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Plant and Cell Physiology Advance Access published online on June 9, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci136
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received March 21, 2005
Accepted May 21, 2005

Regular Paper

Temperature and Light Modulate the trans-{Delta}3-Hexadecenoic Acid Content of Phosphatidylglycerol: Light-Harvesting Complex II Organization and Non-Photochemical Quenching

Gordon R. Gray 1*, Alexander G. Ivanov 2, Marianna Król 2, John P. Williams 3, Mobashoher U. Kahn 3, Elizabeth G. Myscich 2, and Norman P.A. Huner 2

1 Department of Plant Sciences, University of Saskatchewan, Saskatoon SK S7N 5A8, Canada
2 Department of Biology and The Biotron, University of Western Ontario, London ON N6A 5B7, Canada
3 Department of Botany, University of Toronto, Toronto ON M5S 1A1, Canada

* To whom correspondence should be addressed.
Gordon R. Gray, E-mail: gr.gray{at}usask.ca


  Abstract

The interaction of light and temperature in the modulation of the trans-{Delta}3-hexadecenoic acid (trans-16:1) content of phosphatidylglycerol (PG) in winter rye (Secale cereale L.) was assessed and related to the organization of light-harvesting complex II (LHCII). Increasing the growth irradiance from 50 to 800 µmol m-2 s-1 at 20°C resulted in a 1.8-fold increase in the trans-16:1 content in PG which favoured a greater preponderance of oligomeric LHCII, measured in vitro as the ratio of oligomer:monomer. Similar irradiance-dependent increases were observed during growth at 5°C, however, 1.4-fold lower trans-16:1 contents and lower LHCII oligomer:monomer ratios were observed compared to growth at 20°C and the same irradiance. These trends were also observed under natural field conditions. Thus, the accumulation of trans-16:1, as well as the organization of LHCII are modulated by both growth irradiance and growth temperature in an independent but additive manner. We also examined how changes in the supramolecular organization of LHCII affected the capacity for non-photochemical quenching (qN) and photoprotection via antenna quenching (qO). While qO was positively correlated with qN there was no correlation with either LHCII organization or xanthophyll cycle activity under the steady-state growth conditions examined.

Keywords: Antenna quenching; Light-harvesting complex II; Non-photochemical quenching; Phosphatidylglycerol; Supramolecular organization; trans-{Delta}3-hexadecenoic acid.
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