Engineering cyclopropane fatty acid accumulation in plants
Heterologous expression of E. coli cyclopropane synthase in genotypic and phenotypic fad2fae1 plants facilitates accumulation of cyclopropane fatty acids. Co-expression of Sterculia foetida transferases, including lysophosphatidic acid acyltransferase, diacylglycerol acyltransferase (DGAT), and Phospholipid Diacyl Glycerol Acyltransferase (PDAT), with E. coli cyclopropane synthase further enhances cyclopropane fatty acid accumulation in fad2fae1 plant seeds.
1. A transgenic plant comprising higher levels of oleic acid than a wild type plant wherein said transgenic plant is a fad2fae1 plant that expresses Escherichia coli cyclopropane synthase and Sterculia foetida diacylglycerol acyltransferase (DGAT) and accumulates elevated amounts of cyclopropane fatty acids, wherein the transgenic plant is an oilseed crop plant selected from the group consisting of soybean, safflower, sunflower, canola, palm, Brassica , Cranbe and Camelina.
2. The transgenic plant of claim 1 that accumulates cyclopropane fatty acids in its seed.
3. The seed of the transgenic plant of claim 1 wherein the cyclopropane fatty acids comprise between about five percent (5%) and about sixty percent (60%) of the total seed fatty acid.
4. The seed of the transgenic plant of claim 1 wherein the cyclopropane fatty acids comprise between about ten percent (10%) and about forty percent (40%) of the total seed fatty acid.
5. A method producing cyclopropane fatty acids in an oilseed crop plant, the method comprising transforming fad2fae1 plant having higher levels of oleic acid than a wild type plant with a construct comprising a nucleic acid sequence encoding an Escherichia coli cyclopropane synthase and a nucleic acid sequence encoding a Sterculia foetida diacylglycerol acyltransferase (DGAT), wherein the oilseed crop plant accumulates elevated amounts of cyclopropane fatty acids, wherein the transgenic plant is an oilseed crop plant selected from the group consisting of soybean, safflower, sunflower, canola, palm, Brassica , Cranbe and Camelina.
6. The method of claim 5 , wherein the transgenic plant accumulates cyclopropane fatty acids in its seed.
7. The method of claim 5 , wherein the cyclopropane fatty acids comprise between about five percent (5%) and about sixty percent (60%) of the total seed fatty acid.
8. The method of claim 5 wherein the cyclopropane fatty acids comprise between about ten percent (10%) and about forty percent (40%) of the total seed fatty acid.