Abstract
Navicula grimmei andNitzschia palea occurring almost equally in a mixed population on department moist garden soil surface when maintained in fresh supernatant (of soil-water medium) at pH 7.0, temperature of 26 ± 1 °C and under continuous light (intensity of ≈30 µmol m−2 s−1) in a culture chamber exhibited a similar cell survival period (of 28 d) and percentage (at the beginning 100 % and mid of survival period 65 %) and stop gliding 11 d prior to cell death (with gliding speed reduced in both from 204–330 µm/min at the beginning to 82.5–99 µm/min at the mid of gliding period) irrespective of their size differences. However, a sharp fall in the cell gliding period, gliding cell percentage and speed occurred at various levels (different from cell survival period and percentage) in both diatoms in a similar extent under water stress (2, 4 and 6 % agarized supernatant, liquid supernatant with 0.2–1.0 mol/L NaCl, blot-dryness of cells for 5–15 min), pH extreme of liquid supernatant (≤5.0, ≥9.0), temperature extremes in liquid supernatant (≤15, ≥40 °C), UV exposure (0.96–5.76 kJ/m2), lack of all nutrients from the medium (double distilled water), darkness or low light intensities (2 and 10 µmol m−2 s−1), presence of ‘heavy’ metals (Ni, Cu, Zn, Co, Fe, Hg; 1–200 ppm), organic substances in liquid supernatant (DDT, captan, urea, 2,4-D, 100–2000 ppm; thiourea, 50–1000 ppm).N. palea sway (turn around at either ends) or not only when gliding but independent of cell gliding speed, which decreased continuously under all conditions.
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Abbreviations
- CGP:
-
cell gliding period
- CGS:
-
cell gliding speed
- CSP:
-
cell survival period
- GC%:
-
gliding cell percentage
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Gupta, S., Agrawal, S.C. Survival and motility of diatomsNavicula grimmei andNitzschia palea affected by some physical and chemical factors. Folia Microbiol 52, 127–134 (2007). https://doi.org/10.1007/BF02932151
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DOI: https://doi.org/10.1007/BF02932151