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Title: Effects of diurnal fluctuation of temperature on growth, photosynthetic activity response of two morphotypes cells of Emiliania huxleyi
Authors: Brito, Miriam Lorene Martins
Han, Wang Qiao
Li, Gong Qing
Keywords: Calcified cells (C-Cells);Coccoliths;Emiliania huxleyi (E. huxleyi);Morphotypes cells;Naked cells (N-Cells);PAM fluorometry
Issue Date: Mar-2019
Publisher: NISCAIR-CSIR, India
Abstract: The effects of different thermal regimes on growth and physiological performance of the marine microalgae Emiliania huxleyi were studied . Two morphological distinct strains, one coccoliths-bearing cells called Calcified cells and one non-motile naked cells, were allocated to four different experimental groups. The groups were submitted to constant temperature of 20 °C and three different daily fluctuation ranges of temperature: a lower range of 20±2 °C, an intermediate range of 20±4 °C and the last higher range of 20±6 °C. This investigation demonstrated that there is a correlation between degree of calcification and photosynthesis. The cells with a decreased level of calcification resulted in a down regulation of photoprotective mechanisms. The cells grew high extent for all levels of fluctuation, presenting elevated concentrations at higher temperature amplitude. Elevated temperature shifts (20±6 °C) increased photosynthetic activity on both morphotypes strains of E. huxleyi.
Page(s): 349-356
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.48(03) [March 2019]

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