ISSN:
1432-072X
Keywords:
Photosensory
;
Anions, flagellated
;
Algae
;
Motility
;
E. gracilis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The motility and step-down photophobic responses of Euglena are influenced by inorganic and organic anions. Persistent motility (with Ca2+, Mg2+ and K+ present) is supported with chloride or sulfate but not with acetate, nitrate or propionate as the only added anions. Cells in media containing acetate displayed a cell aggregation (clumping) behavior that was both red light sensitive and, under some conditions, was accompanied by suppression of the step-down photophobic response. Addition of sodium salts (Cl-, SO 4 2- , acetate or propionate) to cells in Cl- or SO 4 2- based media had differential effects on the duration of the step-down photophobic responses induced by blue light removal: anions alter the response. In addition, cells in all Cl- containing media showed constant photophobic response duration following repeated stimulation. Cells in some SO4 2- containing media, however, showed response summation to repeated stimulation. This latter effect was reversible and was overcome by the addition of chloride anions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00410899
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