Journal
PLANT CELL
Volume 29, Issue 11, Pages 2786-2800Publisher
OXFORD UNIV PRESS INC
DOI: 10.1105/tpc.17.00531
Keywords
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Funding
- Multidisciplinary Research Partnership Bioinformatics: from nucleotides to networks Project of Ghent University [01MR0310W]
- European Union Seventh Framework Programme under European Research Council Advanced Grant [322739-DOUBLE-UP]
- Research Foundation-Flanders (FWO) [G008812N]
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Gene and genome duplications have been rampant during the evolution of flowering plants. Unlike small-scale gene duplications, whole-genome duplications (WGDs) copy entire pathways or networks, and as such create the unique situation in which such duplicated pathways or networks could evolve novel functionality through the coordinated sub-or neofunctionalization of its constituent genes. Here, we describe a remarkable case of coordinated gene expression divergence following WGDs in Arabidopsis thaliana. We identified a set of 92 homoeologous gene pairs that all show a similar pattern of tissue-specific gene expression divergence following WGD, with one homoeolog showing predominant expression in aerial tissues and the other homoeolog showing biased expression in tip-growth tissues. We provide evidence that this pattern of gene expression divergence seems to involve genes with a role in cell polarity and that likely function in the maintenance of cell wall integrity. Following WGD, many of these duplicated genes evolved separate functions through subfunctionalization in growth/development and stress response. Uncoupling these processes through genome duplications likely provided important adaptations with respect to growth and morphogenesis and defense against biotic and abiotic stress.
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