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1999 (1)
1Author    Tibor Janda3, Gabriella Szalai3, Catherine Giauffretb, Emil Páldi3, Jean-M Arc DucruetcRequires cookie*
 Title    The Thermoluminescence 'Afterglow' Band as a Sensitive Indicator of Abiotic Stresses in Plants  
 Abstract    Single turn-over xenon flashes induce a thermoluminescence (TL) B-band centred near 35 °C. The far-red illumination of leaves at non-freezing temperatures induces a band peaking at around 45 °C (afterglow or AG-band), together with a downshifted B-band peaking be­ tween 15 °C and 28 °C. In control, unfrozen wheat plants, the Tmax of the B-band induced after 30 s far-red light at 0 °C was approx. 1 5 -1 8 °C. In maize plants grown under the same conditions, this far-red-induced downshift was not so strong, since the B-band peaked at 2 8 -30 °C. Both a decline in the AG-band and a reversal of the downshift of the B-band were observed after short-term freezing in several plant species. There was usually a sudden drop in the AG-band below a critical freezing temperature. However, while in wheat plants a weak TL emission could be seen between 4 0 -5 0 °C in frozen samples, in cold-sensitive maize plants this was completely suppressed and only the B-band could be detected. In cold-har­ dened wheat plants the temperature at which the AG-band was suppressed was lower than in non-hardened plants. Drought and short-term heat stress also affect the AG-band. As the AG-band was found to be more sensitive to several types of stresses than the B-band, it can be used as a sensitive stress indicator. However, the behaviour of the AG-band depends on several factors (for example the age of the leaf, etc.), which must be controlled if different species or varieties are to be compared. 
  Reference    Z. Naturforsch. 54c, 629 (1999); received O ctober 31 1998/January 25 1999 
  Published    1999 
  Keywords    Afterglow, Drought, Freezing, Heat Stress, Thermoluminescence 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0629.pdf 
 Identifier    ZNC-1999-54c-0629 
 Volume    54