Ev. Ermilova et al., CHEMOTAXIS AND ITS CORRELATION WITH PHOTO RESPONSE IN CHLAMYDOMONAS-REINHARDTII STRAIN WITH NEGATIVE PHOTOTAXIS, Izvestia Akademii nauk SSSR. Seria biologiceskaa, (4), 1997, pp. 500-503
A positive chemotaxis to sugars (maltose, sucrose, and xylose) and man
nite has been studied by the capillary method in a Chlamydomonas reinh
ardtii strain 495 with negative phototaxis. Addition of an attractant
to the suspension of mobile cells temporarily inhibited the photorespo
nse at light intensity of 6 and 18 W/m(2), while at 90 W/m(2) no inhib
itory effect of the attractant was observed. The phototaxis response w
as completely restored after a period of time necessary for cell adapt
ation to a chemical effector. Adaptation time was 15-20 min in our exp
eriments. Glucose did not serve as an attractant for mobile Chlamydomo
nas cells and did not affect their photoresponse. Chemotaxis was simil
ar in the Chlamydomonas wild type strain and the mutant one with negat
ive phototaxis.