Temperature Effects on the Fatty Acid Composition of the Seed Oil of Wild Species of Flax1
- D. M. Yermanos,
- S. H. Patil and
- S. Hemstreet2
Linum angustifolium Huds. (2n=30), L. grandiflorum Desf (2n=16) and L. schiedeanum S. & C. (2n=36) were grown in growth chambers at constant 15.5 C night temperature and three day temperatures, 15.5, 21 to 26, and 32 C. Fatty acid composition of their seed oil was determined by gas liquid chromatography. At the 15.5 C treatment, L. angustifolium and L. grandiflorum had a significantly higher linolenic acid content (62.5% and 63.8%, respectively) and a lower oleic acid content (14.4% and 14.1%) than at the 32 C treatment (47.5%, 44.6%, 25.7% and 31.8%, respectively). L. angustifolium also had a significantly higher stearic acid content at the higher temperature (9.4 vs. 4.3%). By contrast in L. schiedeanum, the increase in oleic acid at 32 C (13.1% vs. 6.1% at 15.5 C) was associated with a significant decrease in linoleic acid at (73.1 vs 78.8% at 32 C) instead of a decrease in linolenic acid. Differential response to temperature effects indicates that different metabolic pathways control fatty acid synthesis in these species.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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