in the blue-green algaeAnabœna iyengarii, Westiellopsis prolifica, Nostochopsis lobatus and in the green algaPithophora oedogonia. In all algae, akinetes were neither formed nor germinated in darkness, and while dim light of 300 lx was sufficient for
most of akinetes to germinate and also to maintain vegetative survival, it was not adequate for optinum akinete formation.
Although akinetes of all algae could germinate at 35°C, both the vegetative survival and akinete formation were markedly suppressed
at this temperature. Heat or UV shock of any level, whether ineffective or effecting vegetative survival, did not promote
akinete formation or germination in any alga tested. Akinetes of all algae under study were relatively tolerant to heat and
also to some extent to UV. Both wet and dried akinetes of all algae were equally UV tolerant. In all algae, the viability
of both wet and dried akinetes decreased more or less equally with storage time, but the decrease was more drastic when storage
temperature was progressively lowered from 20 to 0°C. Hence the akinetes can tolerate dryness but not frost. |
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