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Silica Particles Trigger the Exopolysaccharide Production of Harsh Environment Isolates of Growth-Promoting Rhizobacteria and Increase Their Ability to Enhance Wheat Biomass in Drought-Stressed Soils

Fetsiukh, Anastasiia and Conrad, Julian and Bergquist, Jonas and Timmusk, Salme (2021). Silica Particles Trigger the Exopolysaccharide Production of Harsh Environment Isolates of Growth-Promoting Rhizobacteria and Increase Their Ability to Enhance Wheat Biomass in Drought-Stressed Soils. International Journal of Molecular Sciences. 22 , 6201
[Research article]

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Abstract

In coming decades, drought is expected to expand globally owing to increased evaporation and reduced rainfall. Understanding, predicting, and controlling crop plants' rhizosphere has the potential to manipulate its responses to environmental stress. Our plant growth-promoting rhizobacteria (PGPR) are isolated from a natural laboratory, 'The Evolution Canyon', Israel, (EC), from the wild progenitors of cereals, where they have been co-habituating with their hosts for long periods of time. The study revealed that commercial TM50 silica particles (SN) triggered the PGPR production of exopolysaccharides (EPS) containing D-glucuronate (D-GA). The increased EPS content increased the PGPR water-holding capacity (WHC) and osmotic pressure of the biofilm matrix, which led to enhanced plant biomass in drought-stressed growth environments. Light- and cryo-electron- microscopic studies showed that, in the presence of silica (SN) particles, bacterial morphology is changed, indicating that SNs are associated with significant reprogramming in bacteria. The findings encourage the development of large-scale methods for isolate formulation with natural silicas that ensure higher WHC and hyperosmolarity under field conditions. Osmotic pressure involvement of holobiont cohabitation is also discussed.

Authors/Creators:Fetsiukh, Anastasiia and Conrad, Julian and Bergquist, Jonas and Timmusk, Salme
Title:Silica Particles Trigger the Exopolysaccharide Production of Harsh Environment Isolates of Growth-Promoting Rhizobacteria and Increase Their Ability to Enhance Wheat Biomass in Drought-Stressed Soils
Series Name/Journal:International Journal of Molecular Sciences
Year of publishing :2021
Volume:22
Article number:6201
Number of Pages:15
Publisher:MDPI
ISSN:1661-6596
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Keywords:plant drought stress tolerance, harsh habitat isolates, silica nanoparticles, exopolysaccharides, D-glucuronate (D-GA), hyperosmolarity, MALDI-TOF
URN:NBN:urn:nbn:se:slu:epsilon-p-112914
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112914
Additional ID:
Type of IDID
DOI10.3390/ijms22126201
Web of Science (WoS)000667365600001
ID Code:24909
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Deposited By: SLUpub Connector
Deposited On:16 Aug 2021 14:27
Metadata Last Modified:16 Aug 2021 14:31

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