Copolymers enhance selective bacterial community colonization for potential root zone applications

Vy T.H. Pham, Pandiyan Murugaraj, Falko Mathes, Boon K. Tan, Vi Khanh Truong, Daniel V. Murphy, David E. Mainwaring

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Managing the impact of anthropogenic and climate induced stress on plant growth remains a challenge. Here we show that polymeric hydrogels, which maintain their hydrous state, can be designed to exploit functional interactions with soil microorganisms. This microbial enhancement may mitigate biotic and abiotic stresses limiting productivity. The presence of mannan chains within synthetic polyacrylic acid (PAA) enhanced the dynamics and selectivity of bacterial ingress in model microbial systems and soil microcosms. Pseudomonas fluorescens exhibiting high mannan binding adhesins showed higher ingress and localised microcolonies throughout the polymeric network. In contrast, ingress of Bacillus subtilis, lacking adhesins, was unaltered by mannan showing motility comparable to bulk liquids. Incubation within microcosms of an agricultural soil yielded hydrogel populations significantly increased from the corresponding soil. Bacterial diversity was markedly higher in mannan containing hydrogels compared to both control polymer and soil, indicating enhanced selectivity towards microbial families that contain plant beneficial species. Here we propose functional polymers applied to the potential root zone which can positively influence rhizobacteria colonization and potentially plant growth as a new approach to stress tolerance.

Original languageEnglish
Article number15902
Number of pages11
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 2017
Externally publishedYes

Bibliographical note

Funding Information:
We thank the Commonwealth Cooperative Research Centre for Polymers, BASF SE and the Australian Grains Research and Development Corporation for their support of the programs on polymers in agriculture. Associate Professor Peta Clode and Dr. Jeremy Bougoure from The University of Western Australia are thanked for supplying the SEM images.

Publisher Copyright:
© 2017 The Author(s).

Keywords

  • Copolymers
  • anthropogenic
  • climate
  • stress
  • plant
  • growth
  • soil
  • microorganisms
  • polymeric
  • hydrogels
  • microbial
  • biotic
  • abiotic
  • mannan
  • chains
  • synthetic polyacrylic acid
  • Pseudomonas fluorescens
  • Bacillus subtilis
  • agricultural

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