Experimental study reveals selective stigma damage and reduced phototaxis in Euglena gracilis under weak ultrasound, suggesting distinct subcellular vulnerability to acoustic stress.
SUMMARY The effects of weak ultrasound irradiation (20 ÷ 200 mw/cm2; ν = 20 kHz) on Euglena gracilis Klebs (Flagellata Euglenoidina) have been investigated from the morphological as well as from the physiological point of view. The aim was to clarify if and how the different subcellular components are differentially damaged and how morphological modifications can affect the photomotile responses of the cells. The experimental results suggest that light sonication induces in Euglena gracilis morphological modifications which can be clearly observed only at the electron microscope. The selective and particularly apparent damage to the stigma globules seems to be related to the relatively small diminution in phototactic activity of the cells.
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Checcucci et al. (2013) studied this question.
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