ISSN:
1432-072X
Keywords:
Photosensory
;
Cations
;
pH
;
Flagellated
;
Algae
;
Adaptation
;
Euglena gracilis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Euglena were cultured under 3 W m-2 constant white light. In culture medium, cells show immediate and long lasting step-down photophobic responses and photoaccumulation behavior to blue light if dim red light-adapted for 30 min. However, if cells are suspended in buffered, saltcontaining solutions (adaptation buffers), strong step-down photobehavior and photoaccumulation responses are not observed for several hours. These behaviors gradually increase in strength to reach a maximum after 6–12 h; after which a stable response is maintained. The relative rates of appearance and the relative strengths of the responses are influenced by the concentrations of Ca2+ and K+, but not H+ or Na+ ions, in the adaptation buffers. Expression of the stepdown photobehavior thus requires that the cells adapt to the chemical environment in which they are suspended.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00407758
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