biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 64:167-177, 2020 | DOI: 10.32615/bp.2019.144

Altered fatty acid composition of Nicotiana benthamiana and Nicotiana excelsior leaves under transient overexpression of the cyanobacterial desC gene

M. BERESTOVOY*, O.S. PAVLENKO, A.A. TYURIN, E.N. GORSHKOVA, I.V. GOLDENKOVA-PAVLOVA
Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow 127276, Russia

Transient heterologous gene expression in two model plant species, Nicotiana benthamiana and N. excelsior, has been used to study the localization of the heterologous Δ9 acyl-lipid desaturase (Δ9 desaturase) of Synechococcus vulcanus in different cell compartments and its functional activity in the cases of the cytosol, chloroplast, and endoplasmic reticulum (ER) localization. The functional activity and substrate specificity of the heterologous desaturase under the conditions of transient expression have been confirmed by comparison of fatty acid (FA) profiles. The Δ9 desaturase, responsible for the synthesis of oleic and palmitoleic acids, has also been shown to strongly promote the accumulation of polyunsaturated FAs. The results convincingly demonstrate that the Δ9 desaturase of the thermophilic cyanobacterium transiently expressed in two Nicotiana species considerably alters lipid metabolism in their leaves towards a higher FA unsaturation. The functional activity of Δ9 desaturase depends on both the model plant species, N. benthamiana or N. excelsior, and the cellular localization of the enzyme. The method of transient expression of heterologous genes in plants is highly effective, inexpensive, and not time-consuming, which makes it attractive for estimating the functional activity and/or substrate specificity of heterologous desaturases.

Keywords: cellular compartments, Δ9 desaturase, oleic and palmitoleic acids, signal sequences.

Received: August 2, 2019; Revised: October 20, 2019; Accepted: November 21, 2019; Prepublished online: March 5, 2020; Published online: February 28, 2020  Show citation

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BERESTOVOY, M., PAVLENKO, O.S., TYURIN, A.A., GORSHKOVA, E.N., & GOLDENKOVA-PAVLOVA, I.V. (2020). Altered fatty acid composition of Nicotiana benthamiana and Nicotiana excelsior leaves under transient overexpression of the cyanobacterial desC gene. Biologia plantarum, 64, Article 167-177. https://doi.org/10.32615/bp.2019.144
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