Evolution of gene networks underlying adaptation to drought stress in the wild tomato Solanum chilense.

Autor: Wei K; Department of Life Science Systems, School of Life Sciences, Technical University of Munich, Freising, Germany., Sharifova S; Department of Life Sciences, Graduate School of Science, Arts and Technology, Khazar University, Baku, Azerbaijan., Zhao X; Department of Life Science Systems, School of Life Sciences, Technical University of Munich, Freising, Germany., Sinha N; Department of Plant Biology, University of California Davis, Davis, California, USA., Nakayama H; Department of Biological Sciences, The University of Tokyo, Tokyo, Japan., Tellier A; Department of Life Science Systems, School of Life Sciences, Technical University of Munich, Freising, Germany., Silva-Arias GA; Department of Life Science Systems, School of Life Sciences, Technical University of Munich, Freising, Germany.; Instituto de Ciencias Naturales, Facultad de Ciencias, Universidad Nacional de Colombia, Bogotá, Colombia.
Jazyk: angličtina
Zdroj: Molecular ecology [Mol Ecol] 2024 Nov; Vol. 33 (21), pp. e17536. Date of Electronic Publication: 2024 Oct 03.
DOI: 10.1111/mec.17536
Abstrakt: Drought stress is a key limitation for plant growth and colonization of arid habitats. We study the evolution of gene expression response to drought stress in a wild tomato, Solanum chilense, naturally occurring in dry habitats in South America. We conduct a transcriptome analysis under standard and drought experimental conditions to identify drought-responsive gene networks and estimate the age of the involved genes. We identify two main regulatory networks corresponding to two typical drought-responsive strategies: cell cycle and fundamental metabolic processes. The metabolic network exhibits a more recent evolutionary origin and a more variable transcriptome response than the cell cycle network (with ancestral origin and higher conservation of the transcriptional response). We also integrate population genomics analyses to reveal positive selection signals acting at the genes of both networks, revealing that genes exhibiting selective sweeps of older age also exhibit greater connectivity in the networks. These findings suggest that adaptive changes first occur at core genes of drought response networks, driving significant network re-wiring, which likely underpins species divergence and further spread into drier habitats. Combining transcriptomics and population genomics approaches, we decipher the timing of gene network evolution for drought stress response in arid habitats.
(© 2024 The Author(s). Molecular Ecology published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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