Cold acclimation of the Arabidopsis dgd1 mutant results in recovery from photosystem I-limited photosynthesis.
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.
Hendrickson
Luke
L
Umeå Plant Science Centre, Department of Plant Physiology, University of Umeå, Umeå S-901 87, Sweden.
Vlcková
Alexandra
A
Selstam
Eva
E
Huner
Norman
N
Oquist
Gunnar
G
Hurry
Vaughan
V
D000064:Acclimatization / Q000502:physiology*; D017360:Arabidopsis / Q000033:anatomy & histology / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D003080:Cold Temperature; D005700:Galactosyltransferases / Q000235:genetics / Q000378:metabolism*; D008055:Lipids / Q000737:chemistry; D010641:Phenotype; D010788:Photosynthesis / Q000502:physiology*; D045331:Photosystem I Protein Complex / Q000502:physiology*; D011897:Random Allocation; D020524:Thylakoids / Q000737:chemistry / Q000648:ultrastructure
D029681:Arabidopsis Proteins; D008055:Lipids; D045331:Photosystem I Protein Complex; C119967:DGD1 protein, Arabidopsis; D005700:Galactosyltransferases