Root volatiles in plant-plant interactions I: Characterization of root sesquiterpene emissions from Centaurea stoebe and their effects on other plants

Gfeller, Valentin; Huber, Meret; Foerster, Christiane; Huang, Wei; Koellner, Tobias G.; Erb, Matthias (13 October 2018). Root volatiles in plant-plant interactions I: Characterization of root sesquiterpene emissions from Centaurea stoebe and their effects on other plants (Unpublished) (bioRxiv 441717). Cold Spring Harbor Laboratory 10.1101/441717

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Volatile organic compounds (VOCs) emitted by plant leaves can influence the physiology of neighboring plants. In contrast to interactions above ground, little is known about the role of VOCs in belowground plant-plant interactions. Here, we characterize constitutive root volatile emissions of the spotted knapweed (Centaurea stoebe) and explore the impact of these volatiles on the germination and growth of different sympatric plant species. We show that C. stoebe roots emit high amounts of sesquiterpenes, with estimated release rates of (E)-beta-caryophyllene above 3 ug g-1 dw h-1. Sesquiterpene emissions show little variation between different C. stoebe populations, but vary substantially between different Centaurea species. Through root transcriptome sequencing, we identify six root-expressed sesquiterpene synthases (TPSs). Two root-specific TPSs, CsTPS4 and CsTPS5, are sufficient to produce the full blend of emitted root sesquiterpenes. Volatile exposure experiments demonstrate that C. stoebe root volatiles have neutral to positive effects on the germination and growth of different sympatric neighbors. Thus, constitutive root sesquiterpenes produced by two C. stoebe TPSs are associated with facilitation of sympatric neighboring plants. The release of root VOCs may thus influence C. stoebe abundance and plant community structure in nature.

Item Type:

Working Paper

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:

Gfeller, Valentin Johannes; Huang, Wei and Erb, Matthias

Subjects:

500 Science > 580 Plants (Botany)

Series:

bioRxiv

Publisher:

Cold Spring Harbor Laboratory

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

19 Nov 2018 09:08

Last Modified:

19 Nov 2018 09:14

Publisher DOI:

10.1101/441717

Additional Information:

unpublished preprint

BORIS DOI:

10.7892/boris.121141

URI:

https://boris.unibe.ch/id/eprint/121141

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