Premium
Circadian Rhythm Changes in Autotrophic Euglena Induced by Organic Carbon Sources *
Author(s) -
FELDMAN JERRY F.,
BRUCE VICTOR G.
Publication year - 1972
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1972.tb03479.x
Subject(s) - autotroph , euglena gracilis , circadian rhythm , euglena , mixotroph , phototaxis , period (music) , rhythm , chemistry , photochemistry , biology , biophysics , biochemistry , botany , heterotroph , bacteria , chloroplast , medicine , physics , endocrinology , gene , genetics , acoustics
SYNOPSIS. Acetate added to autotrophic Euglena cultures changed the period length of the circadian rhythm of phototaxis. Phase shifts were induced by acetate pulses. Since transition from one metabolic state to another (autotrophic/mixotrophic) caused a phase shift or a period change, such effects possibly result from switching metabolic pathways. As suggested (Brinkmann, K., 1966. Planta 70 , 344–89), differences in the temperature responses of the rhythm in mixotrophic and autotrophic cells might also be caused by participation of different metabolic pathways with different Q 10 values, e.g. dark reactions vs photochemical reactions. However the Q 10 of a given dark reaction, e.g. protein synthesis, can differ in the 2 states. Therefore temperature experiments alone do not suffice for deciding whether the pathways include photochemical reactions, dark reactions, or both.