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Characteristics of thermoluminescence (TL) glow curves were studied in thylakoids isolated from pea leaves after an exposure to very high light in the TL device. The inhibition of photosynthesis was detected both as decreases of oxygen evolution rates and of variable fluorescence. In another more classical experiment, leaves were exposed to high light at low temperature (5 °C) for 4 h and recovery of normal PS II characteristics were followed during a 20 h time period under low light at 20 °C. TL study was performed on thylakoids isolated from these leaves. Charging of bands was performed by an illumination at low temperature ( - 8 0 °C). Illumination at low temperature ( - 8 0 °C) induces 2 types of TL bands called Z variable (Z v ) band peaking at about -70 °C and a classical B band peaking at 35 °C. B band is ascribed to recombination in pairs S 2/3 Q B  - , whereas the origin of Z v  bands remains unclear. Modified Z v  bands, with flat shape and presenting a large part resistant to ethanol, were evidenced after some minutes of dark adaptation, both in light-exposed thylakoids and in thylakoids isolated from photoinhibited leaves. This ethanol resistant part in Z v  band was only induced by photoinhibitory treatment performed under aerobic conditions (21% O 2  in media), both in vitro and in vivo; thus, the appearance of the special Z v  band would be related to an oxidative process accompanying photoinhibition. B bands presented reduced sizes and a shift of peak maximum of about 5 °C after some minutes of dark adaptation. In vivo, the recovery of a high PS II activity and of B bands displaying normal characteristics occurs parallely to reappearance of Z v  bands with normal shape and with a vestigial ethanol resistant band

zeitschrift für naturforschung c

In Pea Thylakoids, A Special Thermoluminescence Band Was Observed At Low Temperature After Photoinhibitory Treatments Performed Under Aerobic Conditions, Either In Vivo (In Leaf) Or In Vitro