The effect of fatty acids (FAs) (C12–C24) on the functioning of winter wheat (Triticum aestivum L.) mitochondria was studied. Such fatty acids as C12:0, C16:0, and C18:0 and unsaturated FAs, such as C18:1 (n-9 cis), C18:1 (n-12 cis), C18:2 (n-9, 12), (18:3, n-3), and C22:1 (n-9 cis) caused efficient uncoupling of oxidative phosphorylation in mitochondria, i.e., an increase in the nonphosphorylating respiration rate and a decrease in the respiratory control value. It was established that C16:0 had the strongest uncoupling effect among all saturated FAs, and C18:3, among unsaturated FAs. The uncoupling effect of saturated FAs is provided by the ADP/ATP-antiporter, while plant uncoupling proteins play an important role in the uncoupling effect of unsaturated FAs. In addition, unsaturated, as well as saturated FAs might serve as oxidative substrates for mitochondria. It was concluded that the role of FAs in energetic metabolism of winter wheat seedlings consisted of uncoupling of oxidative phosphorylation and of serving as substrates for oxidation.
Russian Journal of Plant Physiology – Springer Journals
Published: May 10, 2009
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