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

Autor:	Züst T; Institute of Plant Sciences, University of Bern, Bern, Switzerland., Strickler SR; Boyce Thompson Institute, Ithaca, United States., Powell AF; Boyce Thompson Institute, Ithaca, United States., Mabry ME; Division of Biological Sciences, University of Missouri, Columbia, United States., An H; Division of Biological Sciences, University of Missouri, Columbia, United States., Mirzaei M; Boyce Thompson Institute, Ithaca, United States., York T; Boyce Thompson Institute, Ithaca, United States., Holland CK; Boyce Thompson Institute, Ithaca, United States., Kumar P; Boyce Thompson Institute, Ithaca, United States., Erb M; Institute of Plant Sciences, University of Bern, Bern, Switzerland., Petschenka G; Institut für Insektenbiotechnologie, Justus-Liebig-Universität Giessen, Giessen, Germany., Gómez JM; Department of Functional and Evolutionary Ecology, Estación Experimental de Zonas Áridas (EEZA-CSIC), Almería, Spain., Perfectti F; Research Unit Modeling Nature, Department of Genetics, University of Granada, Granada, Spain., Müller C; Department of Chemical Ecology, Bielefeld University, Bielefeld, Germany., Pires JC; Division of Biological Sciences, University of Missouri, Columbia, United States., Mueller LA; Boyce Thompson Institute, Ithaca, United States., Jander G; Boyce Thompson Institute, Ithaca, United States.
Jazyk:	angličtina
Zdroj:	ELife [Elife] 2020 Apr 07; Vol. 9. Date of Electronic Publication: 2020 Apr 07.
DOI:	10.7554/eLife.51712
Abstrakt:	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. Competing Interests: TZ, SS, AP, MM, HA, MM, TY, CH, PK, ME, GP, JG, FP, CM, JP, LM, GJ No competing interests declared (© 2020, Züst et al.)
Databáze:	MEDLINE
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