Plant Phenotypic and Transcriptional Changes Induced by Volatiles from the Fungal Root Pathogen Rhizoctonia solani

Beneficial soil microorganisms can affect plant growth and resistance by the production of volatile organic compounds (VOCs). Yet, little is known on how VOCs from soil-borne plant pathogens affect plant growth and resistance. Here we show that VOCs released from mycelium and sclerotia of the fungal...

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Published inFrontiers in plant science Vol. 8; p. 1262
Main Authors Cordovez, Viviane, Mommer, Liesje, Moisan, Kay, Lucas-Barbosa, Dani, Pierik, Ronald, Mumm, Roland, Carrion, Victor J, Raaijmakers, Jos M
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers Media S.A 21.07.2017
Subjects
Auxin
Fungal volatiles
Plant growth promotion
Plant resistance
Plant Science
Plant transcriptome
plant transcriptome
plant resistance
auxin
plant growth promotion
fungal volatiles
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Summary:Beneficial soil microorganisms can affect plant growth and resistance by the production of volatile organic compounds (VOCs). Yet, little is known on how VOCs from soil-borne plant pathogens affect plant growth and resistance. Here we show that VOCs released from mycelium and sclerotia of the fungal root pathogen enhance growth and accelerate development of . Seedlings briefly exposed to the fungal VOCs showed similar phenotypes, suggesting that enhanced biomass and accelerated development are primed already at early developmental stages. Fungal VOCs did not affect plant resistance to infection by the VOC-producing pathogen itself but reduced aboveground resistance to the herbivore . Transcriptomics of revealed that genes involved in auxin signaling were up-regulated, whereas ethylene and jasmonic acid signaling pathways were down-regulated by fungal VOCs. Mutants disrupted in these pathways showed similar VOC-mediated growth responses as the wild-type , suggesting that other yet unknown pathways play a more prominent role. We postulate that uses VOCs to predispose plants for infection from a distance by altering root architecture and enhancing root biomass. Alternatively, plants may use enhanced root growth upon fungal VOC perception to sacrifice part of the root biomass and accelerate development and reproduction to survive infection.
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This article was submitted to Plant Microbe Interactions, a section of the journal Frontiers in Plant Science
Reviewed by: Maria L. Pappas, Democritus University of Thrace, Greece; Kemal Kazan, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia
Edited by: Jens Staal, Ghent University, Belgium
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2017.01262