Root volatiles in plant-plant interactions I: High root sesquiterpene release is associated with increased germination and growth of plant neighbors

Gfeller, Valentin Johannes; Huber, Meret; Förster, Christiane; Huang, Wei; Köllner, Tobias G.; Erb, Matthias (2019). Root volatiles in plant-plant interactions I: High root sesquiterpene release is associated with increased germination and growth of plant neighbors. Plant, Cell & Environment, 42(6), pp. 1950-1963. Blackwell Science 10.1111/pce.13532

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Volatile organic compounds (VOCs) emitted by plant leaves can influence the physiology of neighboring plants. In contrast to leaf VOCs, little is known about the role of root VOCs in plant‐plant interactions. Here, we characterize constitutive root VOC emissions of the spotted knapweed (Centaurea stoebe) and explore the impact of these VOCs 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)‐β‐caryophyllene above 3 μg 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. VOC‐exposure experiments demonstrate that C. stoebe root VOCs 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 plant community structure in nature.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

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

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0140-7791

Publisher:

Blackwell Science

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

12 Apr 2019 17:03

Last Modified:

23 Oct 2019 12:13

Publisher DOI:

10.1111/pce.13532

PubMed ID:

30737807

Uncontrolled Keywords:

Root volatiles, sesquiterpene synthase, associational effects, neighborhood effects, Plant-plant interactions

BORIS DOI:

10.7892/boris.126774

URI:

https://boris.unibe.ch/id/eprint/126774

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