Auxin secretion by Bacillus amyloliquefaciens FZB42 both stimulates root exudation and limits phosphorus uptake in Triticum aestivum

Peter J. Talboys; Darren W. Owen; John R. Healey; Paul J. A. Withers; David L. Jones

doi:10.1186/1471-2229-14-51

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Auxin secretion by Bacillus amyloliquefaciens FZB42 both stimulates root exudation and limits phosphorus uptake in Triticum aestivum

Journal article

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Auxin secretion by Bacillus amyloliquefaciens FZB42 both stimulates root exudation and limits phosphorus uptake in Triticum aestivum

Peter J. Talboys, Darren W. Owen, John R. Healey, Paul J. A. Withers and David L. Jones

BMC plant biology, Vol.14(1), 51

2014

DOI: https://doi.org/10.1186/1471-2229-14-51

PMCID: PMC4015440

PMID: 24558978

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Abstract

Life Sciences & Biomedicine

Plant Sciences

Science & Technology

Background: The use of auxin-producing rhizosphere bacteria as agricultural products promises increased root production and therefore greater phosphate (Pi) uptake. Whilst such bacteria promote root production in vitro, the nature of the bacteria-plant interaction in live soil, particularly concerning any effects on nutrient uptake, are not known. This study uses Bacillus amyloliquefaciens FZB42, an auxin-producing rhizobacterium, as a dressing on Triticum aestivum seeds. It then examines the effects on root production, Pi uptake, Pi-related gene expression and organic carbon (C) exudation. Results: Seed treatment with B. amyloliquefaciens FZB42 increased root production at low environmental Pi concentrations, but significantly repressed root Pi uptake. This coincided with an auxin-mediated reduction in expression of the Pi transporters TaPHT1.8 and TaPHT1.10. Applied exogenous auxin also triggered an increase in root C exudation. At high external Pi concentrations, root production was promoted by B. amyloliquefaciens FZB42, but Pi uptake was unaffected. Conclusions: We conclude that, alongside promoting root production, auxin biosynthesis by B. amyloliquefaciens FZB42 both re-models Pi transporter expression and elevates organic C exudation. This shows the potential importance of rhizobacterial-derived auxin following colonisation of root surfaces, and the nature of this bacteria-plant interaction in soil.

Details

Title: Auxin secretion by Bacillus amyloliquefaciens FZB42 both stimulates root exudation and limits phosphorus uptake in Triticum aestivum
Authors/Creators: Peter J. Talboys - Bangor University
Darren W. Owen - Bangor University
John R. Healey - Bangor University
Paul J. A. Withers - Bangor University
David L. Jones - Bangor University
Publication Details: BMC plant biology, Vol.14(1), 51
Publisher: Springer Nature
Number of pages: 9
Grant note: Department for Environment Food and Rural Affairs; Department for Environment, Food & Rural Affairs (DEFRA) LK09136 / Scottish Government under the Sustainable Arable LINK project Biotechnological and Biological Sciences Research Council; UK Research & Innovation (UKRI); Biotechnology and Biological Sciences Research Council (BBSRC)
Identifiers: 991005560442407891
Murdoch Affiliation: Centre for Sustainable Farming Systems
Language: English
Resource Type: Journal article

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Citation topics: 3 Agriculture, Environment & Ecology; 3.97 Plant Pathology; 3.97.556 Microbial Biocontrol
Web Of Science research areas: Plant Sciences
ESI research areas: Plant & Animal Science