A - Papers appearing in refereed journals
Menard, G. N., Martin-Moreno, J., Bryant, F. M., Munoz-Azcarate, O., Kelly, A. A., Hassani-Pak, K., Kurup, S. and Eastmond, P. J. 2017. Genome wide analysis of fatty acid desaturation and its response to temperature. Plant Physiology. 173 (3), pp. 1594-1605.
|Authors||Menard, G. N., Martin-Moreno, J., Bryant, F. M., Munoz-Azcarate, O., Kelly, A. A., Hassani-Pak, K., Kurup, S. and Eastmond, P. J.|
Plants modify the polyunsaturated fatty acid content of their membrane and storage lipids in order to adapt to changes in temperature. In developing seeds, this response is largely controlled by the activities of the microsomal ω-6 and ω-3 fatty acid desaturases, FAD2 and FAD3. Although temperature regulation of desaturation has been studied at the molecular and biochemical levels, the genetic control of this trait is poorly understood. Here, we have characterized the response of Arabidopsis (Arabidopsis thaliana) seed lipids to variation in ambient temperature and found that heat inhibits both ω-6 and ω-3 desaturation in phosphatidylcholine, leading to a proportional change in triacylglycerol composition. Analysis of the 19 parental accessions of the multiparent advanced generation intercross (MAGIC) population showed that significant natural variation exists in the temperature responsiveness of ω-6 desaturation. A combination of quantitative trait locus (QTL) analysis and genome-wide association studies (GWAS) using the MAGIC population suggests that ω-6 desaturation is largely controlled by cis-acting sequence variants in the FAD2 5′ untranslated region intron that determine the expression level of the gene. However, the temperature responsiveness of ω-6 desaturation is controlled by a separate QTL on chromosome 2. The identity of this locus is unknown, but genome-wide association studies identified potentially causal sequence variants within ∼40 genes in an ∼450-kb region of the QTL.
|Year of Publication||2017|
|Journal citation||173 (3), pp. 1594-1605|
|Digital Object Identifier (DOI)||doi:10.1104/pp.16.01907|
|Open access||Published as ‘gold’ (paid) open access|
|Funder||Biotechnology and Biological Sciences Research Council|
|Funder project or code||Designing Seeds for Nutrition and Health (DS)|
|Designing oilseeds for nutrition and health|
|Online||03 Mar 2017|
|Publication process dates|
|Accepted||20 Jan 2017|
|Publisher||American Society of Plant Biologists (ASPB)|
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