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Journal Article

Evidence of an evolutionary hourglass pattern in herbivory-induced transcriptomic responses

MPS-Authors
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Durrant,  Matthew
Department of Molecular Ecology, Prof. I. T. Baldwin, MPI for Chemical Ecology, Max Planck Society;

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Boyer,  Justin
Department of Molecular Ecology, Prof. I. T. Baldwin, MPI for Chemical Ecology, Max Planck Society;

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Zhou,  Wenwu
Department of Molecular Ecology, Prof. I. T. Baldwin, MPI for Chemical Ecology, Max Planck Society;

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Baldwin,  Ian Thomas
Department of Molecular Ecology, Prof. I. T. Baldwin, MPI for Chemical Ecology, Max Planck Society;

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Xu,  Shuqing
Department of Molecular Ecology, Prof. I. T. Baldwin, MPI for Chemical Ecology, Max Planck Society;

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Citation

Durrant, M., Boyer, J., Zhou, W., Baldwin, I. T., & Xu, S. (2017). Evidence of an evolutionary hourglass pattern in herbivory-induced transcriptomic responses. New Phytologist, 215(3), 1264-1273. doi:10.1111/nph.14644.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-733E-4
Abstract
Herbivory-induced defenses are specific and activated in plants when elicitors, frequently
found in the herbivores’ oral secretions, are introduced into wounds during attack. While
complex signaling cascades are known to be involved, it remains largely unclear how natural
selection has shaped the evolution of these induced defenses.
We analyzed herbivory-induced transcriptomic responses in wild tobacco, Nicotiana
attenuata, using a phylotranscriptomic approach that measures the origin and sequence
divergence of herbivory-induced genes.
Highly conserved and evolutionarily ancient genes of primary metabolism were activated at
intermediate time points (2–6 h) after elicitation, while less constrained and young genes associated
with defense signaling and biosynthesis of specialized metabolites were activated at
early (before 2 h) and late (after 6 h) stages of the induced response, respectively – a pattern
resembling the evolutionary hourglass pattern observed during embryogenesis in animals and
the developmental process in plants and fungi.
The hourglass patterns found in herbivory-induced defense responses and developmental
process are both likely to be a result of signaling modularization and differential evolutionary
constraints on the modules involved in the signaling cascade.