Luann
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The origin of PUFA is the FAD2 and FAD6 oleate desaturases in the E.R. and chloroplasts of photosynthetic plants, rotifers, and algae. Plants store much of their polyunsaturated fat in their leaves and stem, though fruits also photosynthesize and do contain chloroplasts with polyunsaturated acids. Plastids of other kinds, like the amyloplasts in tubers, have PUFA but in smaller percents in the cell. It seems that FAD2 and -2 are most active in the areas of organisms that get energy from light.
http://ucce.ucdavis.edu/files/datastore/234-1766.pdf
http://plankt.oxfordjournals.org/content/21/7/1355.full.pdf
Trienoic fatty acids are required to maintain chloroplast function at low temperatures. - PubMed - NCBI
Polyunsaturated membranes are required for photosynthetic competence in a mutant of Arabidopsis. - PubMed - NCBI
http://ucce.ucdavis.edu/files/datastore/234-1766.pdf
http://plankt.oxfordjournals.org/content/21/7/1355.full.pdf
Trienoic fatty acids are required to maintain chloroplast function at low temperatures. - PubMed - NCBI
Polyunsaturated membranes are required for photosynthetic competence in a mutant of Arabidopsis. - PubMed - NCBI