Photosynthetica 2013, 51(4):630-640 | DOI: 10.1007/s11099-013-0063-9

Effect of high temperature on dehydration-induced alterations in photosynthetic characteristics of the resurrection plant Haberlea rhodopensis

M. Velitchkova1, V. Doltchinkova2, D. Lazarova3, G. Mihailova4, S. Doncheva4, K. Georgieva4,*
1 Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
2 Faculty of Biology, Sofia University "St. K. Ohridski", Sofia, Bulgaria
3 Faculty of Medicine, Sofia University "St. K. Ohridski", Sofia, Bulgaria
4 Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria

The effect of high temperature (HT) and dehydration on the activity of photosynthetic apparatus and its ability to restore membrane properties, oxygen evolution, and energy distribution upon rehydration were investigated in a resurrection plant, Haberlea rhodopensis. Plants growing under low irradiance in their natural habitat were desiccated to air-dry state at a similar light intensity [about 30 μol(photon) m-2 s-1] under optimal day/night (23/20°C) or high (38/30°C) temperature. Our results showed that HT alone reduced the photosynthetic activity and desiccation of plants at 38°C and it had more detrimental effect compared with desiccation at 23°C. The study on isolated thylakoids demonstrated increased distribution of excitation energy to PSI as a result of the HT treatment, which was enhanced upon the desiccation. It could be related to partial destacking of thylakoid membranes, which was confirmed by electron microscopy data. In addition, the surface charge density of thylakoid membranes isolated from plants desiccated at 38°C was higher in comparison with those at 23°C, which was in agreement with the decreased membrane stacking. Dehydration led to a decrease of amplitudes of oxygen yields and to a loss of the oscillation pattern. Following rehydration, the recovery of CO2 assimilation and fluorescence properties were better when desiccation was performed at optimal temperature compared to high temperature. Rehydration resulted in partial recovery of the amplitudes of flash oxygen yields as well as of population of S0 state in plants desiccated at 23°C. However, it was not observed in plants dehydrated at 38°C.

Keywords: desiccation; photosynthesis; thylakoid membranes.

Received: October 30, 2012; Accepted: April 16, 2013; Published: December 1, 2013Show citation

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Velitchkova, M., Doltchinkova, V., Lazarova, D., Mihailova, G., Doncheva, S., & Georgieva, K. (2013). Effect of high temperature on dehydration-induced alterations in photosynthetic characteristics of the resurrection plant Haberlea rhodopensis. Photosynthetica, 51(4), 630-640. doi: 10.1007/s11099-013-0063-9.
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