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RESEARCH ARTICLE
Contents Vol 36(1)

Effects of low temperature stress on excitation energy partitioning and photoprotection in Zea mays

Leonid V. Savitch A D E , Alexander G. Ivanov B D , Loreta Gudynaite-Savitch B C , Norman P. A. Huner B and John Simmonds A
+ Author Affiliations
- Author Affiliations

A Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Centre (ECORC), Central Experimental Farm, 960 Carling Avenue, Ottawa, ON K1A 0C6, Canada.

B Department of Biology, University of Western Ontario, London, ON N6A 5B7, Canada.

C Present address: Iogen Corporation, 310 Hunt Club Road East, Ottawa, ON K1V 1C1, Canada.

D These authors contributed equally to the writing of this manuscript.

E Corresponding author. Email: savitchl@agr.gc.ca

Functional Plant Biology 36(1) 37-49 https://doi.org/10.1071/FP08093
Submitted: 21 March 2008  Accepted: 4 October 2008   Published: 7 January 2009

Abstract

Analysis of the partitioning of absorbed light energy within PSII into fractions utilised by PSII photochemistry (ΦPSII), thermally dissipated via ΔpH- and zeaxanthin-dependent energy quenching (ΦNPQ) and constitutive non-photochemical energy losses (Φf,D) was performed in control and cold-stressed maize (Zea mays L.) leaves. The estimated energy partitioning of absorbed light to various pathways indicated that the fraction of ΦPSII was twofold lower, whereas the proportion of thermally dissipated energy through ΦNPQ was only 30% higher, in cold-stressed plants compared with control plants. In contrast, Φf,D, the fraction of absorbed light energy dissipated by additional quenching mechanism(s), was twofold higher in cold-stressed leaves. Thermoluminescence measurements revealed that the changes in energy partitioning were accompanied by narrowing of the temperature gap (ΔTM) between S2/3QB− and S2QA− charge recombinations in cold-stressed leaves to 8°C compared with 14.4°C in control maize plants. These observations suggest an increased probability for an alternative non-radiative P680+QA− radical pair recombination pathway for energy dissipation within the reaction centre of PSII in cold-stressed maize plants. This additional quenching mechanism might play an important role in thermal energy dissipation and photoprotection when the capacity for the primary, photochemical (ΦPSII) and zeaxanthin-dependent non-photochemical quenching (ΦNPQ) pathways are thermodynamically restricted in maize leaves exposed to cold temperatures.

Additional keywords: cold stress, non-photochemical quenching, PSII photochemistry, thermoluminescence.


Acknowledgements

This work was supported by the OCPA/AAFC Matching Investment Initiative, the Canadian Crops Genomics Initiative and NSERC Canada.


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