Cold acclimation of the Arabidopsis dgd1 mutant results in recovery from photosystem I-limited photosynthesis
Hendrickson, Luke; Vlčková, Alexandra; Selstam, Eva; Huner, Norman; Öquist, Gunnar; Hurry, Vaughan
We compared the thylakoid membrane composition and photosynthetic properties of non- and cold-acclimated leaves from the dgd1 mutant (lacking > 90% of digalactosyl-diacylglycerol; DGDG) and wild type (WT) Arabidopsis thaliana. In contrast to warm grown plants, cold-acclimated dgd1 leaves recovered pigment-protein pools and photosynthetic function equivalent to WT. Surprisingly, this recovery was not correlated with an increase in DGDG. When returned to warm temperatures the severe dgd1 mutant phenotype reappeared. We conclude that the relative recovery of photosynthetic activity at 5 degrees C resulted from a temperature/lipid interaction enabling the stable assembly of PSI complexes in the thylakoid. (c) 2006 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
cold acclimation; digalactosyl-diacylglycerol; lipid; monogalactosyl-diacylglycerol; phosphatidylglycerol; P700; photosynthesis; photosystem I; photosystem II
2006, Volume: 580, number: 20, pages: 4959-4968
Publisher: ELSEVIER SCIENCE BV
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