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Priming of Plant Growth Promotion by Volatiles of Root-Associated Microbacterium spp.
Cordovez, Viviane; Schop, Sharella; Hordijk, Kees; Dupré de Boulois, Hervé; Coppens, Filip; Hanssen, Inge; Raaijmakers, Jos M; Carrión, Víctor J.
Afiliación
  • Cordovez V; Department of Microbial Ecology, Netherlands Institute of Ecology, Wageningen, The Netherlands.
  • Schop S; Department of Microbial Ecology, Netherlands Institute of Ecology, Wageningen, The Netherlands.
  • Hordijk K; Department of Microbial Ecology, Netherlands Institute of Ecology, Wageningen, The Netherlands.
  • Dupré de Boulois H; Scientia Terrae Research Institute, Sint-Katelijne-Waver, Belgium.
  • Coppens F; R&D Department, DCM nv, Grobbendonk, Belgium.
  • Hanssen I; Scientia Terrae Research Institute, Sint-Katelijne-Waver, Belgium.
  • Raaijmakers JM; Scientia Terrae Research Institute, Sint-Katelijne-Waver, Belgium.
  • Carrión VJ; R&D Department, DCM nv, Grobbendonk, Belgium.
Appl Environ Microbiol ; 84(22)2018 11 15.
Article en En | MEDLINE | ID: mdl-30194105
ABSTRACT
Volatile compounds produced by plant-associated microorganisms represent a diverse resource to promote plant growth and health. Here, we investigated the effect of volatiles from root-associated Microbacterium species on plant growth and development. Volatiles of eight strains induced significant increases in shoot and root biomass of Arabidopsis but differed in their effects on root architecture. Microbacterium strain EC8 also enhanced root and shoot biomass of lettuce and tomato. Biomass increases were also observed for plants exposed only briefly to volatiles from EC8 prior to transplantation of the seedlings to soil. These results indicate that volatiles from EC8 can prime plants for growth promotion without direct and prolonged contact. We further showed that the induction of plant growth promotion is tissue specific; that is, exposure of roots to volatiles from EC8 led to an increase in plant biomass, whereas shoot exposure resulted in no or less growth promotion. Gas chromatography-quadrupole time of flight mass spectometry (GC-QTOF-MS) analysis revealed that EC8 produces a wide array of sulfur-containing compounds, as well as ketones. Bioassays with synthetic sulfur volatile compounds revealed that the plant growth response to dimethyl trisulfide was concentration-dependent, with a significant increase in shoot weight at 1 µM and negative effects on plant biomass at concentrations higher than 1 mM. Genome-wide transcriptome analysis of volatile-exposed Arabidopsis seedlings showed upregulation of genes involved in assimilation and transport of sulfate and nitrate. Collectively, these results show that root-associated Microbacterium primes plants, via the roots, for growth promotion, most likely via modulation of sulfur and nitrogen metabolism.IMPORTANCE In the past decade, various studies have described the effects of microbial volatiles on other (micro)organisms in vitro, but their broad-spectrum activity in vivo and the mechanisms underlying volatile-mediated plant growth promotion have not been addressed in detail. Here, we revealed that volatiles from root-associated bacteria of the genus Microbacterium can enhance the growth of different plant species and can prime plants for growth promotion without direct and prolonged contact between the bacterium and the plant. Collectively, these results provide new opportunities for sustainable agriculture and horticulture by exposing roots of plants only briefly to a specific blend of microbial volatile compounds prior to transplantation of the seedlings to the greenhouse or field. This strategy has no need for large-scale introduction or root colonization and survival of the microbial inoculant.
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Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Compuestos de Azufre / Actinobacteria / Arabidopsis / Solanum lycopersicum / Lactuca / Compuestos Orgánicos Volátiles Tipo de estudio: Risk_factors_studies Idioma: En Revista: Appl Environ Microbiol Año: 2018 Tipo del documento: Article País de afiliación: Países Bajos

Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Compuestos de Azufre / Actinobacteria / Arabidopsis / Solanum lycopersicum / Lactuca / Compuestos Orgánicos Volátiles Tipo de estudio: Risk_factors_studies Idioma: En Revista: Appl Environ Microbiol Año: 2018 Tipo del documento: Article País de afiliación: Países Bajos