Thermoluminescence Study of Photosystem II Activity in Haberlea rhodopensis and Spinach Leaves During Desiccation

Abstract Thermoluminescence glow curve parameters were used to access the functional features of PS II in the Balkan endemic HABERLEA RHODOPENSIS. This representative of the higher desiccation-tolerant plants is unique for the European flora. An unusual high temperature of TL emission from HABERLEA...

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Bibliographic Details
Published in:Plant biology (Stuttgart, Germany) Germany), 2004-05, Vol.6 (3), p.319-324
Main Authors: Peeva, V., Maslenkova, L.
Format: Article
Language:English
Subjects:
Acclimatization - drug effects
Acclimatization - physiology
Desiccation tolerance
Diuron - pharmacology
Europe
Haberlea rhodopensis
Light
Magnoliopsida - drug effects
Magnoliopsida - metabolism
Magnoliopsida - radiation effects
Original Paper
Photosystem II Protein Complex - drug effects
Photosystem II Protein Complex - physiology
Photosystem II Protein Complex - radiation effects
Plant Leaves - drug effects
Plant Leaves - metabolism
Plant Leaves - radiation effects
PS II
resurrection plants
Spinacia oleracea - drug effects
Spinacia oleracea - metabolism
Spinacia oleracea - radiation effects
Temperature
thermoluminescence
Water - metabolism
Water - pharmacology
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Summary:Abstract Thermoluminescence glow curve parameters were used to access the functional features of PS II in the Balkan endemic HABERLEA RHODOPENSIS. This representative of the higher desiccation-tolerant plants is unique for the European flora. An unusual high temperature of TL emission from HABERLEA leaves after excitation by one flash at 5 °C was observed. The position of the main TL B band (S 2 Q B - ) was at 45 - 47 °C, while this temperature was 30 - 32 °C in drought-sensitive mesophytic spinach. Consistent with the up-shift in TL emission, the lifetime of the S 2 state was also increased, showing a stabilization of charge storage in PS II complex in this resurrection plant. In addition, a part of PS II centres was less susceptible to DCMU. We consider the observed unusual TL characteristics of HABERLEA RHODOPENSIS reflect some structural modifications in PS II (especially in D1 protein), which could be related to the desiccation tolerance of this plant. This suggestion was supported by the different manner in which dehydration affected the TL properties in desiccation-tolerant HABERLEA and desiccation-sensitive spinach plants.
ISSN:1435-8603
1438-8677
DOI:10.1055/s-2004-820873