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'Photoinhibition' in keywords Facet   Publication Year 1992  [X]
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1Author    Jack FarineauRequires cookie*
 Title    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  
 Abstract    Characteristics o f 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 o f p h oto­ synthesis was detected both as decreases o f oxygen evolution rates and o f variable fluores­ cence. In another more classical experiment, leaves were exposed to high light at low tempera­ ture (5 °C) for 4 h and recovery o f 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 o f bands was performed by an illumination at low temperature (-8 0 °C). Illumination at low temperature (-8 0 °C) induces 2 types o f TL bands called Z variable (Zv) band peaking at about —70 °C and a classical B band peaking at 35 °C. B band is ascribed to recombination in pairs S2/3QB", whereas the origin o f Zv bands remains unclear. M odified Zv bands, with flat shape and presenting a large part resistant to ethanol, were evidenced after som e minutes o f dark adaptation, both in light-exposed thylakoids and in thylakoids isolated from photoinhibited leaves. This ethanol resistant part in Zv band was only induced by p h oto­ inhibitory treatment performed under aerobic conditions (2 1 % 0 2 in media), both in vitro and in vivo; thus, the appearance o f the special Zv band would be related to an oxidative process accompanying photoinhibition. B bands presented reduced sizes and a shift o f peak maximum o f about 5 °C after some minutes o f dark adaptation. In vivo, the recovery o f a high PS II activ­ ity and o f B bands displaying normal characteristics occurs parallely to reappearance o f Zv bands with normal shape and with a vestigial ethanol resistant band. 
  Reference    Z. Naturforsch. 47c, 875—8 (1992); received July 27/A ugust 27 1992 
  Published    1992 
  Keywords    Pea, Photoinhibition, Photosystem II, Thermoluminescence, Thylakoid, Zv Band 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0875.pdf 
 Identifier    ZNC-1992-47c-0875 
 Volume    47