Volatile compounds emitted by diverse verticillium species enhance plant growth by manipulating auxin signaling

Ningxiao Li, Wenzhao Wang, Vasileios Bitas, Krishna Subbarao, Xingzhong Liu, Seogchan Kang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Some volatile compounds (VC) play critical roles in intra- and interspecies interactions. To investigate roles of VC in fungal ecology, we characterized how VC produced by Verticillium spp., a group of broad-host-range soilborne fungal pathogens, affect plant growth and development. VC produced by 19 strains corresponding to 10 species significantly enhanced the growth of Arabidopsis thaliana and Nicotiana benthamiana. Analysis of VC produced by four species revealed the presence of diverse compounds, including those previously shown to affect plant growth. Using A. thaliana, we investigated the mechanism underpinning plant growth enhancement by Verticillium dahliae VC. Allometric analysis indicated that VC caused preferential resource allocation for root growth over shoot growth. Growth responses of A. thaliana mutants defective in auxin or ethylene signaling suggested the involvement of several components of auxin signaling, with TIR3 playing a key role. AUX1, TIR1, and AXR1 were also implicated but appeared to play lesser roles. Inhibition of auxin efflux using 1-naphthylphthalamic acid blocked VC-mediated growth enhancement. Spatial and temporal expression patterns of the auxin-responsive reporter DR5::GUS indicated that the activation of auxin signaling occurred before enhanced plant growth became visible. Results from this study suggest critical yet overlooked roles of VC in Verticillium ecology and pathology.

Original languageEnglish (US)
Pages (from-to)1021-1031
Number of pages11
JournalMolecular Plant-Microbe Interactions
Volume31
Issue number10
DOIs
StatePublished - Oct 1 2018

Fingerprint

Verticillium
Indoleacetic Acids
volatile compounds
auxins
plant growth
Growth
Arabidopsis
Arabidopsis thaliana
Ecology
naphthylphthalamic acid
Plant Development
Resource Allocation
ecology
Host Specificity
Verticillium dahliae
Nicotiana benthamiana
Growth and Development
resource allocation
Tobacco
plant pathogens

All Science Journal Classification (ASJC) codes

  • Physiology
  • Agronomy and Crop Science

Cite this

Li, Ningxiao ; Wang, Wenzhao ; Bitas, Vasileios ; Subbarao, Krishna ; Liu, Xingzhong ; Kang, Seogchan. / Volatile compounds emitted by diverse verticillium species enhance plant growth by manipulating auxin signaling. In: Molecular Plant-Microbe Interactions. 2018 ; Vol. 31, No. 10. pp. 1021-1031.
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abstract = "Some volatile compounds (VC) play critical roles in intra- and interspecies interactions. To investigate roles of VC in fungal ecology, we characterized how VC produced by Verticillium spp., a group of broad-host-range soilborne fungal pathogens, affect plant growth and development. VC produced by 19 strains corresponding to 10 species significantly enhanced the growth of Arabidopsis thaliana and Nicotiana benthamiana. Analysis of VC produced by four species revealed the presence of diverse compounds, including those previously shown to affect plant growth. Using A. thaliana, we investigated the mechanism underpinning plant growth enhancement by Verticillium dahliae VC. Allometric analysis indicated that VC caused preferential resource allocation for root growth over shoot growth. Growth responses of A. thaliana mutants defective in auxin or ethylene signaling suggested the involvement of several components of auxin signaling, with TIR3 playing a key role. AUX1, TIR1, and AXR1 were also implicated but appeared to play lesser roles. Inhibition of auxin efflux using 1-naphthylphthalamic acid blocked VC-mediated growth enhancement. Spatial and temporal expression patterns of the auxin-responsive reporter DR5::GUS indicated that the activation of auxin signaling occurred before enhanced plant growth became visible. Results from this study suggest critical yet overlooked roles of VC in Verticillium ecology and pathology.",
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Volatile compounds emitted by diverse verticillium species enhance plant growth by manipulating auxin signaling. / Li, Ningxiao; Wang, Wenzhao; Bitas, Vasileios; Subbarao, Krishna; Liu, Xingzhong; Kang, Seogchan.

In: Molecular Plant-Microbe Interactions, Vol. 31, No. 10, 01.10.2018, p. 1021-1031.

Research output: Contribution to journalArticle

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