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Early and delayed long-term transcriptional changes and short-term transient responses during cold acclimation in olive leaves

AuthorsLeyva Pérez, M. de la O ; Valverde-Corredor, Antonio ; Valderrama, Raquel; Jiménez Ruiz, Jaime; Muñoz Mérida, Antonio; Trelles, Oswaldo; Bautista Barroso, Juan; Mercado-Blanco, Jesús ; Luque, Francisco
KeywordsOlea europaea
Issue Date1-Feb-2015
PublisherOxford University Press
CitationDNA Research 22(1): 1-11 (2015)
AbstractLow temperature severely affects plant growth and development. To overcome this constraint, several plant species from regions having a cool season have evolved an adaptive response, called cold acclimation. We have studied this response in olive tree (Olea europaea L.) cv. Picual. Biochemical stress markers and cold-stress symptoms were detected after the first 24 h as sagging leaves. After 5 days, the plants were found to have completely recovered. Control and cold-stressed plants were sequenced by Illumina HiSeq 1000 paired-end technique. We also assembled a new olive transcriptome comprising 157,799 unigenes and found 6,309 unigenes differentially expressed in response to cold. Three types of response that led to cold acclimation were found: short-term transient response, early long-term response, and late long-term response. These subsets of unigenes were related to different biological processes. Early responses involved many cold-stress-responsive genes coding for, among many other things, C-repeat binding factor transcription factors, fatty acid desaturases, wax synthesis, and oligosaccharide metabolism. After long-term exposure to cold, a large proportion of gene down-regulation was found, including photosynthesis and plant growth genes. Up-regulated genes after long-term cold exposure were related to organelle fusion, nucleus organization, and DNA integration, including retrotransposons.
Publisher version (URL)http://doi.org/10.1093/dnares/dsu033
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