Plant phenotypic and transcriptional changes induced by volatiles from the fungal root pathogen Rhizoctonia solani

Viviane Cordovez da Cunha, Liesje Mommer, Kay Moisan, Dani Lucas Gomes Marques Barbosa, Ronald Pierik, Roland Mumm, Victor J. Carrion, Jos M. Raaijmakers*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

32 Citations (Scopus)

Abstract

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 Rhizoctonia solani enhance growth and accelerate development of Arabidopsis thaliana. 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 Mamestra brassicae. Transcriptomics of A. thaliana 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 A. thaliana, suggesting that other yet unknown pathways play a more prominent role. We postulate that R. solani 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.

Original languageEnglish
Article number1262
JournalFrontiers in Plant Science
Volume8
DOIs
Publication statusPublished - 2017

Keywords

  • Auxin
  • Fungal volatiles
  • Plant growth promotion
  • Plant resistance
  • Plant transcriptome

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