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    Survival in the dark: strategies adopted by Tetraselmis indica (Chlorodendrophyceae, Chlorophyta)

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    Mar_Biol_Res_14_448a.pdf (1.171Mb)
    Date
    2018
    Author
    Naik, S.M.
    Anil, A.C.
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    Abstract
    The adaptive strategy of Tetraselmis indica to survive darkness was evaluated over a period of 182 days. Resting cells formation and reduction in catabolic activity facilitated dark survival and their rejuvenation. The occurrence of thick-walled cells (type 1) and thin-walled cells with the condensed chloroplast (type 2) in light-dark and dark conditions respectively indicated differential resting cell formation. The dissolved organic carbon remained nearly constant throughout the dark period signifying T. indica did not favour heterotrophy. Upon re-illumination of dark-adapted cells, the lag phase lengthened from 2 to 28 days when darkness period increased from 8 to 182 days, respectively. However, this negative influence on growth was compensated by an increase in growth rate from 0.35 to 0.95 d-1. This resurgence capability of T. indica after six months of dark exposure and distinctive resting cell formation indicate a differential population sustenance mechanism. Further elucidation of dark adaptability and survival strategies in T. indica may have significance in ecological and evolutionary processes
    URI
    https://doi.org/10.1080/17451000.2018.1464188
    http://drs.nio.org/drs/handle/2264/8015
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