Global monitoring of autumn gene expression within and among phenotypically divergent populations of Sitka spruce (Picea sitchensis).

The New Phytologist
Jason A HollidaySally N Aitken

Abstract

Cold acclimation in conifers is a complex process, the timing and extent of which reflects local adaptation and varies widely along latitudinal gradients for many temperate and boreal tree species. Despite their ecological and economic importance, little is known about the global changes in gene expression that accompany autumn cold acclimation in conifers. Using three populations of Sitka spruce (Picea sitchensis) spanning the species range, and a Picea cDNA microarray with 21,840 unique elements, within- and among-population gene expression was monitored during the autumn. Microarray data were validated for selected genes using real-time PCR. Similar numbers of genes were significantly twofold upregulated (1257) and downregulated (967) between late summer and early winter. Among those upregulated were dehydrins, pathogenesis-related/antifreeze genes, carbohydrate and lipid metabolism genes, and genes involved in signal transduction and transcriptional regulation. Among-population microarray hybridizations at early and late autumn time points revealed substantial variation in the autumn transcriptome, some of which may reflect local adaptation. These results demonstrate the complexity of cold acclimation in conifers, highlight...Continue Reading

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Citations

Apr 19, 2011·Functional & Integrative Genomics·Annie Archambault, Martina V Strömvik
Sep 11, 2012·Plant Molecular Biology·John MackayMaría-Teresa Cervera
Nov 25, 2011·Proceedings. Biological Sciences·Jason A HollidaySally N Aitken
Jul 25, 2015·The New Phytologist·Julien PrunierJohn J MacKay
Feb 1, 2008·Evolutionary Applications·Sally N AitkenSierra Curtis-McLane
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Sep 13, 2012·Molecular Ecology·Jill A HamiltonSally N Aitken
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Mar 4, 2017·International Journal of Molecular Sciences·Guixiang WangHan Xiao

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