The effect of low temperatures on fatty acid composition of crops with different cold resistance |
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Authors: | S P Makarenko L V Dudareva A I Katyshev T A Konenkina A V Nazarova E G Rudikovskaya N A Sokolova V V Chernikova Yu M Konstantinov |
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Institution: | 1.Siberian Institute of Plant Physiology and Biochemistry,Russian Academy of Sciences,Irkutsk,Russia |
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Abstract: | The study was focused on fatty acid (FA) composition of lipids from the seedlings and roots of crops having different cold
resistance and grown at 27°C or 4°C. Biosynthesis of FA in the lipids of seedlings and roots of cold-susceptible maize (Zea mays L.) at both growth temperatures was controlled by chloroplast ω6 desaturase and microsomal ω6 desaturase, respectively. The
content of linoleic acid was 56.2% and 43.3% in the coleoptiles of maize seedlings grown at 4 and 27°C, respectively, and
in the roots it was 52.2% and 38.5%, respectively. The content of α-linolenoic acid in the coleoptiles was 6.7–6.8% at both
temperatures, while in the root lipids it was higher at low temperature (3.15% at 27°C vs. 4.7% at 4°C). FA biosynthesis in
the seedling coleoptiles of wheat (Triticum aestivum L.) and Siberian wild rye (Elymus sibiricus L.) grown at low temperature was controlled by the chloroplast ω3 desaturase. A minor increase in the content of α-linolenoic
acid was observed at low temperature: 29.7% to 30.2% in wheat and 22.8% to 25.8% in wild rye. In the root tissues of these
species, the biosynthesis of α-linolenoic acid was controlled by the microsomal ω3 desaturase. The content of α-linolenoic
acid was higher at low temperature: in wheat it was 6.1% at 27°C and 17.1%, and 4°C, while in Siberian wild rye, 7.1% and
12.0% at 4 and 27°C, respectively. |
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