Abstract
All 3–10-d-oldOscillatoria salina filaments glide with the speed of 323–330 µm/min (BG 11 medium, pH 7.5, 21±2 °C, continuous light intensity of ≈30 µmol m−2 s−1) in a culture chamber. However, a time bound progressive decrease in gliding speed and in percentage of gliding filaments occurred, depending upon the severity of different stress factors studied,viz. water stress (2–8 % agarized media, liquid media with 0.2–1 mol/L NaCl, blot-dryness of filaments for ≥5 min), temperature shock (5, 40 °C for ≥5 min; 35 °C for ≥15 min), darkness and low light intensity (2, 10 µmol m−2 s−1), UV exposure (0.96–3.84 kJ/m2), pH extremes (≤6.5 and ≥9.5), lack of all nutrients from liquid medium (double distilled water), presence of ‘heavy’ metals (1, 25 ppm Fe, Cu, Zn, Ni, Co, Hg) or organic substances in liquid medium (25, 250 ppm 2,4-D, captan, urea, DDT, thiourea). This feature of the alga (i.e. reduction in speed and percentage of gliding filaments depending upon severity of stress conditions) may thus be suggested to be used in assessing water quality.
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Gupta, S., Agrawal, S.C. Motility inOscillatoria salina as affected by different factors. Folia Microbiol 51, 565–571 (2006). https://doi.org/10.1007/BF02931621
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DOI: https://doi.org/10.1007/BF02931621