| | 1 | Author
| Tibor Janda3, Gabriella Szalai3, Catherine Giauffretb, Emil Páldi3, Jean-M Arc Ducruetc | Requires 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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| default:Reihe_C/54/ZNC-1999-54c-0629.pdf | | | | Identifier
| ZNC-1999-54c-0629 | | | | Volume
| 54 | |
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