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Updated: May 31, 2026

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Clone history shapes Populus drought responses.

Sherosha Raj¹, Katharina Bräutigam, Erin T Hamanishi

¹Department of Cell & Systems Biology, University of Toronto, Toronto, ON, Canada.

Proceedings of the National Academy of Sciences of the United States of America

|July 13, 2011

Summary

Genetically identical Populus trees show different drought responses based on their geographic origin. Environmental history influences gene expression and DNA methylation, impacting tree adaptation and evolution.

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Published on: April 17, 2015

Area of Science:

Plant biology
Genetics
Ecology

Background:

Clonally propagated Populus trees, similar to animal monozygotic twins, can experience different environments.
This allows for studying the impact of environmental history on responses to stimuli like drought.

Purpose of the Study:

To investigate if drought responses in Populus trees are influenced by their environmental history.
To compare transcriptome-level drought responses of three hybrid genotypes from different locations.

Main Methods:

Comparison of drought responses in three Populus hybrid genotypes (DN34, Walker, Okanese) from two distinct geographic origins.
Analysis of transcriptome-level gene expression patterns.
Assessment of genome-wide DNA methylation differences.

Main Results:

Drought response transcript abundance patterns varied based on the geographic origin of clones for two of the three genotypes.
These differences were more pronounced in genotypes with longer establishment times.
Genome-wide DNA methylation patterns mirrored transcriptome divergence, suggesting an epigenomic basis.

Conclusions:

Environmental history significantly impacts current drought responses in Populus trees.
Epigenetic modifications, specifically DNA methylation, may underlie clone history-dependent transcriptome divergence.
Findings have implications for Populus tree industrial applications, evolution, and persistence.