Abstract
AbstractLinum 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.
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