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'Heat Stress' in keywords Facet   Publication Year 1999  [X]
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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 
2Author    Sándor Dulai3, István Molnár3, Evelin Pélia, Endre LehoczkiabRequires cookie*
 Title    Short-Term Responses of Photosystem II to Heat Stress in Cold-Acclimated Atrazine-Resistant and Susceptible Biotypes of Erigeron canadensis (L.)  
 Abstract    When leaves of atrazine-resistant (A R) and atrazine-sensitive (S) Erigeron canadensis (L.) plants grown at 5 °C were exposed to an elevated temperature (35 °C) for 30 min, the critical (T c) and peak temperatures (Tp) of the F0 vs. T curves were considerably higher for the leaves of the S biotype, but not for those of the A R biotype. The temperature dependences of F J F m and AFIFm' were not greatly different for the heat-treated cold-acclimated A R biotype, in contrast with the situation for the S plants. This short-term heat treatment resulted in a more significant shift in the optimal thermal interval of C 0 2 fixation for the S than for the A R biotypes. 
  Reference    Z. Naturforsch. 54c, 665 (1999); received November 2 1998/February 19 1999 
  Published    1999 
  Keywords    Erigeron canadensis, Heat Stress, Chlorophyll Fluorescence, Photosystem II, Photosynthesis 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0665.pdf 
 Identifier    ZNC-1999-54c-0665 
 Volume    54