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. 2016 Nov 4;132(1):13–66. doi: 10.1007/s11120-016-0318-y

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 10 — High-temperature stress effects. a The parameter V _K/V _J as a function of the parameter F _V/F _M used here as a measure for the severity of the treatment. Heat stress induces a significant increase in the value of the parameter V _K/V _J, whereas drought stress has no effect on this parameter. b. Demonstration of the critical temperature (T _C): gradually increasing the leaf temperature leads above a certain critical temperature to an increase of the F _O value. T _C is determined as indicated in b; it differs between photosynthetic samples and may be used as an indicator for adaptation or tolerance to heat (Živčák and Brestič, unpublished data)