Independent evolution of ancestral and novel defenses in a genus of toxic plants (Erysimum, Brassicaceae)

Züst, Tobias; Strickler, Susan R.; Powell, Adrian F.; Mabry, Makenzie E.; An, Hong; Mirzaei, Mahdieh; York, Thomas; Holland, Cynthia K.; Kumar, Pavan; Erb, Matthias; Petschenka, Georg; Gomez, Jose-Maria; Perfectti, Francisco; Mueller, Caroline; Pires, J. Chris; Mueller, Lukas A.; Jander, Georg (2020). Independent evolution of ancestral and novel defenses in a genus of toxic plants (Erysimum, Brassicaceae). eLife, 9 eLife Sciences Publications 10.7554/eLife.51712

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Phytochemical diversity is thought to result from coevolutionary cycles as specialization in herbivores imposes diversifying selection on plant chemical defenses. Plants in the speciose genus Erysimum (Brassicaceae) produce both ancestral glucosinolates and evolutionarily novel cardenolides as defenses. Here we test macroevolutionary hypotheses on co-expression, co-regulation, and diversification of these potentially redundant defenses across this genus. We sequenced and assembled the genome of E. cheiranthoides and foliar transcriptomes of 47 additional Erysimum species to construct a phylogeny from 9868 orthologous genes, revealing several geographic clades but also high levels of gene discordance. Concentrations, inducibility, and diversity of the two defenses varied independently among species, with no evidence for trade-offs. Closely related, geographically co-occurring species shared similar cardenolide traits, but not glucosinolate traits, likely as a result of specific selective pressures acting on each defense. Ancestral and novel chemical defenses in Erysimum thus appear to provide complementary rather than redundant functions.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Biotic Interactions
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Züst, Tobias and Erb, Matthias

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

2050-084X

Publisher:

eLife Sciences Publications

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

26 May 2020 14:21

Last Modified:

26 May 2020 14:21

Publisher DOI:

10.7554/eLife.51712

BORIS DOI:

10.7892/boris.144063

URI:

https://boris.unibe.ch/id/eprint/144063

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