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Characteristics of Thermoluminescence Bands of Euglena Cells Belonging to 2 Lines Presenting Different Degrees of Diuron-Resistance

Abstract We have analysed the thermoluminescence (TL) properties of two lines of Euglena exhibiting two degrees of resistance to diuron, by a factor of 100 (ZR 25) and 1000 (ZR 250) respectively, as compared to wild type line (Z). In addition, the two ZR lines developped an identical resistance to atrazine since the I50 for this herbicide in each line was 75 times larger than in wild type. Special TL characteristics were evidenced in the two lines. Bands after 2 flashes (or more) showed a shift of the peak maximum towards low temperature, the shift being the largest in the most DCMU-resistant cells. Similar results were obtained with isolated thylakoids, except that the TL bands appeared at a temperature higher than in corresponding cells. Oscillations in the amplitude of the bands in a flash sequence were largely damped in cells (and thylakoids), particularly in the most DCMU-resistant lines. The results are interpreted as indicating accumulation of Qᴀ −Qʙ after flashes due to a decrease of the equilibrium constant for the reaction Qᴀ − Qʙ ⇄ QᴀQʙ− accompanying the DCMU resistance.