Regulation of energy partitioning and alternative electron transport pathways during cold acclimation of lodgepole pine is oxygen dependent

Plant & Cell Physiology
Leonid V SavitchNorman P A Huner

Abstract

Second year needles of Lodgepole pine (Pinus contorta L.) were exposed for 6 weeks to either simulated control summer ['summer'; 25 °C/250 photon flux denisty (PFD)], autumn ('autumn'; 15°C/250 PFD) or winter conditions ('winter'; 5 °C/250 PFD). We report that the proportion of linear electron transport utilized in carbon assimilation (ETR(CO2)) was 40% lower in both 'autumn' and 'winter' pine when compared with the 'summer' pine. In contrast, the proportion of excess photosynthetic linear electron transport (ETR(excess)) not used for carbon assimilation within the total ETR(Jf) increased by 30% in both 'autumn' and 'winter' pine. In 'autumn' pine acclimated to 15°C, the increased amounts of 'excess' electrons were directed equally to 21  kPa O2-dependent and 2  kPa O2-dependent alternative electron transport pathways and the fractions of excitation light energy utilized by PSII photochemistry (Φ(PSII)), thermally dissipated through Φ(NPQ) and dissipated by additional quenching mechanism(s) (Φ(f,D)) were similar to those in 'summer' pine. In contrast, in 'winter' needles acclimated to 5 °C, 60% of photosynthetically generated 'excess' electrons were utilized through the 2  kPa O2-dependent electron sink and only 15% by the phot...Continue Reading

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Citations

Jul 19, 2013·Photosynthesis Research·Marek ZivcakSuleyman I Allakhverdiev
Nov 26, 2011·Journal of Biosciences·Xin Sun, Tao Wen
Jun 10, 2014·Biochemistry. Biokhimii︠a︡·A Stirbet Govindjee
Aug 6, 2014·Biochimica Et Biophysica Acta·Kathleen FeilkeAnja Krieger-Liszkay
Jan 13, 2015·Annual Review of Plant Biology·Wojciech J NawrockiFrancis-André Wollman
Feb 8, 2018·Plant, Cell & Environment·Leonid V KurepinVaughan Hurry
Aug 16, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Kathleen FeilkeAnja Krieger-Liszkay
Sep 12, 2019·Journal of Bioenergetics and Biomembranes·Rachel Alves MaiaJosé Hélio Costa
Apr 22, 2020·Physiologia Plantarum·Maya VelitchkovaAlexander G Ivanov
Jan 17, 2021·The New Phytologist·Beatriz Fernández-MarínJosé Ignacio García-Plazaola
Aug 8, 2021·International Journal of Molecular Sciences·Aynura PashayevaIsmayil S Zulfugarov

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