Photosynthetica 2016, 54(4):611-619 | DOI: 10.1007/s11099-016-0644-5

Effects of long-term action of high temperature and high light on the activity and energy interaction of both photosystems in tomato plants

A. Faik1, A. V. Popova1, M. Velitchkova1,*
1 Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria

The acclimation to high light, elevated temperature, and combination of both factors was evaluated in tomato (Solanum lycopersicum cv. M82) by determination of photochemical activities of PSI and PSII and by analyzing 77 K fluorescence of isolated thylakoid membranes. Developed plants were exposed for six days to different combinations of temperature and light intensity followed by five days of a recovery period. Photochemical activities of both photosystems showed different sensitivity towards the heat treatment in dependence on light intensity. Elevated temperature exhibited more negative impact on PSII activity, while PSI was slightly stimulated. Analysis of 77 K fluorescence emission and excitation spectra showed alterations in the energy distribution between both photosystems indicating alterations in light-harvesting complexes. Light intensity affected the antenna complexes of both photosystems stronger than temperature. Our results demonstrated that simultaneous action of high-light intensity and high temperature promoted the acclimation of tomato plants regarding the activity of both photosystems in thylakoid membranes.

Keywords: antenna complexes; electron transport rate; fluorescence; pigment-protein complexes; spillover

Received: December 2, 2015; Accepted: May 27, 2016; Published: December 1, 2016Show citation

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Faik, A., Popova, A.V., & Velitchkova, M. (2016). Effects of long-term action of high temperature and high light on the activity and energy interaction of both photosystems in tomato plants. Photosynthetica, 54(4), 611-619. doi: 10.1007/s11099-016-0644-5.
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