A Simple Alternative Approach to Assessing the Fate of Absorbed Light Energy Using Chlorophyll Fluorescence |
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Authors: | Hendrickson Luke Furbank Robert T Chow Wah Soon |
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Institution: | Research School of Biological Sciences, Australian National University, G.P.O. Box 475, Canberra ACT, 2601, Australia, chow@rsbs.anu.edu.au. |
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Abstract: | We propose a simplified alternative method for quantifying the partitioning of excitation energy between photochemistry, fluorescence and thermal dissipation. This alternative technique uses existing well-defined quantum efficiencies such as Phi(PS II), leaving no 'excess' efficiency unaccounted for, effectively separates regulated and constitutive thermal dissipation processes, does not require the use of F(o) and F'(o) measurements and gives very similar results to the method proposed by Kramer et al. (2004) Photosynth Res 79: 209-218]. We demonstrate the use of the technique using chlorophyll fluorescence measurements in grapevine leaves and observe a high dependence on thermal dissipation processes (up to 75%) at both high light and low temperature. |
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Keywords: | excitation energy flux analysis leaf chlorophyll fluorescence non-photochemical quenching thermal dissipation Vitis vinifera xanthophyll |
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